耕作措施对旱地土壤理化性状及玉米产量的影响

Effects of Tillage Methods on Physico-Chemical Properties of Dryland Soil and Corn Yield

在湘西州玉米种植地,采用田间定位试验,研究了翻耕、免耕、翻耕+稻草覆盖、免耕+稻草覆盖4种不同耕作措施对旱地土壤的理化性状和玉米产量的影响。结果表明,免耕和稻草覆盖均能降低土壤容重,提高土壤的孔隙度和养分含量,并能提高玉米的产量,有较好的生态效益和经济效益,其中以免耕+稻草覆盖处理的效果最佳,2 a的产量平均比对照增加7.4%,值得在湘西旱地中推广。

B ase on the field experim entconducted in w estern H unan,effects ofthe 4 tillage m ethods ofconventionaltillage w ith no straw ,no tillagewithnostraw,conventionaltillagewithstraw coverandnotillagewithstraw coveronsoilphysico-chemicalpropertiesandcornyield werestudied.Theresultsshowedthatthesoilbulkdensitywasdecreasedwhilesoilporosityandsoilnutrientsandcoreyieldincreasedinno tillage and straw covertreatm ents,and the no tillage w ith straw covertreatm enthad the bestecologicaland econom ic benefits,and increased yieldby7.4% comparedwithcontrol.Itwassuggestedthatthenotillageandstraw covermodelshouldbeadaptedindrylandsoilinwestern H unan.