秸秆还田对水田土壤养分影响的研究

Effect of Straw Returning on Soil Nutrition in Paddy Field

通过水稻秸秆还田试验,探索秸秆还田对水稻的增产效果和对土壤理化性质的影响,同时验证秸秆腐熟剂促进水稻秸秆分解和培肥地力的作用效果,为大田生产推广秸秆还田加秸秆腐熟剂提供科学依据。结果表明：应用秸秆还田和秸秆还田加腐熟剂均具有增产效果,各试验点均表现为处理〉对照的增产趋势,增产率可达到4.67%以上,增产效果显著,但秸秆还田和秸秆还田加腐熟剂的处理间增产效果不显著。从对土壤理化性质上看,秸秆还田能够促进土壤中养分积累,土壤有机质年均提高0.17~0.19g·kg-1,提升幅度为0.49%~0.56%,有效磷、有效钾、缓效钾、全氮、全磷、全钾、CEC值含量均有不同程度提升,秸秆腐熟剂具有促进秸秆腐解的作用,能够提升秸秆还田作用效果,但效果不显著。

In order to provide scientific basis for adding decomposing agent when straw returning in field,the rice straw returning experiment was carried out to explore the yield increasing effect of straw returning and the influence of physical and chemical properties of soil.Simultaneously,the ability of rice straw decomposition by decomposing agent and the effect of fertility were studied.The results showed that whether add decomposing agent or not,straw returning could increase the yield of rice,treatmentsCK in all the experimental locations.The effect of increasing yield was significant,it could be more than 4.67%,but the effect of the treatments between straw returning and straw returning also add decomposing agent was not significant.Straw returning could promote the nutrient accumulation in the soil,annual rise of the content of soil organic matte was 0.17~0.19g·kg-1,increased by 0.49%~0.56%,the content of available phosphorus,available potassium,slowly available potassium,total nitrogen,total phosphorus,total potassium and CEC promoted inordinately.Decomposing agent could promote the effect of straw decompose,and also could enhance the effect of straw returning,but it was not significant.