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通过水培试验与土壤试验研究了不同ＮＨ_４~＋、－Ｋ~＋离子浓度组合对水稻苗期吸收氮素的影响，以及不同阳离子存在时对土壤矿物固固定态铵释放量与黑麦草和水稻苗期吸氮之间的关系。结果表明，－Ｋ￣＋的存在并不直接影响作物对ＮＨ＿４￣＋的吸收，但却明显地抑制了矿物固定态铵的释放。因此采用土壤作为培养基质时，所得出的－Ｋ￣＋、ＮＨ＿４￣＋颉颃结论很有可能是由于Ｋ＋抑制了矿物固定态铵的释放而造成作物吸氮减少，特别是所采用的土壤中含２：１型粘土矿物较多时更有可能发生这种情况。
The effect of NH_4 ~ +, - K ~ + ion concentration on nitrogen uptake by rice at seedling stage was studied by hydroponic culture and soil experiment. The effect of different cation on soil mineral solid fixed ammonium release was compared with that of ryegrass and rice The relationship between nitrogen uptake at seedling stage. The results showed that the presence of -K ~ + did not directly affect the uptake of NH_4 + by the crop, but significantly inhibited the release of fixed ammonium. Therefore, when soil is used as culture medium, the conclusion of -K + +, NH4 + + is most likely due to K + inhibiting the release of ammonium from fixed mineral in soil, resulting in the decrease of nitrogen uptake in crops. In particular, This is more likely to happen when 2: 1 type clay minerals are more abundant.