摘要
通过7个田间试验研究川西北丘陵区水稻产区钾肥效应和适宜施用量。结果表明,适量施用钾肥对水稻具有明显的增产增收效果,7个试验施钾比不施钾增产水稻82.6～1630.3kg/hm2,平均增产679.2kg/hm2;增产幅度为1%～21.3%,平均达7.4%;施钾纯利润平均为744.3元/hm2,产投比平均为3.7;钾肥偏生产力和农学效率平均分别为131.1kg/kgK和9.2kg/kgK。根据肥料效应方程,水稻钾肥最佳经济效益用量在15.0～70.9kg/hm2之间,平均为53.4kg/hm2。土壤有效钾含量与水稻钾肥最佳用量之间呈极显著负相关关系,二者间的对数方程为Y=-37.173Ln(X)+226.25(R2=0.7562**)。
7 filed trials were carried out to study the response to potassium and optimum K application for rice in northwest Siehuan hilly area. The results showed that K application both significantly increased yield and profit. Yield increment ranged from 82.6 to 1630.3 kg/hm^2, the average was 679.2 kg/ hm^2; The increment ranged from 1% to 21.3%, the average was 7.4%; The average net profit of K application was 744.3Yuan/hm^2, and the value cost ratio was 3.7; The average partial factor productivity of applied K and agronomic K use efficiency were 131.1 kg/kg and 9.2 kg/kg. According to fertilizer response equations, the economical K application rates were 15.0 kg/hm^2 to 70.9 kg/hm^2, the average rates was 53.4 kg/hm^2. It was evident that the economical K application rates had significant negative eorrelation with soil available K level, and the logarithmic equation was Y = -37.173Ln（X） ＋ 226.25 （R^2 = 0.7562^＊＊）.
基金
国家测土配方施肥项目
关键词
水稻
钾肥
肥料效应
钾肥推荐用量
Rice
potassium fertilizer
effective potassium
Optimum K recommendation rates
