施氮量和栽培密度对超高产早稻Y两优302产量及其构成因素的影响

【目的】筛选适宜的施氮量和栽培密度,为广西桂北生态条件下超级稻高产栽培提供理论依据。【方法】以超高产早稻Y两优302为材料,探讨2个施氮水平150kg/ha（N1）、225kg/ha（N2）和4个栽培密度24.4万蔸/ha（D1）、30.6万蔸/ha（D2）、36.8万蔸/ha（D3）、42.6万蔸/ha（D4）在生育期内对水稻产量的影响。【结果】Y两优302产量主要受有效穗数和每穗粒数的影响,穗长和千粒重对产量影响不明显。在施氮量为225kg/ha,栽培密度为24.4万~30.6万蔸/ha时,有利于Y两优302增产。【结论】较高的施氮量和较低的栽培密度有利于Y两优302产量的进一步提高。

Effects of transplanting density and nitrogen fertilizer rate on yield and its components in super-high-yielding early rice variety Y-liangyou 302

Objective]The present experiment was conducted to find out appropriate rate of nitrogen application and planting density for high-yield super rice variety Y-liangyou 302 in north region of Guangxi. Method]A field experiment was conducted with different transplanting densities （24.4,30.6,36.8 and 42.6×104 hills/ha） and nitrogen fertilizer rates （150 and 225 kg/ha） to investigate their effect on the yield of super-high-yielding early indica rice variety Y-liangyou 302, during different growth stages. Results]The yield of Y-liangyou 302 was mainly affected by panicles and spikelets per panicle, while the spike length and 1000-grain weight did not showed any significant influence on yield. The highest yield was recorded in the treatment with 225 kg/ha nitrogen fertilizer and 24.4×104 to 30.6×104 hills/ha planting density. Conclusion]High nitrogen and low planting density is conducive to increase the yield of rice variety Y-liangyou 302 in north region of Guangxi.