| Straw production in China accounts for 39.5% of the world, but the straw used as fuel. except for a small part of the paper, animal feed, the majority were in situ burning straw, utilization rate is extremely low. Rice and rape are the main crops in Anhui Province, and the annual rice straw yield are many, in 2009 reached 1.89 tons. In this study, the Anhui mountainous area in the south of Qianshan County, "rice-Rice-oil" planting model as the foundation, according to the different tillage and total straw returning with 5 treatments, effect of straw returning on soil fertility and crop biomass, the main results are as follows:(1) effects on soil nutrient, straw returning could increase the content of soil organic matter, and straw returning to soil nitrogen, phosphorus, potassium accumulation. Conventional tillage+straw processing growth rate in soil organic matter, soil total nitrogen, soil available phosphorus and available potassium in the soil were higher than that of no tillage+straw treatment, the conventional tillage+straw could increase soil organic matter, total nitrogen, available phosphorus and available potassium content. Straw returning with conventional tillage is an important way to improve soil fertility.(2) double rice and rape yield, straw returning could increase crop yield, ploughing tillage effect is better than no tillage, conventional tillage+straw returning treatment had the highest yield, the five quarter output reached 22271 kg/hm2, conventional tillage+ straw and tillage+straw processing phase ratio, can increase the yield of 73-748 kg/hm2.(3) double rice and rape growth, different tillage treatments of straw returning on crop growth and accumulation of dry matter are affected. Compared with blank treatment, straw returning could extend the crop growing period.(4) the use of different crops, straw and tillage effects of nitrogen phosphorus and potassium content of rice and rape plants and seeds in each season. In addition to total K, total N plants and seeds and the content of total phosphorus were conventional tillage+returning straw> of no tillage and straw returning. Conventional tillage+straw of rice season.20122012/2013.2013. rape season early rice season late rice planting season in 2013 the total potassium content was highest, while conventional tillage+straw increased the content of total potassium rape season grain and rice grain. |
PDF Full Text Request