施钾对寒地水稻养分吸收与分配的影响

Effects of Applying K Fertilizer on Nutrient Absorption and Nutrient Distribution of Rice in Cold Region

为提高寒地水稻养分利用效率,指导合理施肥提供参考。以粳稻品种空育131为材料,研究不同钾肥用量下水稻氮、磷、钾元素吸收和分配的规律。结果表明,施钾后稻谷和稻草中氮、磷相对含量下降,钾元素相对含量升高,氮、磷、钾绝对含量均增加;稻谷中氮、钾养分占全株比重变小,而磷的比重增大。施钾有利于促进水稻对氮肥和磷肥的吸收利用,本试验条件下以全生育期90.0kg/hm2K2O的施用量较佳。

A Japonica rice varieties ＂Kongyu 131＂ was used to study absorption and distribution of nitrogen,potassium and phosphorus under different potassium fertilizer applications to improve nutrient use efficiency of rice in cold region.The results showed that after potassium application the relative contents of nitrogen and phosphorus in grain and straw declined while that of potassium increased.Absolute contents of nitrogen,potassium and phosphorus increased.Proportions of nitrogen and potassium nutrient in the whole plant became smaller while that of phosphorus became larger Potassium application is beneficial to nitrogen and phosphorus absorption and utilization in rice.Under the conditions of this experiment,the optimum potassium application during the whole growth period was 90.0 kg/hm^2 K2O.