Effects Of Different Straw Return Methods On Soil Nutrient,Greenhouse Gas Emissions And Crop Yield In A Rice-wheat Rotation System

Greenhouse gas-induced global warming issue attracted wide attention from scientists,agricultural management practices on agricultural land has a very important impact of greenhouse gas emissions.China is a large agricultural country,straw is very rich,and straw as a reasonable and effective way to solve the straw,not only can improve soil fertility and increase crop yields and alleviating environmental pollution from crop straw burning.However,with the increase of crop yield,the increasing amount of straw,the current patterns of straw has been unable to meet production needs,therefore,to achieve the total amount of straw,ecological,safe way to straw is particularly important.This research Yu June 2014-June 2015 in Jiangsu Province Nanjing Jiangning district Chun hua town Dragon community test base,carried out field community test,research under rice wheat rotation conditions,different of straw also field way on farmland soil nutrient,and greenhouse gas emissions and crop production of integrated effect,aimed at exploration a guarantee rice wheat rotation district of production based Shang can suitable to increased soil fertility and reduced greenhouse gas emissions of straw also field way,for guide and perfect straw also field technology provides theory based and practice according to.Test results are as follows:1.Straw can increase soil nutrient contents and buried of straw to soil on soil organic matter and total nitrogen content and crop yield increasing effectAnd the control stalks are not to field(CK)than straw manure can increase rice quarter after quarter and soil organic matter,total nitrogen,phosphorus and potassium content and straw buried manure processing(WD),two seasons of soil organic matter and total nitrogen content of rice and wheat are highest,followed by Rotary tillage wheat straw to field(WR).Straw plowed fields(WP)of paddy soil available phosphorus and available potassium and crop potassium content was significantly higher than that of CK,CK increase,respectively,and 19.9%and 9.4%and available phosphorus content in wheat under WD significantly higher CK.Straw manure can increase the production of rice and wheat,and has some influence on yield components.Effects of different ways of straw return to soil on yield no significant difference,but it yields some differences in the degree of,with actual production of rice and wheat under WD are higher than other treatments,and the actual production of rice and wheat CK increased by 2.1%and 20%,respectively.2.Straw also significantly increase integrated warming potential cropland CH4 and N2O,and straw buried can be alleviated to a certain extent farm greenhouse gas emissionsCompare with CK,straw manure not only to increase paddy CH4 emissions,and after the quarter of wheat has some influence for CH4 emissions,whether it is wheat or daoji,WR and WP CH4 emissions are higher than the WD.Paddy,compared with CK and WP,WR and N2O emissions under WD significantly lower,but no significant differences between WP and CK,different ways of straw return to soil significantly increased wheat season N2O emissions,but no significant differences between the various fields.Compare with CK,paddy straw return to soil to increase paddy GWP,and WR Max,but also increase wheat GWP,WP was the highest.Paddy,compared to WR,WD reduce the GWP of 8.6%;wheat,compared to WP,WD significantly reduce the GWP of 27.8%.3.Straw also significantly increases the agricultural greenhouse gases CH4 and N2O emissions,compared with conventional fields,ditch burying of straw return to soil to reduce greenhouse gas emissions intensityStraw not compared with the control,straw can increase rice and the annual wheat crop yield,and WD under the highest yield,than CK 7.8%.Compare with CK,straw manure significantly increased CH4 and N2O the annual integrated warming potential of the gas,wheat straw to soil also can improve the annual greenhouse gas emissions intensity.Three straws on the greenhouse effect gas emissions were not significant,and Rotary tillage and conventional tillage wheat straw to field the field compared to straw buried manure treatment can reduce 16.7%and 12.1%of greenhouse gas emissions.