A 4-year-old female cat was examined by blood biochemistry. The results showed that ALT was 436 u/L, ALKP was 249 u/L, TBIL was 88 μmol/L, which was higher than the normal value. Combined with the digestive tract symptoms such as fever, depression, loss of appetite, vomiting and severe jaundice, the cat was diagnosed as liver failure. According to the clinical symptoms and the results of hematological tests, the cat was treated with a comprehensive treatment for more than a month. The results showed that the values of ALT, ALKP and TBIL all reached normal values, and the cat’s diet and defecation were normal, indicating that the cat had basically recovered. The follow-up report of this case can provide reference for clinical diagnosis and treatment of pets.

With the expansion of the scale of the cultivation of sea cucumber, many problems in the cultivation gradually become prominent. In the process of sea cucumber cultivation, pollutants such as residual bait excrement and other pollutants produce toxic ammonia nitrogen and nitrite, which can lead to the decline of water quality and seriously reduce the yield of sea cucumber. The disease caused by pathogenic microorganism directly threatens the economic benefit of aquaculture. Despite the strengthening of fishery resources and environmental protection, the disease of sea cucumber breeding still occurs frequently, and the disease is mainly traced back to microorganisms. Therefore, this paper summarized the formation and host regulation of intestinal microorganisms of sea cucumber, and introduced the early colonization, function and regulation of intestinal microorganisms, providing a reference for understanding the formation mechanism of intestinal microorganisms of sea cucumber as well as the prevention and treatment of related diseases.

In order to study the growth status of different lily varieties under organic ecological mixed substrate culture technology, the experiment was designed as a single-factor randomized block test, in which the single factor was lily variety. There were five treatments in the experiment, including Lilium lancifolium Thunb, the longya lily, the lanzhou lily, longiflorum, Lilium casa blanca. At last, 12 indicators were measured, including plant height, stem diameter, leaf number, leaf length and leaf width of lily above ground, weight, volume, tiller number, overall transverse and longitudinal diameters, single transverse and longitudinal diameters, peroxidase （POD） activity and catalase （CAT） activity. The results showed that Lilium lancifolium Thunb. had the largest number of leaves, the largest weight and volume of bulbs, the largest number of tillers, and the highest CAT activity, and other indicators were also strong. Therefore, Lilium lancifolium Thunb had a better growth condition under mixed substrate cultivation, and its compatibility with mixed substrate cultivation technology was higher.

In order to understand the difference of leaf anatomical structure and its salt tolerance on the saline-alkali land, leaf anatomical structures of North American crabapple varieties such as ‘Donghong’, ‘Wumei’, ‘Adam’, ‘Xiyangyang’ ‘Guandian’ ‘Royal’ ‘Kells’and ‘Ruby’were analyzed. The results showed that the highest stomatal density was on the blade of ‘Wumei’（101.593 pieces/mm ²）; the guard cell area of Kells（0.112 mm ²）was the largest; the guard cell transverse diameter of ‘Adam’（8.289 μm）was the longest; the guard cell longitudinal diameter of ‘Adam’（37.857 μm）was the longest; ‘Guardian’（0.4）had the highest aspect ratio of guard cells. The salt-tolerance of ‘Kells’（0.969）was the strongest, followed by ‘Adam’（0.789）, ‘Donghong’（0.688）, ‘Royal’（0.606）, ‘Guardian’（0.543）, ‘Xiyangyang’（0.498）, ‘Ruby’（0.413）and ‘Wumei’（0.064）according to comprehensive analysis of membership functions.

In this study, G1614 was used as plant materials. The effects of different concentrations of 2,4-D, different kinds and concentrations of carbon source, and different cutting ways to mature embryos on the callus induction of mature embryos from barley G1614 were studied with MS medium as basic medium. And the effects of different concentrations of KT and NAA on the differentiation of barley callus were also studied. The results showed that inducing rate of callus were higher at 5 mg/L 2,4-D. Callus induction rate of mature barley embryos using 30 g/L sucrose as carbon source was higher. The induction rate of barley callus was promoted by longitudinal cut of mature embryo. The addition of 0.5 mg/L NAA and 4.0 mg/L KT in the differentiation medium resulted in a higher differentiation rate of G1614 callus.

In order to compare the differences of fruit quality among three new late-ripening peach varieties in saline-alkali soils of Tianjin, the quality（fruit hardness, fruit shape index, single fruit weight, water content, soluble solid, soluble sugar, titratable acid, sugar-acid ratio, vitamin C）of ‘Guoqingtaowang’, ‘Juhongguan’, ‘Guhuangjin’varieties were researched, and then analyzed by membership function. The results showed that single fruit weight, soluble solid, soluble sugar, sugar-acid ratio and vitamin C were highest in ‘Juhongguan’, and ‘Guhuang Jin’ were lowest, but fruit shape index, water content, fruit hardness and titratable acid were highest in it. In conclusion, the fruit quality was high in ‘Juhongguan’, middle in ‘Guoqingtaowang’, low in ‘Guhuangjin’.

In order to evaluate the effects of phosphorus-efficient transgenic rice cultivation on soil microbial functional diversity, the plot experiment was conducted with phosphorus-efficient transgenic rice as a target, and with both phosphorus and non-phosphorus treatments , to analyze and compare the effects of phosphorus-efficient transgenic rice and non transgenic rice on soil microbial functional diversity at different growth stages based on the Biolog eco-plate method. The results showed that the average absorbance value AWCD of soil microflora in OsPT4 and Nipponbare had the same change trend, which all increased with the prolongation of culture time, but the maximum value and rate of change of AWCD in different growth stages were different. The results of soil microbial diversity index analysis showed that the phosphorus-efficient transgenic OsPT4 and Nipponbare Shannon's richness index and Simpson dominance index showed higher in P application than no P application during the whole growth period; Shannon index of OsPT4 with high P transgenic rice in the tillering and jointing stages, the differences were significant, and the heading and flowering stages were not significantly different from the maturation stage. The Simpson index showed no significant difference in the first three growth stages, but showed a significant difference in the mature stage. McIntosh's index of phosphorus efficient transgenic rice OsPT4 and Nipponbare was the highest in the tillering period, and the value was much higher than the other three growth periods; the McIntosh index of the phosphorus-efficient transgenic OsPT4 rice had no significant difference in the whole growth period. The use of different types of carbon sources to display phosphorus-efficient transgenic rice OsPT4 and Nipponbare are mainly by sugars, carboxylic acids, and amino acids. The principal component analysis showed that Nipponbare was clustered and the phosphorus-efficient transgenic rice OsPT4 was distributed, indicating that there was a difference in the metabolic use of the soil microbial community carbon sources. In summary, compared with the non-transgenic rice, the phosphorus-efficient rice OsPT4 will affect the soil microbial community richness index, dominance index, and the distribution of carbon source principal components due to different phosphorus application conditions and different growth periods.

To explore the morphological characteristics of different blueberry flowers and provide theoretical basis for the classification and identification and cultivation of blueberry species, in this study, Nikon SMZ25 stereoscopic microscope was used to observe the flower organs of 7 varieties of ‘Bluecrop’ ‘Brigitta’ ‘Legacy’ ‘Northland’ ‘Berkeley’ ‘Bluegold’ ‘O’ Neill’ and the pollen content of blueberry was determined by cellulase digestion method. The results showed that: single flower length, sepals length, petal length, flower stalk length, corolla diameter, filament length, anthers length, style height, stamen number, pollen grain number of different varieties of blueberry all had significant differences. The flowers of ‘Berkeley’ ‘Brigitta’ ‘Legacy’ were the largest, and that of ‘Northland’ was the smallest; the single flower, corolla diameter, flower length, flower medicine of ‘Berkeley’ was the largest while ‘Northland’ is the smallest ; the sepals, long petals, and long flowers of ‘Brigitta’ was the largest; the handle of ‘Legacy’ was the longest, and the stamens was the least; the stamens of ‘Bluecrop’ was the most; the species with the most pollen grains was ‘Brigitta’（254.9 grain/anther）, while the least was ‘Bluegold’（166.7 grain/anther）.

As cities grow faster, people have higher requirements for greening, not only to reduce costs but also to reduce floor space, and thus vertical greening soilless cultivation techniques came into being. In this experiment, four kinds of light culture substrates with different proportions were prepared to grow Pharbitis nil（L.）Choisy. By regularly measuring the plant height, chlorophyll content and nitrogen content of the leaves, comparing the physicochemical properties and fertilizer supply of the four culture substrates, the light culture substrate which is most suitable for the growth of Pharbitis nil was screened out. The test results showed that the bulk density of the four vertical greening substrates varied from 0.42 to 0.57 g/cm ³; the saturated water retention, capillary porosity and total porosity of J4 matrix were the highest（The volume ratio of peat, earthworm dung, vermiculite, mushroom residue fertilizer is 0.5∶0.5∶2.0∶1.0）; The plant height, chlorophyll content and nitrogen content of the leaves in the J4 matrix were the highest.

In this paper, we investigated the effects of medicinal plants on salt ions in saline soil by growing Semen coicis, Glycyrrhiza uralensis Fisch , Carthamus tinctorius L ., Cichorium intybus and Pennisetum alopecuroides in soils that contain different concentrations of NaCl. The suitable medicinal plants for soils that were salinized to various degrees were sorted out by monitoring the change of anions and cations in the soil. The results showed that medicinal plants could decrease the amount of water-soluble Na ⁺ in saline soil, and the five medicinal plants possessed comparable ability in reducing soil water-soluble Na ⁺. Apart from Semen coicis, other medicinal plants could also reduce the content of water-soluble K ⁺ in the soil, with Carthamus tinctorius L. and Cichorium intybus being the most effective ones. Those five medicinal plants reduced water soluble Ca ²⁺ and Mg ²⁺as well. The addition of NaCl in soil not only increased the concentration of Cl ^- , but also increased the content of HCO ₃ ^- and SO ₄ ^2-. The amount of those three water-soluble anions increased as the concentration of NaCl rose. All the medicinal plants decreae the content of water-soluble Cl ^- and SO ₄ ^2-for soils under NaCl treatment. Among them, Cichorium intybus was the best reducing the water-soluble Cl ^-, while Glycyrrhiza uralensis Fisch is was the most effective one in decreasing water-soluble SO ₄ ^2-. Those five medicinal plants also successfully reduced water-soluble HCO ₃ ^- content in soil with high NaCl treatment.

Both methods of ZT sterilized by high temperature and ZT sterilized by filteringwere respectively done inmaking media for blueberry plantlet in vitro proliferation to research on the effect of the sterilizing method on ZT function. The stem sections of blueberry plantlet in vitro were respectively inoculated in WPM media containing different concentration of ZT for shoot proliferation. The results showed that with the ZT concentration of 1.0 mg/L or 2.0 mg/L there were no significant difference in coefficient of multiplication of blueberry plantlet in vitro between methods of ZT sterilized by high temperature and ZT sterilized by filtering, and sterilizing with high temperature had no obvious unfavorable effect on ZT function. For blueberry varieties（‘Bluecrop’‘Northland’and‘Patriot’） the treatment of 0.5 mg/L ZT obtained the higher coefficient of multiplication among ZT concentration of 0.5-3.0 mg/L, and then the suitable multiplication medium for the three blueberry varieties was WPM+ZT 0.5 mg/L.

In order to compare nutrient of fruits in different varieties of raspberries（‘Hongbao’ ‘Nova’ ‘Xiangfei’ and ‘Heritage’）in saline soil of Tianjin, Vc, soluble protein, total polyphenols, flavonoids, anthocyanins, Na, K, Fe, zinc and mineral salts, the content of Ca, Cu, etc were detected. The results showed that the highest Vc content was 15.12 mg/100g in ftuits of ‘Hongbao’, which was not significantly different from that of Xiangfei（13.68 mg/100g）and Heritage（12.72 mg/100g）, but significantly higher than that of ‘Nova’（4.80 mg/100g）. The soluble protein content of ‘Xiangfei’ was the most（10.73 μg/g）in all of them, which was not significantly different from that of ‘Nova’（10.24 μg/g）and ‘Hongbao’（10.05 μg/g）, but it was significantly higher than that of ‘Heritage’（9.40 μg/g）. The total phenol, flavonoids, anthocyanin, Na, Fe, Zn, Ca, and Cu of ‘Hongbao’ were also the highest, respectively: 93.30 μg/g、15.00 μg/g、20.60 μg/g、7.39 mg/100g、6.23 mg/100g、0.18 mg/100g and 0.02 mg/100g. The fruit health nutrition of Hongbao is the highest, since its function value is 0.86, followed by ‘Xiangfei’（0.49）, ‘Heritage’（0.35）and ‘Nova’（0.30）on the basis of membership function analysis results.

In order to understand growth differences of different blueberry cultivars between plastic greenhouses and artificial heating greenhouse, the growth and physiological indexes of four varieties of blueberry（‘Bluecorp’ ‘Berkeley’ ‘Laikexy’ ‘ Brigitta’）were analyzed. The results showed that the indexes of ‘Berkeley’ were the highest in the artificial heating greenhouse, including the longest new shoot, the thickest stem, the largest leaf area of single plant, the highest content of chlorophyll a, b, and carotenoids. ‘Laikexy’ possessed the shortest shoots, the thinnest stem, the smallest leaf area and the thickest blade. In the plastic greenhouse, the longest shoots, the thickest blade, the largest leaf area of single plant belonged to ‘Berkeley’. The new shoot of ‘Laikexy’ was shortest, and its content of Chlorophyll A, B, and carotenoids of ‘Brigitta’ was the lowest. To sum up, the blueberry plants grow better in heating greenhouses, with ‘Berkeley’ best suitable for cultivation in greenhouse.

In order to compare the differences of fruit external quality among different blueberry varieties under the forcing cultivation in greenhouse, the external quality（fruit color, fruit hardness, fruit shape index, single fruit weight, peduncle length）of ten blueberry varieties were researched. The results showed that brightness index（89.56）, yellow-blue chromaticity（-0.44）were the highest in‘Bluecrop’; red-green chromaticity（0.57）was the highest in‘Northland’and‘O’Neal’; fruit hardness（1 660.25 g/cm ²）, fruit shape index（1.60）were the highest in‘Darrow’; single fruit weight（3.61 g）, peduncle length（1.42 cm）were the highest in‘Berkeley’. In conclusion, the fruit external quality of‘Berkeley’among the different blueberry varieties was the best, followed by,‘Spartan’‘Brigitta’and‘Duke’‘Darrow’‘Bluegold Ⅱ’‘Bluecrop’and‘O’Neal’‘Northland’and‘Bluegold І’.

In order to extend the vase life and improve the preservation quality of gerbera cut flowers, 16 kinds of preservatives’ effects on the flower diameter change of gerbera fresh cut flowers, vase life and bottle insertion viewing values were studied with ‘Travisa’ gerbera variety as an example by adding 0,0.2,0.4,0.6 mL detergent in 100 mL preservative solution and 0,15,30,45 mL of fresh orange juice cross combination, and adding 1% NaCl and 3% white sugar mixed solution. The results showed that the treatment with the juice content of 300 ml/L could delay the opening of the cut flower, and the fresh-keeping effect was better. Under the condition of the same juice content, the fresh-keeping effect of edetergent of 0.4 mL/L was better than that of 0,2 and 6 mL/L. Treatment with 300 mL/L of juice+4 mL/L detergent+1% salt solution+3% sugar solution was the most beneficial to improve the fresh-keeping effect of fresh cut flowers, and was an ideal home-made preservative.

In order to understand the salinity tolerance of colored leaf trees, the four growth indexes and their growth characteristics were researched with 6 varieties Sophora japonica cv. Golden Stem, Ulmus pumila cv. Jinye, Prunus cerasifera, Prunus×Cistena Pissardii, Amygdalus persica f. atropurpurea, Ailanthus altissima. The results showed that the best growth was Ulmus pumila cv. Jinye on the non-saline soil, and the growth of the Prunus cerasifera was the worst. On the mild saline-alkali soil, the best growth was the Ulmus pumila cv. Jinye and the Sophora japonica cv. Golden Stem, while the Prunus cerasifera was the worst growth. On the saline-alkali ground: the best growth is the Ulmus pumila cv. Jinye and the Sophora japonica cv. Golden Stem, while the Prunus cerasifer dwarf cherry had the worst growth, which is consistent with the mild saline-alkali land. The comprehensive membership function analysis showed that the adaptability of different kinds of colorful leaf plants on non-salt-alkali soils, mild saline-alkali soils and moderate saline-alkali soils was Sophora japonica cv. Golden Stem> Ulmus pumila cv. Jinye> Amygdalus persica f. atropurpurea> Prunus cerasifera> Ailanthus altissima> Prunus×Cistena Pissardii.

In order to compare the fruit quality of ‘red globe’ grapes from different producing areas, the single fruit weight, fruit shape index, soluble solids, titratable acid, vitamin C, soluble sugar and sugar-acid ratio of ‘red globe’ grapes from three producing areas（Peru, China and the United States）were determined, and the membership function was analyzed comprehensively. The results showed that China ‘red globe’ grape fruit was the highest in the fruit shape index（1.31）, soluble solid content（10.37%）, soluble sugar content（10.37%）and sugar-acid ratio（51.85）, and the lowest in titratable acid content（0.20%）; the Peru ‘red globe’ grape fruit was the highest in vitamin C（3.16 mg/100g）, but the lowest in the soluble solid（15.57%）, the sugar to acid ratio（23.66）, and highest in the titratable acid content（0.385%）; The United States ‘red globe’ grape fruit was the largest in single fruit weight（14.87 g）. Comprehensive analysis showed that the quality of ‘red globe’ grape fruit: Chinese>American>Peruvian.

“ Analog Electronic Technology” is a required professional basic course in the sophomore year for Programs of Measurement & Control Technology and Instrument in our university. To do ideological and political work of this course well has a great impact on the students’ thoughts. Since this course not only has deep theory with many concepts and devices, but also needs strong practice, this paper proposed that the ideological and political content should combine with this course, and illustrated how to implement ideological and political education in this course through specific examples. Through one-year teaching practice, students’ interest in this course has increased after they received ideological and political education, with learning goals clearer, and test scores are improved significantly.

The problem of soil quality degradation in northern farmland was prominent, which restricted the sustainable development of modern agriculture. This experiment proposed to use humic acid, biochar, alum and silicon calcium materials as soil conditioner materials in the northern winter wheat-summer corn planting area, and designed T1（control）, T2（humic acid）, T3（biochar）, T4（alum）, T5（silicon calcium material）, T6（biochar+alum）, T7（humic acid+biochar+alum）7 treatments positioning test in three planting season crops. The results showed that biochar treatment had the best effect on summer maize yield increase and nitrogen, phosphorus and potassium nutrient uptake, followed by biochar+alum treatment. From the perspective of economic benefits, the early T2 and T5 treatments were better, and the late T3 and T6 treatments performed well. Comprehensive considering crop yield, nutrient uptake and economic benefits, T3（biochar）and T6（biochar+alum）were more effective.

With the rapid development of large-scale and intensive livestock and poultry industry in China, a large number of veterinary antibiotics are widely used in animal breeding. Antibiotics cannot be fully absorbed by animals, resulting in high concentrations of antibiotics in animal manures and posing a great threat to the ecological environment and human health. This paper reviewed the distribution characteristics and removal methods of four kinds of antibiotics （Tetracyclines, Fluoroquinolones, Sulfonamides and Macrolides） in livestock and poultry feces. The effects of different methods on the removal of antibiotics were compared to propose suggestions for the control of residual antibiotics in livestock and poultry manure.

Cinnamaldehyde is the main active component of Cinnamomum cassia Presl, which has been studied and applied widely in terrestrial animals, but little in aquatic animals. This paper summarized the current embedding method of cinnamaldehyde and application in the aspects of anti-bacterial, anti-insect, food attraction and preservation of aquatic products, in order to provide reference for the research and application of cinnamaldehyde in aquatic animal health breeding and aquatic product preservation.

In order to compare the suitable varieties of colorful leaf tree for cultivation in severe saline-alkali soils, the soluble protein, soluble sugar, free proline, malondialdehyde content, membrane permeability, SOD, POD enzyme activity and other physiological and biochemical indexes in leaves were determined with six varieties（Zi Ye Li, Zi Ye Ai Ying, Jin Ye Yu, Jin Ye Huai, Hong Ye Chou Chun, Hong Ye Bi Tao）from 5 regions of Binhai in Tianjin. The results showed that SOD activity in Jin Ye Yu was the highest; POD enzyme activity in Jin Ye Yu was the highest; the malondialdehyde content in Jin Ye Huai and Jin Ye Yu was the lowest;the content of soluble protein and free proline content and SOD activity in Zi Ye Li was the lowest; the malondialdehyde content in Zi Ye Ai Ying was the highest; the content of soluble protein and soluble sugar and POD enzyme activity in Zi Ye Ai Ying was the lowest; the content of free proline in Hong Ye Bi Tao was the highest;the content of soluble sugar and the soluble proline in Hong Ye Chou Chun was the highest. In conclusion, the growth characteristics of the colorful leaf trees from strong to weak was that of Jin Ye Yu and Jin Ye Huai, Hong Ye Bi Tao and Hong Ye Chou Chun, Zi Ye Li, and Zi Ye Ai Ying.

During the epidemic of novel coronavirus pneumonia, schools were closed, and online teaching became the only option for students to study. However, after a period of operation, online teaching has shown some main problems: network hardware affecting the quality of online teaching, user information processing affecting the effect of information transmission, difficulty in maintaining the order of online teaching environment, and network teaching effect’s depending on students’ self-discipline. In view of the problems of online teaching, this paper puts forward the corresponding countermeasures to provide reference for further improving the network teaching.

In order to solve the problem of Fe-deficient chlorosis of blueberry in production,the changes of chlorophyll a, chlorophyll b, carotenoid and ratio of chlorophyll to carotenoid of two blueberry varieties（‘Bluecrop’ and ‘Bluegold’）were obtainedafter fertilizing fertilizer, which included spraying on leaves with ferrous sulfate, citric acid and ferrous sulfate, iron chelate（EDTA-Fe）and fertilizing ferrous sulfate in soil. The resultsshowedthe effect of EDTA - Fe or mixture of citric acid and ferrous sulfate by spraying on the leaves>ferrous sulfate by spraying on the leaves>using ferrous sulfate in soil>CK, according to the chlorophyll b, carotene and ratio of chlorophyll and carotene in leaves. Apparent regular wasn’ t found in chlorophyll a. The increment of chlorophyll b in blueberry leaves was the bestby using iron fertilizer. The effect of spraying on leaves was better than fertilizing in soil. At the same time, the increment of photosynthetic pigment in blueberry leaves was the biggest by spraying EDTA-Fe on leaves.

In order to understand the difference of petiole anatomical structure of north American crabapple and its salt and drought tolerance on the saline-alkali land, north American crabapple varieties such as ‘Donghong’‘Wumei’‘Adam’ and ‘Xiyangyang’ were used as research objects to analyze their anatomical structures. The results showed that the petiole of ‘Xuan li’（7.57 μm）was the thickest in the cuticle, and ‘Wumei’ the thinnest（5.12 μm）; the phloem thickness of the petiole of ‘Adam’（426.05 μm）was the largest, and that of ruby（312.47 μm）was the smallest; .The xylem of ‘Adam’（416.28 μm）was the largest and ‘Ruby’（267.00 μm）was the smallest; ‘Donghong’（415.10）had the largest number of xylem and ‘Wumei’（333.45）had the smallest. Comprehensive analysis of membership functions showedthat the drought-tolerance and salt-tolerance upper Adam（0.784 μm）‘Xuanli’（0.757 μm）and Dongahong（0.721 μm）were the strongest, followed by ‘Kells’（0.650 μm）, ‘Royal’（0.371 μm）and ‘Xiyangyang’（0.328 μm）; ‘Wumei’（0.078 μm）and ‘Ruby’（0.025 μm）were the worst．

To make good use of the main channel of classroom teaching, ensure that all courses and ideological and political theory courses in colleges and universities go in the same direction, form a synergistic effect, and achieve the goal of“three- whole”education, the construction of ideological and political courses in colleges and universities is in the ascendant. In the process of ideological and political construction of Rural Sociology course, the author explored the path of adding ideological and political elements into the course construction: integrating ideological and political elements into the syllabus, teaching plan, teaching courseware and other teaching documents. In addition, according to the specific content of ideological and political elements in the classroom teaching, the author adopted different teaching methods, such as case method, comparative analysis method and heuristic teaching method. In the process of ideological and political construction of“rural sociology”course, the author also encountered some new problems to be solved in the subsequent teaching reform, including the systematic design of teaching and learning of the Rural Sociology course on the ideological and political education, the benign and effective interaction between teachers and students, and so on.

In order to study the effect of carp（ Cyprinus carpio）on the phytoplankton community structure and water quality in paddy field, the phytoplankton and environment factors of trial group（rice-carp coculture）and control group（rice-monoculture）were studied. The results showed that there were 18 species belonged to 7 phylums in the trial group and 24 species belonged to 5 phylums in the control group, and the density and biomass of phytoplankton in the trial group were significantly higher than those in the control group（ P<0.05）. There were 11 dominant species in the trial group, concentrated in Chlorophyta and Bacillariophyta, and 13 dominant species in the control group, concentrated in Cyanophyta and Bacillariophyta. The indexes of Shannon-Weiner and Margalef indicated that the phytoplankton diversity of the rice-carp-coculture mode was lower than that of rice-monoculture mode（ P<0.05）. There was no significant difference in ammonia nitrogen and nitrite between the trial group and the control group（ P>0.05）, but the nitrate, total nitrogen of water（WTN）and COD was significantly lower than those of the control group（ P<0.05）. The results showed that the phytoplankton community structure and water quality of paddy fields had been improved after the addition of carp.

The four-year and five-year professional training programs of veterinary medicine among Chinese Agricultural University, Jilin University and Henan Agricultural University were selected, in order to analyze the differences in training objectives, setting of credits and class hours, as well as the setting of practical teaching. This paper discussed on the professional curriculum setting, comprehensive experiments and practical teaching, and put forward the idea of “3+2+1” for five-year training of veterinary medicine in Henan Agricultural University. It will provide the basis for formulating the five-year professional training program of veterinary medicine in agricultural colleges and universities in Henan.

In order to study the relationship between grape cracking fruit and variety and water content, four varieties including ‘Red Globe’‘Wink’‘Italia’and‘Muscat Hamburg’were used as materials to observe the weight change and fruit cracking of the grapes under the condition of 0~60 h immersion. The results showed that the water absorption rate of‘Italia’was 7.89%, and the water absorption rates of‘Red Globe’‘Wink’and‘Muscat Hamburg’were between 2.50% and 3.24%;at the same time the water absorption rates and time of‘Red Globe’‘Wink’and‘Italia’increased first and then decreased. The water absorption rate of‘Muscat Hamburg’fruit in the early stage was higher, and the water absorption rate did not change much with time.‘Red Globe’（50%）and‘Italia’（50%）had significantly higher rates of fruit cracking than‘Wink’（25%）and‘Muscat Hamburg’（25%）and the growth rate of‘Red Globe’cracking rate in the early stage was the highest. The water absorption rate and fruit cracking rate of‘Red Globe’‘Wink’‘Italia’and‘Muscat Hamburg’were all significantly positively correlated, and the‘Red Globe’cracking rate increased the fastest with the growth of water absorption rate.

In order to explore the effect of organic fertilizer instead of chemical fertilizer on the growth and quality of tomato in greenhouse, by four kinds of fertilization treatments, conventional fertilization, organic fertilizer instead of 10%, 20% and 30% fertilizer treatment, the growth and quality of tomato in greenhouse were studied. The results showed that the effect of organic fertilizer instead of chemical fertilizer on tomato plant height was not significant. In the leaves, nitrogen content, chlorophyll content and Vc content, was higher in organic fertilizer replacing 30% chemical fertilizer treatment than other treatments. The nitrate and organic acid in the organic fertilizer instead of 30% fertilizer treatment was lower than other treatments. The content of nitrate and organic acid in tomato fruit decreased but tomato production increased with the increase of organic fertilizer.

Bacillus velezensis, which is a new species of Bacillus, can promote plant growth and inhibit plant pathogens in agriculture and has great potential to be developed as a biocontrol agent. It can also be used in industry to degrade industrial harmful by-products and be widely used in biomedicine.Therefore, it has attracted much attention in recent years. In this paper, the discovery and classification, genome research, biological control and application of B. velezensis were reviewed in order to provide reference for further research and development.

The stem sections were taken from new shoots of Prunus cerasifera which grew in field on May 15 ^th and July 9 ^th in 2018 respectively and were sterilized with alcohol and sodium hypochlorite . The sterile stem buds were proliferated on medium containing different concentrations of IBA, rooted in soil supporting medium, and then the plantlet were transplanted. The results showed that there was no obvious difference in the sterilization effect of the samples at different time, and the contamination rate was less than 10% and the germination rate was 100%. There was no obvious different effects between washing and no-washing by sterilized water after soaked in alcohol on sterilization. The propagation coefficient of the plantlet of Prunus cerasifera was 4.2 in 1/2MS medium added with 0.4 mg/L IBA when cultured for 60 day. The rooting rate of the plantlet of Prunus cerasifera cultured in soil supporting medium was 68.8%, which was obviously higher than that of the plantlet cultured in agar medium. The survival rate of the plantlet of Prunus cerasifera transplanted in soil supporting medium was 75.0%, which was obviously higher than that of plantlet in agar medium（33.3%）. These results can provide basis for improving rapid propagation technique of Prunus cerasifera.

The quality and palatability characteristics of 22 Japanese rice varieties（origin + cultivation）purchased from Ishidan Mall in Shinjuku, Tokyo, Japan were determined; the relationship between hardness and physicochemical indexes of rice and the relationship between palatability evaluation items and palatability were analyzed. The results showed that the average whiteness of Japanese milled rice samples was 40.0, the length was 4.57 mm, the width was 2.78 mm, the thickness was 1.94 mm, the protein content was 6.14 %, the amylose content was 18.3 %, the hardness was 3.92 kgf, the viscosity was 0.78 kgf and the elasticity was 0.71 kgf. The indices of all milled rice samples were different, but they tended to be stable as a whole. The multiple correlation analysis between the five palatability evaluation items and the comprehensive evaluation showed that the multiple correlation coefficient was 0.834***, which supports that these five palatability evaluation items can be used as the main factors to discriminate the palatability of rice. The contribution rate of appearance, smell, taste, viscosity and hardness to palatability was successively from large to small: taste（44.0%）, appearance（26.5%）, smell（12.2%）, viscosity（10.8%）and hardness（6.5%）, among which the hardness of rice was positively correlated with protein content but negatively correlated with grain thickness.

Chinese excellent traditional culture plays an active role in shaping national spirit, cultivating patriotism, constructing theoretical sources and promoting personal moral quality. In the process of creative transformation and innovative development of traditional culture, we should pay attention to the characteristics of the times, the guiding role of reality and the mode of transformation of traditional culture. We should not only stick to the standpoint of Chinese culture, but also reform, supplement, expand and perfect the connotation and outdated forms of expression of traditional culture in accordance with the characteristics and requirements of the development of the times, so as to enhance its influence and appeal.

To implement the rural revitalization strategy, talents are the key. Through the perfect career planning education and ideological and political guidance, agricultural university students will become the backbone of the rural revitalization strategy. By investigating the status quo of studying and career planning of 575 undergraduate students in Tianjin Agricultural university, this paper analyzed the problems existing in education of career planning of this university, and proposed to implement career planning education in stages from the beginning of the freshman enrollment, to strengthen professional career planning practice education, to design the whole process and professional course system, to establish individualized counseling and consultation platform and to strengthen the effective integration of career education with ideological and political education. It is important to further improve that education for the agricultural university and promote the growth of agricultural university students to serve the rural revitalization strategy.

：In order to study the growth of theNorth American crabapple on mild saline soil, the growth dynamics of annual rings in different yearswere studied with ‘Donghong’ ‘Wumei’ ‘Yadang’ ‘Xiyangyang’ ‘Xuanli’ ‘Kiles’ ‘Royal’ ‘Ruby’.The results showed that the annual average growth rings of ‘Dong Hong’（0.633 cm）was the highest, and the ‘Royal’（0.464 cm）was the lowest. From the growth dynamics of annual growth rings in different years, the average annual growth volume（0.739 cm）in all cultivars in 2015 was the highest, which was increased by 183.85% compared to 2011（0.260 cm）. From the magnitude changes of annual rings in each year, the variation of ‘Donghong’ ‘Wumei’ ‘Xuanli’ and ‘Ruby’ were smaller, while ‘Kiles’ ‘Yadang’ ‘XiYangyang’ and ‘Royal’ had greater fluctuations. Therefore, the comprehensive analysis suggested that ‘DongHong’ was more suitable for the cultivation of mild saline soil.

Nicotinamide is a kind of pyridine derivative, which has various pharmacological effects such as inhibition of melanic transmission, anti-free radical, anti-aging, anti-inflammatory and enhancement of skin barrier after transdermal administration. However, due to its structure of amide, nicotinamide could be oxidized to nicotinic acid, which could cause dermal irritation and side effects. Thus, water-in-oil（W/O）ointment was prepared to enhance stability and compliance of nicotinamide. In this investigation, comprehensive scoring of homogeneity, extensibility, centrifugal stability and cold/heat resistance was set as the evaluation indicator to obtain the optimal proportion of oil phase, emulsifier and coemulsifier through single-factor experiment and orthogonal screening. under the optimal formulation. Span-60 and Tween-80 were used as emulsifier and coemulsifier respectively with the mass percentage of 1%, and the weight ratio of oil to water was 6∶4. Under the selected formulation, storage stability of ointment remained in 3 months under 25 ℃, which provides the basis for practical application.

The leaves of Dendrobium crepidatum tissue culture seedlings were inoculated on MS medium containing different hormones to induce the production of protocorm, and then the protocorm was cultured for proliferation.The results showed that the protocorm induction effect was better on the medium with MS+2.0 mg/L 2,4-D+2.0 mg/L BA+0.5 mg/L NAA, and the induction rate could reach 94%; the protocorm could be induced with fast proliferation, hard texture and loose structure on MS+1.0 mg/L BA+0.2 mg/ L NAA. The results of this experiment can provide some reference for the study of artificial seeds of Dendrobium crepidatum.

In order to determine the timely harvesting period of cherry fruits, the EBF cherry fruits of 4 harvesting periods were regarded as the research objects, and five quality indicators of the EBF cherry fruits in each period were analyzed. The results showed that the hardness and brightness of the fruit with 70% maturity（yellow）was the highest; the fruit with 100% maturity （dark red）was the lowest one; the red-green saturation（a*）of fruit with 80% maturity（pink）was the highest; the fruit with 100% maturity（dark red）had the lowest one; the soluble protein, soluble sugar and Vc of the fruit with 100% maturity（dark red）was the highest, and the fruit with 80% maturity（pink）had the lowest one. According to comprehensive analysis of the index membership function, the quality of the fruit with 70% maturity（yellow）were the best; the second was the fruit with 100% maturity（dark red）; the fruit with 90% maturity（red）and the fruit with 80% maturity（pink）were a little bad. Therefore, the fruit with 70% maturity（yellow）was rated as the main harvesting period for long-term storage of EBF cherry fruit; the fruit with 90% maturity（red）was regarded as the main harvesting period for short-term storage and fresh food of EBF cherry fruit.

In this paper, with the stolon tip of ‘Xiangye’ strawberry used as test material, the key technology of rapid propagation of explants such as sterilization, induction and differentiation culture, subculture and rooting culture were studied with tissue culture method, and the rapid propagation technology of strawberry cultivar ‘Xiangye’ stem tip tissue culture was established. The results showed that using 10% sodium hypochlorite to disinfect the explants for 5 minutes, the disinfection effect was the best and the survival rate was the highest, reaching 64.44%. The best medium for strawberry explant induction and differentiation was MS+Thidiazuron（TDZ）1.0 mg/L+Naphthalene acetic acid（NAA）0.1 mg/L, and the induction and differentiation rate was 67.78% at the stage of explant induction and differentiation. The best medium formula for cluster bud multiplication of strawberry was MS+TDZ（0.75 mg/L）+NAA（0.2 mg/L）, and the value-added coefficient was 4.11 at the stage of cluster bud subculture and multiplication. The optimum medium for rooting of strawberry cluster buds was MS+NAA 0.1 mg/L and the rooting rate was 98.33% in the rooting stage.