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各地研究结果表明,亩产千斤稻谷的水稻,平均吸氮(N)22.5斤,磷(P_2O_5)11斤,钾(K_2O)27斤,吸收氮、磷、钾的比例为1:0.48:1.23,与其它禾谷类作物吸肥比例相仿,这是决定水稻施肥量的基本数据之一。近年来,用同位素技术探明了一个奇妙的事实:水稻一生需要的氮素养分有65～75%是由土壤供应的,而肥料供应的氮素养分仅占25～35％。这说明培肥水田土壤是水稻高产;稳产和低成本生产的基础。所不同的是,
The results of the research all over the country showed that rice yield per kilogram of rice was 22.5 kg on average, 11 kg of phosphorus (P 2 O 5) and 27 kg of potassium (K 2 O), and the ratio of N, P and K was 1: 0.48: 1.23, It is one of the basic data to determine the amount of rice fertilizers that is similar to the proportion of other cereal crops in terms of fat absorption. In recent years, the isotope technique has proved a wonderful fact: 65-75% of the nitrogen needed in rice’s life is supplied by the soil, while the nitrogen supplied by fertilizers only accounts for 25-35%. This shows that paddy field paddy soil is high yield rice; stable and low-cost basis for production. The difference is,