旱地玉米免耕系统土壤养分研究  

A Study on Soil Nutrient with No tilllage in Dryland Corn Field

作　　者：籍增顺[1] 张树梅[1] 薛宗让 阎玄梅[1] 樊兰瑛[1] 张志琴[1] 洛希图[2] 武金芳 张象俊 

机构地区：[1]山西省农业科学院农业资源综合考察研究所 [2]汾阳市区划办公室

出　　处：《华北农学报》1998年第3期62-67,共6页Acta Agriculturae Boreali-Sinica

基　　金：山西省青年科学基金

摘　　要：１９９４～１９９５年对旱地玉米不同耕作系统土壤磷、钾进行了研究，并对６年的玉米产量作了简要分析，结果表明，在６年的试验地上，免耕覆盖后，０～２０ｃｍ土层速效磷比常规耕作玉米种植区平均低６３．８８％，加大磷肥用量是免耕覆盖持续高产的关键措施之一。土壤速效钾玉米种植区免耕覆盖０～２０ｃｍ土层比常规耕作平均高２５．６４％，２０～５０ｃｍ土层基本无差异。速效钾的增加既是高产的基出，也是提高作物抗旱性的重要因素。休闲地的变化趋势与玉米田基本一致。随着免耕年限的增加，增产幅度减小，周期以３～４年为宜。A study was conducted during 1994～1995 in dryland corn field to determine the changes of soil phosphorus,potasium and corn yield under four tillage systems.The four tillage systems included no tillage with whole stalk mulch, mulch with whole stalk after full plow, conventional tillage and plough under the stalk after the harvest. Results indicated that:compared with coventional tillage, soil Olsen P decreased by 63 88% at 0～20 cm depth; exchangeable K increased by 25 6% at 0～20cm depth;and no difference was found between no tillage and coventional tillage at 20～50 cm depth. The period of no tillage was 3～4 years.

关 键 词：免耕 覆盖 土壤养分 免耕周期 旱地玉米 

分 类 号：S513.061[农业科学—作物学]