低产紫沙土旱耕地保护性耕作改良效应

低产紫沙土旱耕地是我国南方紫色土区低产早耕地的主要类型之一,湖南各紫色土区都有分布,该土壤呈酸性,易水土流失,易漏水漏肥.土壤质地过沙或过粘,有机质和氮素缺乏,抗旱能力弱,作物产量低.保护性耕作技术试验结果表明:保护性耕作技术能防治水土流失,改良土壤,提高土壤肥力,增强土壤抗旱能力,提高作物产量.

The Improved Effect of Conservation Tillage for Low Yield Dry Farm with Purple Sand-soil

Low yield dry farm with purple sand-soil is one of the major types of low yield dry farm with purple soil in south China, it distribute in each purple sandy cultivated land of Hunan.This kind of purple sand-soil is acidity,it easily cause the soil erosion,leak of water and fertilizer,the desertifieation and sliming of soil texture,the lack of the organic matter and nitrogen,the weakness of drought resistance and the low production of the crop.The experimental result of conservation tillage technique showed that the conservation tillage technique could prevent and control the soil erosion,improving soil,enhancing the soil fertility,enhancing the drought resistance of soil,increasing the output of crop.