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利用网袋法研究白三叶与黑麦草不同配比处理[白三叶100%+黑麦草0%(B)、白三叶75%+黑麦草25%(B3H1)、白三叶50%+黑麦草50%(B1H1)、白三叶25%+黑麦草75%(B1H3)、白三叶0%+黑麦草100%(H)]在果树行间10cm土层215d的腐解及养分释放规律。结果表明,绿肥翻压35d内干物质腐解和碳释放较快(腐解率均达40%以上),氮、磷、钾分别在前21、35和50d内释放较快,随后逐渐减慢。翻压215d后,干物质腐解率,碳、氮、磷、钾释放率和干物质腐解量,碳和氮释放量均表现为B>B3H1>B1H1>B1H3>H,磷和钾释放量表现为BP>N,养分释放量均表现为K>N>P。综合分析试验期果树养分需求和5种处理养分释放规律,B3H1处理可作为渭北果园生草混播翻压的最优模式。
The net bag method was used to study the effects of different treatments of white clover and ryegrass [white clover 100% + ryegrass 0% (B), white clover 75% + ryegrass 25% (B3H1), white clover 50% + 50% ryegrass (B1H1), white clover 25% + ryegrass 75% (B1H3), white clover 0% + ryegrass 100% (H)] Decomposition and nutrient release law. The results showed that the decomposing of dry matter and the release of carbon were quicker (the decomposition rate reached more than 40%) within 35 days of green manure turning over. Nitrogen, phosphorus and potassium were released faster in the first 21, 35 and 50 days respectively and then gradually slowed down . After being pressed for 215 days, the decomposition rates of dry matter, the release rate of carbon, nitrogen, phosphorus, and potassium, the amount of decomposed dry matter, and the release of carbon and nitrogen were both B> B3H1> B1H1> B1H3> H, The cumulative release rates of five kinds of green manure showed K> P> N, and the nutrient release showed K> N> P. Based on the comprehensive analysis of the nutrient requirements of the fruit trees and the release of five kinds of nutrients during the experimental period, B3H1 treatment can be used as the optimal model for mixing and pressing the raw grass in Weibei orchard.