论文部分内容阅读
根据 6年相关农业统计资料和土壤养分分析数据 ,研究了资中县 1985～ 1999年农田养分平衡与土壤养分动态变化。分析结果表明 ,2 0世纪 90年代以后 ,农田氮素大量盈余 ,盈余率超过 5 0 %;磷素盈余率超出 80 %;钾素 1998年前一直处于亏缺 30 %以上的状态 ,1998、 1999年已趋于平衡。同时 ,通过对 1983年和 2 0 0 0年土壤养分含量的对比分析 ,研究了近 2 0年来土壤养分动态变化 ,阐述了农田养分平衡对土壤养分的影响 ,并针对农田养分平衡与土壤养分变化状况提出了相应的调控对策和措施
Based on the data of 6 years of agricultural statistics and soil nutrient analysis, the dynamic changes of nutrient balance and soil nutrients in Zili County from 1985 to 1999 were studied. The results showed that after the 1990s, there was a large surplus of farmland nitrogen, the surplus surpassed 50%, the surplus of phosphorus exceeded 80%, and that of potassium was more than 30% short of 1998 before 1998 Year has become more balanced. In the meantime, through the comparative analysis of soil nutrient contents in 1983 and 2000, the dynamic changes of soil nutrients in recent 20 years were studied, and the effect of farmland nutrient balance on soil nutrients was expounded. Aiming at the changes of soil nutrient balance and soil nutrients The situation put forward the corresponding control measures and measures