深耕条件下秸秆还田对不同质地土壤肥力的影响

在河南省两个生态区进行2年定位试验,研究常规耕作+秸秆还田(CT)、深耕+秸秆还田(DT)和深耕-秸秆不还田(DNT)3种耕作方式对土壤肥力的影响。结果表明,深耕能够提高不同质地土壤的肥力。深耕后土壤全氮、有效磷和速效钾的含量在壤土上分别增加3.4%、14.2%、4.7%,在粘土上分别增加8.6%、7.6%、3.9%。秸秆还田能提高深耕后土壤的养分含量,在深耕条件下,秸秆还田后土壤有机质、全氮、有效磷和速效钾含量在壤土上分别增加3.0%、13.8%、11.0%和11.8%,在粘土上分别增加1.6%、20.2%、10.8%和6.0%。在深耕基础上,秸秆还田有利于土壤养分含量的提高,该效应受年份、土层深度和土壤质地的影响显著。

Effect of Straw Retained on the Fertility of Deep Tillage Soil

In order to study deep tillage and straw retained treatment(DT), conventional tillage and straw retained(CT), deep tillage and no straw retained treatment(DNT) on the fertility of soil. The location research works were studied in Henan province in recent 2 years. The results showed that deep tillage and straw retained both could increase the content of total nitrogen, available potassium of soil, enhance the fertility of soil. In contrasting with that of soil by CT, the content of total nitrogen, available phosphorus and potassium of loam and clay soil by DT increased by 3.4%, 14.2%, 4.7% and 8.6%, 7.6%, 3.9%, respectively. In contrasting with that of soil by DNT, the content of organic matter, total nitrogen, available phosphorus and potassium of loam and clay soil by DT increased by 3.0%, 13.8%, 11.0%, 11.8% and 1.6%, 20.2%, 10.8% and 6.0%, respectively. Straw retained could improve the fertility of deep tillage soil, but the result was effected by years, soil depth and the texture of soil.