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杂交早稻威优49亩产450千克左右,每亩平均吸收氧化钾7.880千克,其中79.16%为土壤供钾。杂交早稻一生中前期吸钾量占38.60%,中期占42.29%,后期占19.11%.群体总吸钾量与总吸氮量呈1∶1的关系.肥料钾的利用率为28.12%.施钾明显促进抽穗前茎鞘醣的积累和抽穗后茎叶醣向谷粒的转运.施钾对产量的影响主要表现为总粒数、实粒数和千粒重的增加。在本试验中等供钾土壤条件下,杂交早稻亩施5千克氧化钾的增产效应最大.
The hybrid early rice Weiyou 49 mu yield 450 kilograms, the average absorption of potassium per kilogram 7.880 kilograms, of which 79.16% of the soil for potassium. The amount of potassium absorption in early hybrid rice was 38.60% in middle period, 42.29% in middle period and 19.11% in late period.The population total K uptake and total nitrogen uptake was 1: 1. The utilization rate of fertilizer K was 28.12% Apparently, the accumulation of saccharose and the translocation of stem and leaf sugar to grain were significantly promoted before heading.The effect of potassium application on grain yield was mainly as follows: total grain number, seed number and 1000-grain weight. Under the conditions of equal potassium supply in this experiment, the yield-increasing effect of 5 kg K2O per mu of early hybrid rice was the highest.