Effects of Tillage Styles and Straw Return on Soil Properties and Crop Yields in Direct Seeding Rice

Through field located experiment and some analysis of soil physical and chemical properties,the effect of tillage styles and straw retrun on soil physical and chemical properties and crop yields in direct seeding rice was studied.The results indicated that straw return reduced soil bulk density,increased soil porosity and the non-capillary porosity,and increased soil organic matter,available N,available P and available K.The deep-plough style could improve soil fertility.Effects of tillage styles and straw return on crop yield had no significant difference.At the same time,straw return also could decrease rice straw burning,improve country ecological environment and realize clean agriculture production.