水稻不同磷肥用量及运筹的验证与肥料利用率研究

通过水稻不同施磷量及运筹试验，探讨对产量及磷肥利用率的影响。结果表明：以每667m^2施P_2O_5 8kg，即基施P_2O_5 50％（4kg／667m^2）＋倒5叶50％（4kg／667m^2）产量最高；同时合理磷肥用量能显著提高磷肥利用率，特别是提高拔节至抽穗期吸磷量是提高水稻产量重要途径；最佳施磷量及运筹，当季磷肥利用率在35％左右，成熟期植株最佳含磷为0．555％，百公斤稻谷吸磷量以1．11kg为最佳。

Test and Verification of Phosphorus Amount and Application and Fertilizer Utilization Efficiency in Rice

The experiment of different phosphorus amount and application was carried out to study the effect of phospho- rus on grain yield and fertilizer utilization efficiency. The results showed that the yield was the highest when eight kg phosphorus per 667 m^2 was used as basal fertilizer （50%） and at inverted fifth leaf stage （50%）. The rational application of phosphorus could significantly increase fertilizer utilization efficiency and especially, it was an important yield-increasing approach to increase phosphorus uptake amount from jointing to heading stages. The best result of phosphorus application was that the fertilizer utilization efficiency is 35% or so, the optimum P content in plant at maturity was 0.555%, and the P uptake content per 100 kg grain was 1.11 kg.