摘要
地处塞外高原的山西省右玉县,土地贫瘠,风蚀、水蚀都很严重。近几年来,该县采取广种豆科牧草、扩大柠条、紫穗槐豆科灌木种植面积,农田实行豆禾轮作等措施,利用生物固氮,提高土壤肥力,收到良好效果。全县土壤普查平均,土壤有机质含量由0.79％增加到0.89％,全氮含量由0.051％增加到O.059％,速效磷由3.9ppm增加到5.5ppm。实践证明,生物固氮是大面积提高土壤肥力的一项有效措施。
Youyu County,Shanxi Province,located at the highland outside the Great Wall, is suffering poor fertility of soil and severe erosion of runoff and wind .Recently,measures of biological azotification for fertilizing soil have been adopted,such as expanding planted area of bushes in pea family,and carrying outcrop rotation of peas and millets. Investigation throughout the county shows that content of organic material increased to 0.89% from 0.79% ,nitrogen to 0. 059% from 0.051%arid rapid available phosphorus to 5.5 ppm from 3.9 ppm.The biological azotification has been proved as an effective way to fertilize soils through practice.
出处
《中国水土保持》
北大核心
1989年第5期26-27,56,共3页
Soil and Water Conservation in China
