摘要
通过对相关农业统计资料的分析 ,研究了犍为县 1985～ 1999年间农田养分平衡状况 ,结果表明 :2 0世纪 90年代以后 ,农田氮素由基本持平转向盈余 2 0 %左右 ;磷素全面扭亏为盈 ,盈余率已超出 5 0 % ;钾素一直处于 5 0 %以上的大比例亏缺状态。并针对农田养分平衡状况提出了控施氮肥、改善磷肥施用技术。
According to statistics, the farmland nutrients balance from 1985 to 1999 in Qianwei county are discussed. The result showed that in 1990's, the nitrogen in farmland changed from equilibrium to surplus, about 20 percent at present time; the content of phosphorus varied from deficiency to surplus, over 50 percent now; the potassium was deficient all along with high proportion, the deficit is over 50 percent. And the regulating ways relevant to changing construction of fertilizer in farmland was given, such as control nitrogen, changing the using ways of phosphorus, etc.
出处
《四川农业大学学报》
CSCD
2002年第3期249-252,共4页
Journal of Sichuan Agricultural University
基金
四川省科技厅重点项目
乐山市科技局重点项目
