钾肥运筹对中籼稻产量·钾素积累利用的影响

目的]为杂交中稻的合理施肥提供理论依据。方法]通过田间试验,研究钾肥运筹对中籼稻产量和钾素积累利用的影响。结果]施钾可以显著提高水稻产量。在120 kg/hm2施钾量下,钾肥一次性基施或钾肥后移产量差异不明显;而在150 kg/hm2施钾量下,钾肥后移能显著提高水稻产量,比全作基肥处理增产9.56%。钾肥的穗肥追施比一次性基施明显增加拔节至抽穗的吸钾量和比例,提高实粒数、结实率和产量,并显著提高钾素利用效率。结论]杂交中稻施用钾肥应掌握施中低量钾肥时作基肥的效果较好,而高量钾肥分次施用有明显的增产效果。

Effects of Potassium Management on Indica Rice Yield and Accumulation and Utilization of Potassium

Objective]The research aimed to provide the theoretical basis for the rational application of fertilization to indica rice.Method]Field trial was conducted to study the effects of potassium management on indica rice yield and the accumulation and utilization of potassium.Result]The application of potassium could increase the rice yield significantly.The effects of one-time basal application and potassium retrusion with the amount of 120 kg/hm2 potassium on the yield weren’t obvious.The rice yield was increased by 9.56% with 150 kg/hm2 potassium retrusion compared with that of one-time basal application.K uptake and the ratio were increased in jointing-heading stage,the number of grains per panicle,ripening rate and the yield were increased,and the potassium utilization efficiency increased obviously.Conclusion] The effect of middle or low amount potassium as basal fertilizer was better.And under the high amount potassium fertilizer,the effects of split application on the yield were obvious.