一、改善土壤理化性质秸秆肥疏松,能给微生物提供大量氮素营养,促进微生物活动,增加土壤中的腐殖质,有利于团粒结构的形成,从而改善土壤理化性质。连年施用秸秆肥的地块,土壤容重下降,孔隙度增加。古于乡大房村第七村民小组,近几年由于增施秸秆肥,土壤容重由1.45降到1.29,土壤孔隙度由46.1%增加到51.4％。 First, to improve the physical and chemical properties of straw Stalks loose, can provide a large number of microorganisms to provide nitrogen nutrition and promote microbial activity, increase soil humus, is conducive to the formation of aggregate structure, thereby improving soil physical and chemical properties. Successive years of application of straw fertilizer plots, soil bulk density decreased porosity increased. In the past few years, due to the application of straw fertilizer, the soil bulk density decreased from 1.45 to 1.29 and the porosity of the soil increased from 46.1% to 51.4%.