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通过施用不同浓度铵态氮肥和钾肥,对18种水稻土在淹水条件下对NH_4~+的固定能力、K~+存在时对NH_4~+固定的影响以及土壤对K~+和NH_4~+固定的比例等方面进行了研究。结果表明。淹水条件下土壤对施人的NH_4~+-N肥具有较高的固定能力。在施氮量达200mg Nkg~(-1)时,2天内可固定施人氮量的32％～63％;其固定速度很快,2h固定量可达48h固定量的56％～95％;一般情况下,NH_4~+、K~+同时施用对NH_4~+的固定没有影响,但先施K~+后施NH_4~+时,除K~+本身的固定明显增加外,对NH_4~+的固定有减少趋势;在给予同样数目的NH_4~+和K~+时,其固定比例约为1.7～3.3。
Through the application of ammonium and potassium fertilizers with different concentrations, the immobilizing ability of 18 paddy soils to NH 4 + in flooded condition, the effect of NH 4 + fixation in the presence of K + Fixed ratio and other aspects of the study. The results show. Under flooded condition, the soil had a higher ability of fixing NH_4 ~ + -N fertilizers. When the nitrogen application rate reached 200mg Nkg ~ (-1), the nitrogen fixation rate could reach 32% ~ 63% within 2 days. The fixation rate could reach 56% ~ 95% of the 48h fixed amount in 2h. In general, NH_4 ~ +, K ~ + application had no effect on the fixation of NH_4 ~ +. However, when K_ + applied NH_4 ~ +, K_ + The fixation ratio decreased from 1.7 to 3.3 when given the same number of NH 4 + and K +.