The Study On Effect Of Straw Returning On Soil Fertility In Northeastern China

Northeastern China is an important agricultural area in China.Stalks mainly consist of corn stalks and rice stalks,with a large amount of production.In recent years,the quantity and quality of soil organic matter in black soil arable land in Northeast China have shown a rapid decline.Straw return to straw is an effective way to comprehensive utilization of straw resources,both to increase soil fertility but also at the source to curb the haze problem caused by straw burning,especially in recent years due to incineration of straw and smog haze,smog blocking the road Northeast China,it is imperative.In order to comparatively study the effect of returning straw to soil on soil fertility,this study,taking as an opportunity,the implementation of soil conservation(straw returning)project in Nong’an County of Jilin Province,selected 303 monitoring sites in 9 townships in Nong’an County.Field experiments were conducted to study the effect of straw returning on the organic matter content and soil bulk density in the soil.The results showed that soil fertility after straw returning increased.Specifically,the reduction of soil bulk density decreased to 1.21 g/cm3,by an average of 4.65% and the soil organic matter increased to 27.2 g/kg,by an average of 3.32%.The study shows that it is feasible to repair the soil by using straw returning in the autumn and winter season in Northeast China.This method can be popularized in Northeast China.