Effects of no-tillage with different corn stubble treatments on topsoil structure properties

Based on no-tillage with ridge way of corn in cold,windy and sandy areas in Northeast China,through the fixed-point experiment of conservation tillage in Zhangwu County from 2003,the effects on topsoil(0～30 cm) structure properties under three different kinds of corn stubble treatments of stubble mulch(SM),stubble coverage(SC) and Elimination of stubble(ES) were studied comparatively.The results showed that the treatment of SC to improve the soil structure properties was performed obviously.On the soil layers of 0～10 cm,10～20 cm and 20～30 cm,0.25 mm water stable aggregate content and aggregate stability were SCSMES,and they decreased with the soil depth increasing.In different soil layers,soil bulk density showed ESSMSC,soil total porosity showed SCSMES,and it showed a decreasing trend with the deepening of topsoil.In different soil layers,the sand content of SC was less than that of SM and ES,but with topsoil getting deeper,the clay content of each treatment showed no regular change.