作物根茬对土壤腐殖质结合形态的影响

Effect of Crop Stubbles on Combine State of Soil Humus

通过黑钙土的培养试验，研究了不同作物根茬施入土壤后对土壤腐殖质的影响。在整个培养过程中，根茬处理的土壤腐殖质含量均高于对照，提高幅度玉米根茬为００５６％～０１１５％，大豆根茬为００５２％～００９５％，且松结态腐殖质的净增加量（玉米根茬为００２４％～００３７％，大豆根茬为００１０％～００２４％）远大于稳结态腐殖质的净增加量（玉米根茬为０００６％～００２１％，大豆根茬为０００３％～００１３％），而玉米根茬又好于大豆根茬。玉米根茬具有更优于大豆根茬的培肥作用。

This paper studied the effects of different crop stubbles put in soil on soil humus by cultural experiment of churnozem. During cultural course, soil humus content of treatment with stubbles was highre than ck, increased extent of corn stubbles was 0.056%～0115%,soybean stubble was 0.052%～0.015%. Net amount increased of loose humus (0.024%～0.037% for soybean stubbles) was much higher than that of stable humus (0.006%～0.021% for corn stubbles and 0.003%～0.013% for soybean stubbles), and stubbles was better than soybean stubbles. therefor , the results proved that corn stubbles had better effect of improving soil fertility than soybean stubbles.