Effect Of Straw Returning On Soil Physicochemical Properties And Crop Yield And Nutrient

Crop straw is an important organic fertilizer in rural areas, which can be regarded as slow-release fertilizer. It has many advantages such as long residual action of organic fertilizer, quick acting of chemical fertilizer, nutritious, lasting effect and so on. To develop ecological agriculture nowadays, we should promote to use straw rationally with safe and recycle treatment, thus to reduce the production costs and achieve benefits of the win-win economic and environmental purpose.In this study, the resource utilization of straw and agricultural production were combined. In Mianyang City of flatland hilly area, in order to carry out field trials on yellow soil, purple soil-based soil. By setting three different treatments of straw returning, general fertilizer with no straw returning treatment as control, to study the effect of straw returning on soil physicochemical properties and crop yield and nutrient, and initially identified the best local straw treatment, so as crop residues science in agricultural production resource utilization to provide some technical support. The major results of this study were as follows:1. Effect of straw returning on soil physical and chemical propertiesResearch shows that both straw returning directly or straw returning added rotten agents can be reduce soil bulk density, improve soil organic matter content, increase soil total N, total P, total K, available N, available P, available K, slowly available K and CEC, but has little effect on soil pH. Straw returning directly can reduce soil bulk density of about 2.83%, improve soil organic matter content of about 12.25%, increase soil nutrient content of 3.27%-13.40%; straw returning added rotten agents can reduce soil bulk density of about 4.27%, improve soil organic matter content of about 22.17%, soil nutrient content of 5.09%-24.65% increased.2. Effect of straw returning on crop yield and nutrientUnder straw returning treatment, the crop yields were significantly higher than the control treatment without straw returning, oil-see rape can increase yield 8.49%-14.88%, com increase yield 5.02%-10.46%, and rice increase yield 4.24%-9.70%. At the same time, straw returning can be improved to a certain extent of NPK nutrient contents of crop of grain and straw, help the next quarter of straw returning recycling. The results show that straw returning directly or straw returning added rotten agents can increase crop NPK nutrient contents were 1.02%-29.48% and 5.45%-31.50%.3. Best mode of local straw returningIn Mianyang City of flatland hilly area, yellow soil, purple soil-based soil with straw weight of 300-500kg/667m2 and (CM) microbial inoculants 2kg/667m2 way of straw returning on soil fertility improvement effect is best, this way of straw returning to increase on crop yield and NPK nutrient contents is also the best.