寒地水稻秸秆腐熟剂对水稻秸秆翻埋还田的腐熟效果及土壤养分含量的影响

Effect of Rice Straw Decomposition Agent on Rice Straw Returning to Field and Soil Nutrient Content in Cold Region

为促进秸秆腐熟微生物菌剂在我国农业生产上的推广应用,本试验通过设置4个处理:秸秆不还田(CK),秸秆直接还田(T1),秸秆+尿素+腐熟剂(T2),秸秆+腐熟剂(T3),秸秆+尿素(T4),研究水稻秸秆还田后的失重率、水稻秸秆的断裂拉力值及土壤养分含量变化情况。结果表明:T2处理的秸秆断裂拉力值在90d试验结束时最小,为33.2N,T2处理比T1处理减少了21N;T2处理的水稻秸秆失重率值最大、达到了57.26%,T1与T2处理之间相差10.23百分点;处理T2、T3、T4土壤有机质、全氮、有效磷、速效钾含量均有增加,pH略有降低。秸秆还田配施腐熟剂处理的土壤养分有所增加,所以开展秸秆还田并配施秸秆腐熟剂能够培肥土壤,提高土壤肥力。

In order to promote the popularization and application of microbial agents for straw decomposition in China′s agricultural production,in this experiment there were four treatments including no straw returning(CK),direct straw returning(T1),straw+urea+composting agent(T2),straw+composting agent(T3),and straw+urea(T4).The weight loss rate of rice straw,the breaking force of rice straw and the changes of soil nutrient content were studied.The results showed that,at the end of 90 days,the minimum breaking force value of T2 treatment was 33.2 N,which was 21 cattle less than that of T1 treatment;the weight loss rate of rice straw in T2 treatment was the highest,reaching 57.26%,and the difference between T1 and T2 was 10.23%;T2,T3 and T4 treatments had the highest value soil organic matter,total nitrogen,available phosphorus,available potassium and other nutrient indicators increased,but pH,available phosphorus and weight decreased slightly.Straw returned with rotten agent of soil nutrients increased,so to carry out the straw returned and with straw rotten agent can improve soil fertility.