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磷钾是水稻生长发育所需的大量元素,一般常规水稻品种每生产500千克稻谷需吸收五氧化二磷4.0～7.5千克,氧化钾9.1～19.1千克。对磷的吸收量以拔节孕穗期为最多,对钾的吸收量则以分蘖期到拔节期达最大值。磷钾吸收比例最高在幼穗分化至齐穗期,吸收磷素占全生育期47.4～57.0％,钾素占51.8～61.9％。三系杂交籼稻的磷素营养规律与高产常规品种大体一致,只是每生产500千克稻谷需磷量稍低于常规品种,而对钾的吸收量则远较常规品种为高,而且植
Phosphorus and potassium are a large number of elements required for the growth and development of rice. Generally, 500 kg of rice is required to absorb 4.0-7.5 kg of phosphorus pentoxide and 9.1-19.1 kg of potassium oxide per 500 kg of conventional rice. The uptake of phosphorus in the jointing booting stage is the largest, while the absorption of potassium in the tillering stage to jointing up to the maximum. The highest proportion of phosphorus and potassium absorbed in young panicle to panicle, absorbed phosphorus accounted for 47.4 ~ 57.0% of the whole growth period, potassium accounted for 51.8 ~ 61.9%. The phosphorus nutrition of three-line hybrid indica rice was consistent with that of high-yield conventional varieties except that the amount of phosphorus required per 500 kg of rice was slightly lower than that of the conventional varieties and the absorption of potassium was much higher than that of the conventional varieties