Effects of different amounts of K fertilizer application on rice yield, main agronomic characters and economic benefits in early rice were studied in the field experiment.The test results showed that K application significantly increased rice grain yield, straw yield and total biomass yield, compared with the CK Ⅰ and CK Ⅰ.The rice grain yield, straw yield and total biomass yield increased with the increasing dosage of K application.K application increased the rice plant height,effective panicles and 1 000 grain weight.The net income was the highest at the rate of K2O 90 kg/hm2.Below this level,the net income increased with the increasing dosage of K application, but the net income decreased at the rate of K2O 120 kg/hm2.Based on the fertilizer-yield responses the theoretical maximum grain yield was gained with K2O 89.8 kg/hm2.It was suggested that the recommended K application rate for early rice is K2O 75 ～ 105 kg/hm2 with 22 500 kg/hm2 pig manure application in this area.%在田间试验条件下,研究了不同施钾量对水稻产量、农艺性状及经济效益的影响.结果表明,施钾能显著提高稻谷、稻草和总生物产量,且随施钾量的增加而增加;施钾有利于提高水稻株高、有效穗数和千粒重;当施钾量为K2O～90 kg/hm2时,净收入随施钾量的提高而提高,而施钾量高于90 kg/hm2时,净收入反而降低.通过拟合钾肥用量和产量的肥效方程,得出当施钾量为89.8 kg/hm2时,可获得最高产量.在施猪粪22 500 kg/hm2的条件下,推荐该地区早稻的钾肥适宜施用量范围为K2O75～105 kg/hm2.
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