【摘要】 研究了水稻吸钾规律及其生育期内紫色土钾素动态变化。结果如下 :水稻移栽后 0～ 4 5天内 ,吸钾量逐渐上升 ,4 5天时达最高 ,随后逐渐下降。在 0～ 3 0天内 ,土壤速效钾、非交换性钾变化不明显 ,3 0～ 4 5天则明显下降 ,4 5天时达最低 ,随后逐渐回升 ,75天时达较高水平并基本稳定更多还原

【Abstract】 The pattern of potassium uptake by the rice crop in its growing period and the dynamics of potassium in purple soil were studied. Uptake of K by the rice plants rose steadily after transplanting, reached the maximum in 45 days and dropped gradually thereafter. The content of readily available K and non-exchangeable K in the soil remained little changed in the 0～30 days after transplanting, decreased markedly in the 30～45 days, rose again after that, reached the maximum on the 75 th day after transplanting and remained relatively stable thereafter.更多还原