不同施氮水平及种植密度对“群优2号”产量的影响

Effects of Different Nitrogen Fertilizer Applications and Planting Density on Yield of Rice “Qunyou NO.2”

【目的】通过探索种植密度及施氮水平等关键栽培技术要点,为"群优2号"大面积示范推广提供依据。【方法】以杂交水稻"群优2号"为材料,设施氮水平及种植密度两个因素单独试验,各5个处理3次重复,对产量及其影响因子进行比较分析。【结果】结果表明施氮水平和种植密度对"群优2号"产量及农艺性状的影响较为显著;随着施氮量的增加,有效穗数随之增加,而穗粒数及结实率、千粒重均减少,产量先增加后减少,以施氮量240kg/hm^2产量最高,为7944kg/hm^2;随着种植密度的增加,有效穗数随之增加,而穗粒数及结实率、千粒重均降低,产量先增加后减少,以种植密度30万蔸/hm^2最高,为8178kg/hm^2。【结论】"群优2号"品种高产稳产性较好,以施氮量240kg/hm^2和种植密度30万蔸/hm^2能获得较高产量。

【Objective】It aims to provide the basis for large-scale demonstration and popularization of"Qunyou No. 2" by exploring the key cultivation techniques such as planting density and nitrogen fertilizer.【Method】In order to comparatively analyze the yield and its influencing factors,experiments are conducted in terms of nitrogen fertilizer and planting density,each with 5 treatments and 3 repetitions by using rice "Qunyou NO. 2"as the material.【Results】Results show that nitrogen fertilizer and planting density have significant effects on the yield and agronomic traits of "Qunyou NO.2". With the increase of nitrogen fertilizer,the number of effective panicles increases,while the number of spikeletes,seed-setting rate and 1000-grain weight decreases,and the yield increases first and then decreases.The highest yield is recorded 7944 kg/hm^2 in the treatment with 240 kg/hm^2 nitrogen fertilizer; with the increase of planting density,the number of effective panicles increases,while the number of spikeletes,seed-setting rate and1000-grain weight decreases,and the yield increases first and then decreases.The highest yield is recorded8178 kg/hm^2 in the treatment with 300 000 plants/hm^2 in planting density.【Conclusion】"Qunyou NO.2"has high and stable yield.The highest yield is recorded in the treatment with 240 kg/hm^2 nitrogen fertilizer and 30 000 plants/hm^2 in planting density.