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水稻施肥的主要复杂性在于有很大部份氮素被淋溶和反硝化作用损失掉了。当增加灌溉时,特别是在轻质土壤中,钾的移动性增大。在利用 N~(15)进行的五年试验中,移栽时按5、10、15厘米深度和表层施入硫酸铵的结果证明,复土施肥较表层施肥能为作物保存更多的氮素。这说明前者损失气态氮较少。据某些国家进行栽培试验的分析结果,泰国用表层施肥损失氮
The main complication of rice fertilization is that a large proportion of nitrogen is lost by leaching and denitrification. Potassium mobility increases when irrigation is increased, especially in light soils. In the five-year experiment using N15, the results of applying 5,10,15 cm depth and applying ammonium sulfate on the surface during the transplanting proved that the application of compound soil fertilization could save more nitrogen for the crop than the surface fertilization . This shows that the former lost less gaseous nitrogen. According to the analysis results of cultivation tests carried out in some countries, Thailand uses surface fertilization to lose nitrogen