Abstract:

Hydroponics experiment was carried out in greenhouse to study the accumulation and use efficiency of nitrogen and potassium in hybrid rice and its parent lines, and conventional rice supplied with three nitrogen resources, NO₃^-, NH₄⁺, and NO₃^-+NH₄⁺, and with three K supply levels.The results showed that nitrogen and potassium concentration and accumulation were different among four genotypes. Compared with conventional rice, hybrid rice had greater response to N sources at the high potassium level. The heterosis of hybrid rice is better demonstrated with NO₃^--N under high K supply level than either NH₄⁺/NO₃^- or NH₄⁺-N.

Key words: nitrogen, potassium, hybrid rice, conventional rice, nutrient use efficiency

摘要： 采用营养液培养法研究了不同氮源和钾水平对杂交稻及其父母本和常规稻氮、钾吸收和积累的影响。研究结果表明 ,3种氮源对水稻氮钾营养吸收、积累利用的影响程度与钾营养状况及水稻品种有关。与常规稻相比 ,杂交稻对硝态氮的营养特性具有明显杂种优势 ,硝态氮营养可有效地促进杂交稻钾的吸收、积累 ,且其营养特性与父母本密切相关。

关键词: 氮素, 钾素, 杂交水稻, 常规稻, 养分利用效率