摘要
通过近20年对淮安市农田主要作物肥料投入与产出的养分平衡定点监测,结果表明:氮素投入盈余过剩,磷素仍有盈余,钾素亏缺数量较大,耕层土壤种植小麦、水稻以及经济作物对化学肥料的依赖性越来越高,地力贡献率逐年下降。2008—2012年氮素投入平均盈余259.05 kg/hm2,磷素平均盈余76.05 kg/hm2,钾素平均亏缺211.35 kg/hm2;2007—2012年地力贡献率平均年递减3.6个百分点,小麦对肥料的依赖性高于水稻,平均高出6.5个百分点,经济作物对化学肥料的依赖性更高,平均分别高出小麦、水稻12.1、18.6个百分点。
The fixed-point monitoring of the nutrient balance of main crop fertilizer input and output in Huai＇ an City was carried out during nearly last 20 years. The results showed that nitrogen input surpluses, phosphorus was in surplus, deficiency of potassium in larger quantities, soil, rice and wheat crops reliance on chemical fertilizers was more and more high, fertility rate declined year by year. During 2008 to 2012, average nitrogen input was 259.05 kg/hm2 in surplus, average phosphorus was 76.05 kg/hm2 in surplus, average potassium defieited for 211.35 kg/hm2. During 2007 to 2012 ,average annual fertility rate decreased by 3.6 percentage points ,and dependence rate on fertilizer wheat was higher than that on rice ,amounting to 6.5 percentage points. The dependence rates economic crops on chemical fertilizers were higher,and the average dependence higher than wheat and rice by 12.1 and 18.6 percentage points respectively.
出处
《现代农业科技》
2014年第1期229-231,236,共4页
Modern Agricultural Science and Technology
关键词
农田
肥料投入
产出
养分平衡
江苏淮安
farmland
fertilization input
yield
nutrient balance
Huai＇an Jiangsu
