| 摘要: |
| 研究了陕西省及典型农区农田生态系统中养分平衡的结果表明，1977年氮磷处于亏缺状态，80年代末达到平衡且略有盈余，到1997年盈余较多，钾则一直赤字。1997年N∶P2O5∶K2O为1∶0.26∶0.08，低于发达国家水平（1∶0.42∶0.42）。预计到2007～2012年全省农田年化肥需求量为氮肥（N）870 000 t，磷肥（P2O5)365 000 t,钾肥（K2O）174 000 t。适宜的N，P2O5，K2O养分比为1∶0.40～0.42,∶0.15～0.20。 |
| 关键词: 养分平衡 农田生态系统 养分状况评价 陕西省 |
| DOI： |
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| 基金项目:中国科学院南京土壤研究所与IPI合作项目(5006006) |
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| Study on nutrients balance of farming ecosystem in typical areas of Shaanxi Province |
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| Abstract: |
| The survey on farmland nutrients balance has been done in Shaanxi province.The results indication that N,P was deficit in 1997,it was balanced and had a slight surplus by the end of 1980’s,and more surplus in 1997.K was in deficit all along.The ratio of N∶P2O5∶K2 is 1∶0.26∶0.08 in 1997,This is far less than that in the developed countries with is 1∶0.42∶0.42.It is estimated that in 2007-2012,the annual fertilizers requirement of farmand is Shaanxi would be N∶870 000 t,P2O5∶365 000 t and K2∶174 000 t.The proper ratio of N∶P2O5∶K2O will be 1∶0.40-0.42∶0.15∶0.20. |
| Key words: nutrients balance farmland ecosystem nutrients analysis Shaanxi provinc |
