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.
出处
《华北农学报》
CSCD
北大核心
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
