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采自不同地区１０个土样先经盆栽黑麦草耗竭并去除根系过２ｍｍ筛作供试土样。再向土样中以摩尔比２．８：１同时加入Ｋ￣＋时，土壤的铵固定量比单加处理略有增加，新固定铵、钾摩尔比在６～１０之间。降低同时加入的：Ｋ￣＋摩尔比至１：１．４，新固定铵、钾摩尔比在１．３～２．０之间。先加钾１００ｍｇ／ｋｇ培养４８ｈ后，再加１００ｍｇ／ｋｇ续培养２ｈ，新固定铵、钾摩尔比在１～２．３之间。表明在本试验条件下，土壤有优先固定铵而少固定Ｋ￣＋的现象，无论Ｋ￣＋，同时加入还是Ｋ￣＋先加入者均如此。
Ten soil samples collected from different regions were depleted from the potted ryegrass and the roots were removed with a 2 mm sieve for soil samples. When adding K ~ + to the soil sample at a molar ratio of 2.8: 1, the amount of ammonium immobilized in the soil increased slightly compared with the single treatment, and the molar ratio of new fixed ammonium and potassium was between 6 and 10. Reduce the addition of: K ~ + molar ratio to 1: 1.4, the new fixed ammonium and potassium molar ratio of 1.3 to 2.0. First add potassium 100mg / kg cultured 48h, plus 100mg / kg continued culture 2h, the new fixed ammonium and potassium molar ratio between 1 to 2.3. This indicates that under this experimental condition, the soil has the preferential immobilization of ammonium but less fixed K ~ + phenomenon, regardless of K ~ +, at the same time adding or K ~ + first join are so.