不同施肥水平对杂交水稻氮、磷、钾吸收积累的影响

为探索不同施肥量下2个杂交水稻植株氮、磷、钾的吸收积累特性，采用田间小区试验研究了两个杂交稻品种抽穗期和成熟期的植株氮、磷、钾吸收积累。结果表明，2个杂交水稻品种在不同施肥水平下，抽穗期和成熟期茎＋叶鞘、叶、穗各器官内的氮、磷、钾的含量无显著差异；抽穗期，叶的氮含量最高，茎＋叶鞘的磷、钾含量最高；成熟期，叶的氮含量、茎＋叶鞘的磷含量、穗的钾含量均下降。抽穗期，氮、钾吸收量及干物质量红泰优996高于粤优589，磷吸收量粤优589高于红泰优996；成熟期，氮、钾吸收量及干物质量粤优589高于红泰优996，磷吸收量2品种差异不明显。2个杂交水稻品种地上部植株对氮、磷、钾积累量比例的变幅范围均在高产水稻积累变幅范围内。

Effects of Different Fertilizer Application Rates on Uptake of Nitrogen, Phosphorus and Potassium of Hybrid Rice

In order to explore the characteristics of nitrogen(N), phosphors(P) and potassium(K) uptake of 2 hybrid rice varieties under different fertilizer application rates, a field experiment was conducted to study the absorption and accumulation of nitrogen, phosphorus and potassium at heading stage and maturity stage. The results showed that no significant differences were found of NPK uptake in stems and leaf sheathes, leaves, panicles at heading and maturity stage under different fertilizer application rates. At heading stage, leaves have the highest nitrogen content, stems and leaf sheathes have the highest phosphors and potassium content, At maturity stage, nitrogen content in leaves, phosphors content in stems and leaf sheathes, potassium content in panicles were all decreased. Hongtaiyou 996 has higher nitrogen and potassium uptake rates and dry biomass, and has lower phosphors uptake rates compared with Yueyou 589 at heading stage, but at maturity stage, nitrogen and potassium uptake rates and dry biomass of Yueyou 589 was higher than Hongtaiyou 996, no obvious differences of phosphors uptake rates between two tested varieties. Fertilizer use efficiency of Hongtaiyou 996 was higher than Yueyou 589, variable range of accumulation ratio of nitrogen, phosphorus and potassium in aboveground plant of two tested hybrid rice varieties was within the accumulation variable range of high-yielding rice.