Effects of Potash Fertilizer Amount on Rice Yield and Potash Use Efficiency in Coastal Salinealkaline Rice Growing Areas

Taking ‘Yanfeng 47’ as a case，effects of different potash fertilizer amounts on character，yield and potash use efficiency of rice were discussed with plot experimentsResults showed that appropriate amount of potash fertilizer could increase rice panicles and spikelets in per unit area，colony leaf area index and effective rate of leaf area，dry matter yield，and ratio of dry matter accumulation and grain yield after the full heading stage.Potash use efficiency and productivity were improved with appropriate amount of potash fertilizer，and then rice yield was increased.Suitable amount of potassium（K2O）was 67.5~90.0kg/hm2 in coastal salinealkaline rice growing areas.