深松对棕壤农田土壤和玉米产量的影响

Effects of Subsoiling on Soil Properties of Farmland and Corn Yield in Luvisols

在辽宁省昌图县开展了深松对旱地玉米农田土壤容重、水分状况和作物产量影响的研究,结果表明深松使亚耕层土壤(20~40 cm)容重有降低趋势,但未达到显著水平。深松有效打破了犁底层,显著提高了水分输入初期(前2小时)水分入渗量,但对土壤田间持水量与玉米苗期和收获期1 m土层土壤水分含量没有显著影响。深松在干旱年份显著提高了玉米水分利用效率和籽实产量,但在降雨丰沛年份对玉米产量没有显著贡献。与正常深松相比,隔行深松同样利于籽实产量与水分利用效率的提高,二者间无显著差异,加之隔行深松具有节能、高效等优点,因此,可对隔行深松耕作模式加以推广。

The effects of subsoiling on soil physical properties, soil water content and corn yield had been studied in Changtu County, Liaoning Province. The results showed that the bulk density of subsoil(20- 40 cm) numerically declined with subsoiling, whereas the water permeability increased significantly for the first two hours, due to breaking plough pan by subsoiling. The field capacity and soil water content of 0- 100 cm depth, however, were not obviously influenced by soil deep loosening. The effects of subsoiling on increasing corn yield and water use efficiency(WUE)were more significant in the drought year, while the effects were not present in the test year with high precipitation.Furthermore, corn yields were similar between the treatments with interlacing subsoiling and normal subsoiling in this study. Considering the energy saving advantage, interlacing subsoiling had a good prospect of application and extension.