【作者】 秦俭； 蒋开锋； 张涛； 熊洪； 徐富贤； 郑家奎； 蒋鹏；

【Author】 QIN Jian;JIANG Kaifeng;ZHANG Tao;XIONG Hong;XU Fuxian;ZHENG Jiakui;JIANG Peng;Rice and Sorghum Research Institute,Sichuan Academy of Agricultural Sciences/Key Laboratory of Southwest Rice Biology and Genetic Breeding,Ministry of Agriculture;

【机构】 四川省农业科学院水稻高粱研究所/农业部西南水稻生物学与遗传育种重点实验室；

【摘要】 以重穗型杂交稻德优4727和轻穗型常规稻五山丝苗为材料,设置4个施氮量(0、120、165、210 kg/hm²,分别记为N₀、N₁₂₀、N₁₆₅、N₂₁₀)和3种移栽密度（25.0、19.1、12.5丛/m²,分别记为D₁、D₂、D₃）,于2016年在四川德阳进行大田试验,研究施氮量和移栽密度对重穗型杂交稻产量及氮肥利用率的影响。结果表明,参试水稻品种的适宜移栽密度均为25.0丛/m²,在此移栽密度下,重穗型杂交稻德优4727产量随施氮量的增加呈先增加后下降的趋势,以N₁₆₅处理产量最高（10.90t/hm²）,轻穗型常规稻五山丝苗产量随施氮量的增加呈升高趋势,以N₂₁₀处理产量最高（10.21t/hm²）;相同移栽密度下,参试水稻品种氮肥利用率随施氮量的增加呈下降趋势;随移栽密度的增加,参试水稻品种产量和氮肥利用率呈增加趋势。可见,提高移栽密度,减少施氮量可兼顾水稻高产和氮肥高效利用,其最佳肥密组合为施氮量165kg/hm²、移栽密度25丛/m²,即低氮密植可作为重穗型杂交稻高产高效栽培的关键技术。更多还原

【Abstract】 A field experiment was conducted to study the effects of nitrogen（N） rate and plant density on grain yield and N use efficiency of hybrid rice Deyou 4727 with heavy panicle,and conventional rice Wushansimiao with light panicle,under four N application rate(0,120,165 and 210 kg/hm²,namely N₀,N₁₂₀,N₁₆₅ and N₂₁₀)and three plant densities（25.0,19.1,12.5 hills/m²,namely D₁,D₂ and D₃）.The results showed that the 25.0 hills/m² of planting density was the optimum planting density.When the planting density was25.0 hills/m²,the grain yield of Deyou 4727 was increased with the increasing of N application rate at first and decreased after N application rate exceeding 165 kg/hm²,and the grain yield of Wushansimiao was increased with the increasing of N application rates.The highest grain yield of Deyou 4727（10.90 t/hm²） was in combination of N 165 kg/hm² and 25.0 hills/m².Wushansimiao obtained the highest grain yield（10.21 t/hm²）in the combination of N 210 kg/hm² and 25.0 hills/m².Under the same plant density,N use efficiency was decreased with the increasing of N application rates.Grain yield and N use efficiency was increased with the increasing of plant densities.It is a key technique for the high-yielding and high-efficiency cultivation of hybrid rice with heavy panicle.N application rate of 165 kg/hm² and plant density of 25.0 hills/m² is the optimum combination.更多还原