Abstract: In response to the problems of severe soil salinization, low productivity, and low self-sufficiency rate of oil crops in coastal areas, four treatments were set up: T1（control）, T2（lactose peptide）, T3（inositol）, and T4（lactose peptide+inositol）to study the effects of biostimulants（lactose peptide, inositol）on salt resistance physiological indicators of peanut leaves, peanut yield, dry matter accumulation, nitrogen and phosphorus nutrient absorption, quality, and nitrogen and phosphorus nutrient efficiency enhancement. The results showed that T4 treatment could significantly enhance the activities of SOD, POD and CAT in peanut leaves, increasing by 12.66%, 21.34% and 40.53% respectively compared with the control. The absorption of nitrogen and phosphorus nutrients in various parts of peanuts was increased by 5.90%-48.01% and 3.44%-42.68% respectively compared with the control. The contents of available nitrogen and phosphorus in the soil were relatively high. The experimental effect of T2 treatment was second only to that of T4. Overall, lactose peptides and inositol biostimulants can enhance the salt resistance and nutrient efficiency of peanuts, with the compound material showing the best effect. This study can provide a theoretical reference for the effective utilization of coastal saline soil.

Key words: coastal salinized soil, biostimulants, salt resistance, peanut, nutrient enhancement