攀西稻作区杂交水稻施钾的增产效应及生理作用

Responses of Grain Yield of Hybrid Rice to Potassium Fertilizer and the Physiological Functions of Potassium Fertilizer in Panxi Region,Sichuan Province

以杂交中稻汕优６３为材料，研究了攀西稻作区杂交水稻施钾的增产效应及生理作用。结果表明，在攀西稻作区，杂交水稻施钾有显著的增产效应，但过量施钾其增产效应降低，施钾量与稻谷产量呈二次曲线关系，经济最佳施钾量为Ｋ２Ｏ１１７．９ｋｇ／ｈａ，施氮量为Ｎ１５０ｋｇ／ｈａ，施氮、钾比为２１．５７；施钾可促进稻株对Ｎ、Ｐ、Ｋ的吸收及干物质的积累，也有利于养分及光合产物向穗部的运转，但过量施钾时效应也会降低；在缺钾稻田，增施氮肥难以增产，必须增施钾肥才能达到增产目的。

The responses of grain yield of hybrid rice Shanyou to 63 and the physiological functions of K fertilizer were studied in Panxi rice plant egion. The results were as follows:Panxi rice potassium(K) fertilizer plant region is the K deficient area and the application of K fertilizer increased the rice grain yield significantly by 3 50%～9 12%,but the percentage of increase in grain yield reduced at high K level. The grain yield showed significant quadratic curves correlation with the amount of K applied. It was proved that the optimum economical fertilization rates were 117 9 kg K 2O/ha and 150 kg N/ha, the ratio of N∶K 2O was 2∶1 57 The application of K fertilizer promoted the absorption of NPK and accumulation of dry matter and the distribution of NPK and dry matter in the panicles, but high level of K(225 kg K 2O/ha) was unfavourable. It was also found that excessive N was not favorable to grain yield and the the application rate of K was essential to grain yield in the paddy field with K deficiency.