论文部分内容阅读
江西省１９９７年农田Ｎ、Ｐ、Ｋ养分现状为：农田养分支出量为７４．３８３８×１０４ｔ、Ｐ２Ｏ５２１．８８７４×１０４ｔ、Ｋ２Ｏ４９．７５０１×１０４ｔ。其中粮食作物支出Ｎ占７３．９％，Ｐ２Ｏ５占７２．７％，Ｋ２Ｏ占７８．０％；投入农田养分Ｎ９０．６７×１０４ｔ，Ｐ２Ｏ５３２．９７×１０４ｔ，Ｋ２Ｏ４０．８×１０４ｔ，其中化肥Ｎ占７３．２０％，Ｐ２Ｏ５占８８．９０％，Ｋ２Ｏ占６０．５％，有机肥在农田钾素供应中仍占有重要地位；江西农田养分平衡状况，氮素有盈余（＋２１．９％），磷有较多盈余（＋５０．６％），钾则明显亏缺（－２１．９％）。江西农田有机质（Ｃ）平衡，估算江西有机质年分解量２２５３ｋｇ／ｈｍ２，年生成量５７６７ｋｇ／ｈｍ２，年生成量大于年分解量，土壤有机质出现积累。在综合分析现有资料基础上，提出了江西农田养分平衡允许率，Ｎ：－５．７％，Ｐ２Ｏ５：－３０％，Ｋ２Ｏ：－５４％。提出减磷、节氮，促进钾氮再循环的增效设想，和控制化肥用量，提高化肥肥效的建议，并提出实施的主要途径
The status of N, P and K nutrients in farmland in Jiangxi Province in 1997 was as follows: the nutrient expenditure of farmland was 74.3838 × 104t, P2O5 was 21.8874 × 104t, and K2O was 49.7501 × 104t. Among them, N accounted for 73.9% of the total expenditures on food crops, P2O5 accounted for 72.7% and K2O accounted for 78.0%. N90.67 × 104t, P2O532.97 × 104t and K2O40.8 × 104t were put into the farmland, of which N 73.20%, P2O5 accounting for 88.90% and K2O accounting for 60.5%. Organic fertilizer still occupies an important position in the supply of potassium in the farmland. The balance of farmland nutrient balance in Jiangxi shows a surplus of nitrogen (+ 21.9%), phosphorus There was more surplus (+ 50.6%) and potassium was clearly deficient (-21.9%). Jiangxi organic matter (C) balance, estimated annual decomposition of organic matter in Jiangxi Province 2253kg / hm2, the annual production of 5767kg / hm2, annual production is greater than the annual decomposition, accumulation of soil organic matter. Based on the comprehensive analysis of existing data, the allowable rate of nutrient balance of farmland in Jiangxi Province is proposed, N: -5.7%, P2O5: -30% and K2O: -54%. Put forward the suggestion of reducing phosphorus, saving nitrogen and promoting synergistic recycle of potassium and nitrogen, controlling the dosage of fertilizer and improving fertilizer efficiency, and put forward the main ways of implementing