Journal of Tianjin Agricultural University ›› 2023, Vol. 30 ›› Issue (5): 11-15.doi: 10.19640/j.cnki.jtau.2023.05.003

• Researches and Scientific Notes • Previous Articles     Next Articles

Effects of long-term winter green manure on soil organic nitrogen components

Dai Xuebin1, TianXiuping1,Corresponding Author, Zhao Qiu2,Corresponding Author, Dong Jiaxi1   

  1. 1. College of Agronomy and Resource Environment, Tianjin Agricultural University, Tianjin 300392, China;
    2. Institute of Agriculture Resource and Environment, Tianjin Academy of Agriculture Science, Tianjin 300192, China
  • Received:2022-03-23 Online:2023-10-31 Published:2023-12-22

Abstract: The effects of 7 different kinds of winter green manure on soil organic nitrogen components were studied by Bremner acid hydrolysis method using 7 kinds of winter green manure and mixed sowing methods in fluvo-aquic soil of northern China. The results showed that total acidolysis nitrogen accounted for 74.81% of total nitrogen in the soil organic nitrogen. In the soil organic nitrogen, the content of nitrogen in various forms was ranked as unknown nitrogen>amino acid nitrogen>amide nitrogen>amino sugar nitrogen. The nitrogen in the soil of winter green manure under long-term overturning pressure was mainly transformed into acidolysis nitrogen. The total nitrogen of different winter green manure increased significantly in RG, OV and VR+OV. In 2020, the soil amino acid nitrogen and amino sugar nitrogen were lower than those in 2013, while the soil under winter green manure treatments were higher than those in 2013, with RG and OV increasing the most. In 2020, the soil amide nitrogen and unknown nitrogen were higher than those in 2013, and the soil under different green manure treatments were higher than those in winter fallow field. Correlation and path analysis showed that the positive correlation coefficient and direct path coefficient between amino acid nitrogen and alkali-hydrolyzed nitrogen were the largest in soil, and the positive correlation between amino sugar nitrogen and unknown nitrogen and alkali-hydrolyzed nitrogen was also significant, and the direct path coefficient was above 2.

Key words: winter green manure overturning, soil, organic nitrogen component, correlation analysis, size analysis

CLC Number: