安徽沿江地区水稻施钾效应研究

［目的］为钾肥在安徽沿江地区的合理施用提供科学依据。［方法］采用随机区组排列，在芜湖县进行田间试验以研究安徽沿江地区土壤的钾素状况和施钾效应。［结果］当氮肥施用量为220 kg/hm^2时，施钾处理的水稻分别比对照增产4.73%、9.46%和12.78%。当氮肥施用量为286 kg/hm^2时，施钾处理的水稻的最高产量比对照增加了15.61%。新复极差测验表明，高氮高钾处理的增产幅度极显著大于其他处理；同等施氮水平下，施钾处理的水稻产量均显著高于对照。高氮高钾条件下，钾素利用率达52.56%，表观平衡出现微亏8.42 kg（K2O）/hm^2；常氮高钾条件下，钾素利用率明显下降，表观平衡出现盈余41.10 kg（K2O）/hm^2。水稻收获后土壤缓效钾含量有不同程度增加，水稻种植前后的土壤速效钾含量的变化不一。［结论］在氮肥相应增加的基础上，该地区同等肥力土壤的推荐施钾量为169 kg/hm^2。

Research on the Potassium Application Effect on Rice in the Area along Yangtze River in Anhui

Objective]The research aimed to supply scientific basis for the reasonable application of potassium fertilizer in the area along Yangtze River in Anhui.Method] The potassium status and potassium application effect of soil in the area along Yangtze River in Anhui were researched in the field experiment with randomized block arrangement carried out in Wuhu County.Result] When the nitrogen application amount was 286 kg/hm2,the yields of rice fertilized with potassium fertilizer were increased by 4.73%,9.46%...