[目的]研究不同磷源及用量对冷浸田水稻磷素吸收利用和产量的影响,探求在冷浸田水稻磷肥适宜用量.[方法]以D优202为材料,在皖南山区冷浸田中开展钙镁磷肥和过磷酸钙2个磷肥品种及3个磷素水平田间试验.[结果]在冷浸田开沟降渍的条件下,施钙镁磷肥的增产效果比过磷酸钙好,均以75 kg/hm2 P2O5产量最高.冷浸田施磷有利于水稻有效分蘖的形成.过量施磷导致每稳实粒数和千粒重降低,不利于产量的进一步提高.[结论]在研究条件下,冷浸田水稻施磷以75 kg/hm2 P2O5为佳,可保证水稻各生育期适宜磷素累积量,增加分蘖数和穗实粒数,提高水稻产量.%[ Objective ] The effects of different phosphorus sources and amount on rice yield and phosphorus use in cold-waterlogged paddy field were studied, and the appropriate amount of phosphorus was explored. [Method] D You 202 was taken as materials. The field experiment of two kinds of phosphatic fertilizers and three levels was carried out. [ Result ] Under the condition of ditching in the cold-waterlogged paddy field, the effect of calcium magnesium phosphate on the yield was better than that of calcium superphoshate, and the yield was the highest when the concentration of P2O5 was 75 kg/hm . Phosphorus fertilizer could promote the formation of effective tillering of the paddy rice. But the excessive phosphorus fertilizer could cause the decrease of grain number per spike and 1 000-grain weight, and inhibit the increase of the yield. [ Conclusion ] Under the experimental condition, the optimum amount of phosphorus fertilizer was 75 kg per hectar, which could ensure the suitable phosphorus accumulation at each growth period,increase tiller number,grain number per spike,and the yield.
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