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以当前生产上推广应用的高产水稻品种中籼糯、徐稻3号、盐稻8号、淮稻6号、连粳7号为材料,研究钾肥施量、种类、施肥方法、施肥期对水稻产量及其构成因素、茎蘖动态、灌浆速率的影响.结果表明:①不同钾肥施肥量对水稻品种的增产效果差异较大,盐稻8号、淮稻6号施钾肥增产幅度最大.②钾肥适宜施量受土壤钾含量影响较大,低钾水平下,产量随施钾量增加而增加.施KCl 0～16 kg/666.7 m2,每增施1 kg/666.7 m2KCl,平均增收稻谷6.7 kg/666.7 m2.施钾量为13.5 kg/666.7 m2左右时,产量达极值,为563.3 kg/666.7 m2,之后产量开始下降.平均每kg KCl增收稻谷6.26 kg,最高可达8.45 kg.③喷施钾肥使籽粒灌浆期缩短,灌浆势提高.④不同种类钾肥比对照增产幅度为5.1%～18.7%,以秸秆和钾肥增产效果最好.
The high yielding rice varieties Zhongnandao, Xuyao 3, Yantai 8, Huaiyao 6 and Lianjing 7 which are popularized and applied in production at present were used to study the effects of different amounts, types and fertilizations of K on the rice yield, Yield and its components, stem-tillering dynamics and filling rate were studied.The results showed that: (1) The yield-increasing effects of different potassium fertilizers on rice varieties were quite different, and that of Yanzao 8 and Huaidao 6 was the largest.② Potash fertilizer The optimum amount of application of KCl was significantly affected by soil potassium content, and the yield increased with the increase of potassium application under low potassium level.Using KCl 0-16 kg / 666.7 m2, with an increase of 1 kg / 666.7 m2 KCl, the average yield was 6.7 kg / 666.7 m2.The yield reached an extreme value of 563.3 kg / 666.7 m2 when the amount of applied potassium was 13.5 kg / 666.7 m2, and the yield began to decline after that.Average kg KCl increased the paddy yield by 6.26 kg and the maximum reached 8.45 kg. Potash fertilizer shortened the grain filling period and increased the filling potential.④The yield of different types of potash increased by 5.1% ~ 18.7% compared with the control, and the yield was the best by straw and potash fertilizer.