Study on Suitable Sowing Date and Rate of Interplanting Rape with Green Manure in Orchards

【Objective】 To conduct experiments of interplanting rape as green manure in Aksu area walnut orchard of trees with the age of 7 years, and study the growth and effect of returning interplanting rape as green manure under different sowing dates and sowing rates with a view to providing a theoretical basis for the promotion and application of rape as green manure in that area. 【Methods】 To conduct experiments of interplanting rape as green manure in Aksu area walnut orchard of trees with the age of 7 years, and study the growth and effect of returning interplanting rape as green manure under different sowing dates and sowing rates with a view to providing a theoretical basis for the promotion and application of rape as green manure in that area. 【Results】 Different treatments had effects on the yield of green manure rape, plant nutrient content, orchard soil pH, water-soluble salt and soil nutrient. The yield of D₁R₂ was the highest, and the yield of fresh grass before turning was 42.88 t/hm²; The plant of total nitrogen content of D₁R₂ treatment was significantly higher than the other treatments, while the total phosphorus and potassium content of D₂R₃ and D₂R₂ treatment were highest. The soil pH of D₁R₁, D₂R₃ and D₂R₄ treatments was the lowest after the rape was overturning pressure for one month. The content of water-soluble salts of D₁R₄ and D₂R₁ treat-ments was the lowest. The content of organic matter, hydrolytic nitrogen and available ph-osphorus in D₁R₂ treatment was the highest, and the content of available potassium in D₂R₂ treatment was the highest. 【Conclusion】 Interplanting rape green manure in orchards in Aksu region can mak-e sufficient use of the water and nutrients in the thawed soil layer. Sowing in ice crust of rape of 22.5 kg/hm² can increase the yield of rape green manure and improve the soil fertility of orchards.