不同密肥条件对超级稻珞优8号的影响

【目的】研究不同密肥生态条件下超级稻珞优8号的生长及高产群体的结构特征，为超级稻的栽培调控和群体控制提供理论依据。【方法】2010年早季，以超级稻珞优8号为材料，进行4个抛栽密度48万株／ha（A1）、60万株／ha（A2）、72万株／ha（屯）、84万株/ha（A4）和2个施氮水平150kg／ha（B1）、225kg／ha（B2）试验，生长期内调查超级稻茎蘖动态，并进行干物质测定及成熟期穗粒结构调查等。【结果】超级稻珞优8号在不同施肥量及不同种植密度条件下，表现出一定的产量差异，以抛栽密度48万株／ha（A1）、施氮水平150kg／ha（B2）组合的综合效益最佳。【结论】生产中，通过适宜抛栽密度、合理施用氮肥和采用“好气灌溉”调节水分是超级稻获得高产的重要调控途径。

Influence of different planting density and N application rates on growth and yield components of super rice variety Luoyou 8

[Objective]The influence of different planting densities and nitrogen fertilizer application on growth and yield characteristics of super rice variety Luoyou 8 has been studied in order to provide a high-yield cultivation technique. [Method] The treatments have been designed with the combinations of four planting densities @ 4.8×10^5 （A 1）, 6.0×10^5 （A2）, 7.2×10^5 （A3） and 8.4×10^5 plants/ha （A4）, and two nitrogen application levels @ 150 （B1） and 225 kg/ha （B2） to investigate the tillering characters at growing stage, and dry matter production and partitioning and panicle characters and yield components at maturity stage during early season of 2010. [Result]Significant differences have been observed in yield components in plants treated with different nitrogen fertilizer rates and planting densities. The combination of 4.8×10^5 plants/ha and 150 kg/ha nitrogen showed the best results. [Conclusion]The high yields of super rice variety can be achieved by practicing its cultivation with suitable planting density and reasonable nitrogen applications.