Effects of Nitrogen Application Rate on Grain Yield and Nitrogen Use Efficiency of Super Hybrid Rice Grown under Different Altitudes with Same Latitude in Sichuan Province
Received date: 2023-07-31
Online published: 2023-09-15
Field experiments were conducted at Hanyuan County (high altitude), Muchuan County (medium altitude) and Luxian County (low altitude) in Sichuan Province in 2022 in order to explore the effects of nitrogen (N) application rate on yield formation and N use efficiency (NUE) of super hybrid rice grown under different altitudes with same latitude. Super hybrid rice Luyou 727 and high yield hybrid rice Nei 6 you107 were grown under five N treatments (225、180、150、105、0 kg/hm2，named as N1、N2、N3、N4、N0, respectively). Grain yield, yield components, dry matter and NUE were measured for each rice cultivar. The results showed that there were a large difference in grain yield among the three locations. The grain yield of super hybrid rice was 62.1% and 84.1% higher at Hanyuan County than that at Luxian County and Muchuan County, respectively. The higher grain yield observed for Hanyuan County were attributed to higher panicle number, spikelets per panicle, pre- and post-heading biomass production, total biomass and harvest index. The responses of grain yield of super hybrid rice to N application rate varied with the altitudes. There were not significantly differences in grain yield of super hybrid rice among four receiving N treatments in Hanyuan County and Muchuan County. Grain yield of super hybrid rice under N1 treatment was 6.7% and 18.0% higher than that under N3 and N4 treatments, respectively, while the difference in grain yield of super hybrid rice between N1 and N2 treatment was relatively small. The agronomic efficiency of applied N (AEN) and partial factor productivity of applied N (PFPN) of super hybrid rice showed a significant increasing trend with the increasement of reduced N application rate. The AEN under N2, N3 and N4 treatments were higher than that under N1 treatment by 6.8%-27.1%, 27.9%-70.0% and 37.3%-138.6%, respectively; and the N2, N3 and N4 treatments produced higher PFPN than that the N1 treatment by 20.9%-25.5% and 40.5%-53.6% and 81.6%-118.8%, respectively. Comprehensively taken the grain yield and nitrogen use efficiency of super hybrid rice, the suitable reduction rate of N application is 20.0%-33.3% at Hanyuan County and Muchuan County, whereas the suitable reduction rate of N application is 20.0% at Luxian County.
Key words： super rice; N application rate; latitude; N use efficiency; grain yield
JIANG Peng, LUO Xiaolian, YE Mingdeng, XIAO Hong, LI Jinrong, ZHOU Xingbing, ZHANG Lin, ZHU Yongchuan, GUO Xiaoyi, LIU Mao, GUO Changchun, XIONG Hong, XU Fuxian . Effects of Nitrogen Application Rate on Grain Yield and Nitrogen Use Efficiency of Super Hybrid Rice Grown under Different Altitudes with Same Latitude in Sichuan Province[J]. China Rice, 2023 , 29(5) : 78 -84 . DOI: 10.3969/j.issn.1006-8082.2023.05.014
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