淹水条件下铵的矿物固定与钾对铵固定的影响  

MINERAL FIXATION OF NH_4^+ AND ITS COMPETITION WITH K^+ IN THE SUBMERGED SOILS

作　　者：封克[1] 殷士学[1] 汤炎[1] 周平 尤传芳 俞菊仙 

机构地区：[1]江苏农学院农学系,扬州225001

出　　处：《江苏农学院学报》1993年第3期29-36,共8页Jiangsu Agricultural Research

基　　金：国家自然科学基金

摘　　要：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。The present research was conducted to study the effects of NH_4^+ and K^+ of various concentrations on the fixation of NH_4^+ and K^+ and their interrelations in 18 paddy soils under submerged conditions. Results showed that these soils when submerged had considerably large capability of fixing NH_4^+ applied as N fertilizer. When application rate amounted to 200mgNkg^-, 32％～63％ were fixed within 2 days. When NH_4^+ and K^+ were applied simulteniously, K^+ had no effect in general on NH_4^+ fixation. However, if the application of K^+ was prior to NH_4^+, amount of fixed NH_4^+ seemed to be decreased and more K^+ was fixed as compared to that when NH_4^+ and K^+ were simultaneously applied. The ratio of fixed NH_4^+ to K^+ was 1.7～3.3 in terms of equivelant cations of NH_4^+ and K^+ used.

关 键 词：淹水 铵态氮 矿物固定 钾 

分 类 号：S143.12[农业科学—肥料学]