Abstract:

In order to study the machinery working improved planosol, six treatments was established compared with conventional machinery working, the effects of different subsoil mixing interval on planosol physical characters and yield of soybean were investigated. Compared with conventional mechanical operation, the results indicated that two years later after improve the soil 20-60 cm subsoil mixing layer could increase the soil water content, decrease the soil bulk density and decrease the soil hardness of different treatments. In addition, the increased range of soil water content was 1.02%-4.90%, the decreasing range of soil bulk density was 4.93%-10.56% and the decreasing range of soil hardness was 3.05%-28.15%, respectively. the treatments of T2 effect was the best. Among six treatments, the higher yield were the treatments of T5 and T2 and can be reached 1991.92 kg/hm2 and 1969.57 kg/hm2.Compared with conventional mechanical operation, the yield increased by 7.92% and 6.71%, the difference reached significant levels.