免耕春小麦套种牧草土壤养分动态研究

研究免耕春小麦Triticum aestivum套种牧草土壤养分的动态变化，分析了小麦套种白花草木樨Melilotus albus、野豌豆Vicia villosa、英吉沙豌豆Pisum sativum、玉米Zea mays、毛苕子V.villosa对土壤有机质、碱解氮和速效磷的影响。结果表明，套种牧草能提高土壤有机质、碱解氮和速效磷的含量，特别是套种白花草木樨和套种野豌豆增加更为明显，其中套种白花草木樨土壤碱解氮含量增加4.8 mg/kg，增幅19.4%，套种野豌豆土壤有机质增加0.39 g/kg，增幅1.6%，土壤速效磷含量增加了8 mg/kg，增幅23.9%;土壤有机质、碱解氮和速效磷含量随土层深度的增加而降低。

Dynamic change of soil nutrient in free tillage spring wheat-grass intercropping land

The experiment studied dynamic change of soil nutrient in free tillage spring wheat-grass intercropping land,and analyzed the effect of wheat-sweet clover,wheat-wild pea,wheat-pea,wheat-maize,wheat-hairy vetch intercropping on soil organic matter,alkali-soluble N and available P.The result showed that the treatments of wheat-grass intercropping increased soil organic matter,alkali-soluble N and available P.Wheat-sweet clover and wheat-wild pea intercropping increased alkali-soluble N 4.8 mg/kg(19.4%) and so...