不同施肥方式下土壤氮素的运移特征研究

本文针对干旱半干旱地区农田土壤剖面水分、养分空间分布严重错位的问题 ,从减少氮肥损失提高氮素利用率出发 ,提出孔源施肥技术 ,并对孔源及常规施肥方式 (表层全面施肥 )下麦田土壤的氮素运移特征进行了研究。结果表明 ,两种施肥方式下 ,土壤氮素的时空变化有其异同点 ,与常规施肥相比 ,孔源施肥条件下 ,土壤氮素剖面分布更趋合理 ,水分与氮素达到了协调统一 ,促进了作物对土壤氮素的吸收利用

Soil Nitrogen Transport Characteristics under Different Fertilizer Application Practice

In view of the problem of dislocation of water and nutrient in soil profile in arid and semi-arid areas and the aims of reducing nitrogen fertilizer loss and improving nitrogen use efficiency,we put forward a new technique of fertilizer application named hole-source and also studied the nitrogen transport characteristics of soil croped with wheat under hole-source and conventional fertilizer application practice(i.e. fertilizer was applicated on the soil surface at a full-scale).The results showed that there had common and also different characteristics of soil nitrogen transport characteristics under two patterns.Compared with conventional pattern,soil nitrogen's distribution on soil profile was more reasonable under hole-source pattern.The latter also make water and nitrogen coordinate well and promoted crop's uptaking of soil nitrogen.