绿肥压青对南方春玉米根际土壤肥力的影响

采用黑麦草、毛叶苕子、紫云英3种绿肥材料进行玉米地压青试验,研究了绿肥压青对南方春玉米根际土壤肥力的影响.结果表明,与无绿肥压青比较,3种绿肥压青对春玉米根际土壤速效养分和有机质含量均有提高效应,其中黑麦草和毛叶苕子的增效最为显著；对玉米根际土壤速效养分而言,毛叶苕子增效好于黑麦草；就有机质而言,黑麦草和毛叶苕子增效相当.研究表明毛叶苕子和黑麦草可作为南方春玉米前茬地的优势绿肥品种.

Effects of Green Manures on Rhizosphere Soil Fertility for Spring Corn in Southern China

Ryegrass,hairy vetch and milk vetch were selected as green manures to study their effects on soil fertility for growing spring corn in Southern China.Results show that compared with the control,three green manures increased the organic matter contents and available nutrients of rhizosphere soil,while ryegrass and hairy vetch showed better effects than milk vetch.Furthermore,hairy vetch was better than ryegrass and milk vetch as for improving the available nutrients,and hairy vetch was about equal to ryegrass regarding the effect on improving the organic matter in rhizosphere soil.Preliminary tests prove that the ryegrass and hairy vetch can be used as the predominant green manure species of winter fallow field.