水稻不同磷肥用量及运筹的验证与肥料利用率研究

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

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667m2施P2O58kg,即基施P2O550%(4kg/667m2)+倒5叶50%(4kg/667m2)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。

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.