摘要
通过12a大田长期定位试验研究了在自然降水条件、冬小麦—大豆轮作(或休闲)种植制度下,0～400cm土娄土剖面硝态氮分布与积累的特点。结果表明,长期单施氮肥,氮的表观利用率特别低,仅0.51%,氮肥配施钾、磷肥,氮的表观利用率为25%～35%,氮磷钾平衡施肥及配施有机肥,氮的表观利用率达到50%;施N肥方式显著影响土壤硝态氮积累和淋移,旱地土娄土长期单施化学氮肥或氮钾、氮磷、氮磷钾肥使土壤NO-3-N大量积累和淋移;氮磷钾与有机肥的配合施用能有效地缓解土壤对硝态氮的积累,提高氮肥利用率。
The characteristics of distribution and accumulation of NO-3N in 0～400 cm loess soil profile were studied with a longterm fertilization experiment under the natural precipitation and wheatsoybean (or fallow) rotation in 12 years. The results showed that the apparent use rate of N was only 0.51% under the treatment of N fertilization, and 25%~35% under the treatments of NP of NK fertilization. But the apperent use rate of N was higher than 50% under the treatments NPK balance fertilization or NPK combined with organic manure. Application of NPK combined with organic manure was an effective way to control the leaching loss of NO-3-N, and to increase the utilization rate of nitrogen fertilizer.
出处
《干旱地区农业研究》
CSCD
北大核心
2003年第4期48-52,共5页
Agricultural Research in the Arid Areas
基金
国家土壤肥力与肥料效益监测野外台站项目(2001CCB00800)资助
