【摘要】 在玉米连作基础上连续少耕20年,玉米平均产量9015.7kg/hm2,比连耕20年增产4%;在干旱灾年平均产量6933.5kg/hm2,比连耕增产6.7%,具有较强的抗旱力。土壤紧实度(容重)保持在1.263～1.353g/cm3的最佳状态,土壤绝对含水量高于连耕10.66～13.7kg/m3,土壤pH6.1(呈中性反应)大于连耕pH5.7(呈微酸性反应),缓冲作用强于连耕。土壤全P和速效N、P、K高于连耕,保肥能力强于连耕,经济效益突出。更多还原

【Abstract】 By means of continuous minimum tillage for20years f o r maize cropping,the average yield of maize was9015.7kg/ha,which increa sed4%than continual plowing and that yield was6933.5kg/ha which increas ed6.7%than the continual plowing in the drought condition.The maize of mini mum tillage has higher resistivity.Soil volume-weight of minimum tillage keeps the optimum condi-tion in1.263～1.353g/cm 3 .Soil-water content absolute was more10.66～13.7kg/m 3 than continual plowing.Soil pH6.1(neutral reac-tion)of minimum tillag e is more than soil pH5.7(acid reaction)of continual plowing.So the buffer effect is higher than the soil of continu-al plowing.The whole P and quick ac ting N?P?K are more higher than in the soil of continual plowing.So that the fertility keeping is higher than the continual plowing.Efficiency of minimum ti llage stick up.更多还原