Effects of N Application Rate and Plant Density on Grain Yield and N Use Efficiency of Hybrid Rice with Heavy Panicle

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;  

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/hm~2, namely N0, N120, N165 and N210)and three plant densities(25.0, 19.1, 12.5 hills/m~2, namely D1, D2 and D3). The results showed that the 25.0 hills/m~2 of planting density was the optimum planting density. When the planting density was25.0 hills/m~2, the grain yield of Deyou 4727 was increased with the increasing of N application rate at first and decreased after N ap-plication rate exceeding 165 kg/hm~2, 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/hm~2) was in combination of N 165 kg/hm~2 and 25.0 hills/m~2. Wushansimiao obtained the highest grain yield(10.21 t/hm~2)in the combination of N 210 kg/hm~2 and 25.0 hills/m~2. 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 appli-cation rate of 165 kg/hm~2 and plant density of 25.0 hills/m~2 is the optimum combination.

【Fund】： 四川省农业科学院水稻高粱研究所青年基金
【CateGory Index】： S511

Download(CAJ format) Download(PDF format)

CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.