摘要
分析定位试验23年后传统耕作(CT)和宽窄行交替种植条带深松(ST)两种耕作方式土壤剖面理化特性和玉米产量差异,探明保护性耕作对农田黑土结构特性、肥力和玉米产量的长期影响.结果表明,与CT处理相比,ST处理显著降低0～20 cm 土层容重和垂直方向20～22.5 cm土层紧实度,增加0～20 cm 土层非毛管孔隙度、田间持水量、饱和含水量和饱和导水率,显著提高30～90 cm土层有机质、全氮、碱解氮含量、C∶P、C∶K、N∶P和N∶K,增加0～10 cm 土层全磷和速效磷含量,改善0～40 cm 土层pH值,玉米产量提升5.75％～17.39％.
Abstract
This study investigates the long-term effects of conservation tillage on the structural properties,soil fertility,and maize yield in farmland black soil.It compares the physicochemical properties of soil profiles and maize yields between conventional tillage(CT)and wide-narrow row alternative planting with strip subsoiling tillage(ST)after 23 years of experimentation.The results indicate that,compared to CT,ST significantly reduced bulk den-sity in the 0-20 cm soil layer and penetration resistance in the 20-22.5 cm soil layer.Additionally,ST improved the field capacity,saturation moisture content,and saturated hydraulic conductivity in the top 20 cm of soil.ST in-creased the content of organic matter,total nitrogen,alkali-hydrolyzable nitrogen,and the ratios of C∶P,C∶K,N∶P,and N∶K in the 30-90 cm soil layer.ST also elevated the levels of total and available phosphorus in the 0-10 cm soil layer and ameliorated soil pH in the 0-40 cm soil layer.Furthermore,ST increased maize yields by 5.75％to 17.39％compared to CT.
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