不同磷钾用量对杂交水稻渝香203干物质生产和产量的影响

Effects of Different Fertilization Rates of P and K on Dry Matter Production and Grain Yield of Hybrid Rice Yuxiang 203

研究了不同的磷钾肥用量处理对优质杂交稻渝香203干物质积累转运以及产量的影响。结果表明:在施N量固定在150kg/hm2时,施P 75 kg/hm2、施K 45或90 kg/hm2的处理光合产物积累量大,物质生产能力较强,茎鞘物质转换率较高,转运量多,产量高;施用P 75 kg/hm2、K 90 kg/hm2的处理产量最高,肥料贡献率和农学利用率较高,单位施肥量增加水稻产量的能力较强。在施N量固定在150 kg/hm2时,施P量大于75 kg/hm2或施K量大于90 kg/hm2不利于后期茎鞘物质的转运和产量的提高。

The effects of different fertilization rates of P and K were studied on the dry matter accumulation and grain yield of quality hybrid rice Yuxiang 203. The results showed that, when the N rate was fixed at 150 kg/hm2, the treatments with the P205 rate at 75 kg/hm2 plus the K20 rate at 45 or 90 kg/hm2 had the highest accumulation of photosynthate, a stronger matter production capacity, a higher transformation percentage of the matter in stem and leaf sheath （TPMSS） and a higher export percentage of the matter in stem and leaf sheath （ EPMSS）, resulting in a higher grain yield. The treatment with the P205 rate at 75 kg/hm2 plus the K20 rate at 90 kg/hm2 had the highest grain yield and a higher fertilizer contribution rate （FCR） and agronomic efficiency （AE）, indicating a stronger yield increasing ability per unit fertilization. When the N rate was fixed at 150 kg/hm2, the treatments with the P2 05 rate more than 75 kg/hm2 or the K2 0 rate more than 90 kg/hm2 were not favorable to the transportation of the matter in stem and leaf sheath in late stage and resulted in a decrease in grain yield.