摘要
通过对灰漠土农田生态系统土壤养分进行长期施肥观测试验,化肥与有机肥配施对提高土壤的有机质含量效果明显。总体看来,经过9a的定位施肥,土壤的有机质和全氮、速效磷含量有所提高,速效钾、缓效钾含量下降明显。施用化肥能在短期迅速提高土壤的生产力,从长期看,配施有机肥的土壤的生产力贡献率大。不同处理对冬小麦产量的影响表明,氮是作物产量主要限制因素。土壤养分的可持续指数与各养分的相关分析表明,在施肥时要考虑各养分间相互影响作用。
Based on the 9year continuous fertilization trial in the farmland ecosystems of grey desert soil oases, it has been shown that the application of different organic manure and chemical fertilizers improved the organic contents, total N and available P, while the content of available K and potential K was decreased. Coordinate application of organic manure and chemical fertilizers of N, P and K was the best way to increase the yield and soil productivity. The influence of different treatments on the sustainability indices of N, P and K was also studied. The results of correlation analyses indicated that the sustainability indices of soil nutrients could be used for indicating the dynamic changes of soil nutrients.
出处
《干旱地区农业研究》
CSCD
北大核心
2003年第4期35-39,共5页
Agricultural Research in the Arid Areas
基金
中国生态网络CERN项目资助
