四段式根茬心土混合犁改土技术对白浆土物理性状及大豆产量的影响

Effects of a Four-stage Stubs Subsoil Mixing Plough Improving Technique on Planosol Physical Characters and the Soybean Yield

通过对白浆土土壤含水量、容重、硬度及对大豆产量的测定分析，研究四段犁改土技术对土壤物理性状、水分利用率及大豆产量的影响。结果表明：经过一个作物生育期后，四段式根茬心土混合犁深松与对照相比，土壤30-40cm土层含水量增加25．78％、容重降低20．47％、硬度降低40．60％，0～50cm土层含水量平均增加11．23％、容重降低6．90％。大豆产量提高33．38％，差异达到极显著水平。

According to the mensuration and analysis of soil moisture, soil bulk density, soil hardness and the yield, the effects of a four-stage stubs subsoil mixing plough on planosol physical characters,water use efficiency and soybean yield were studied. The results indicated：Through a growth period of crop,a four-stage stubs subsoil mixing plough improving the soil treatment compared with the CK：in 30- 40 cm soil layer, the soil water content increased by 25.78%, soil bulk density was reduced by 20.47%, the hardness was reduced by 40.60%. In 0-50 cm soil layer,the average water content increased 11. 23% ,the bulk density was reduced by 6.90%. The soybean yield was improved by 33. 38% ,the discrepancy reached a very significant level.