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《Chinese Journal of Rice Science》 2019-01
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Optimizing the Nitrogen Management for Yongyou 4949 and Chaoyou 1000 in Ratoon Rice System in Central China

HE Aibin;YU Pengchao;CHEN Qian;JIANG Guanglei;WANG Weiqin;NIE Lixiao;Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, MOA, P.R. China, College of Plant Science and Technology, Huazhong Agricultural University;Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, MOA, P.R. China,College of Plant Science and Technology, Huazhong Agricultural University;Hubei Collaborative Innovation Center for Grain Industry, Yangtze University;  
【Objective】The grain yield, nitrogen partial factor productivity(PFPN) and regeneration rate of Chaoyou 1000(CY1000) and Yongyou 4949(YY4949) were investigated in ratoon rice system under various nitrogen rates. And the possibilities of introducing these varieties into ratoon rice system in central China were also evaluated.【Method】The experiment was laid out in a split-plot design with four replications. The nitrogen rates were designed as main plots with six levels: N_1(120_(main)150_(ratoon)), N_2(120_(main)225_(ratoon)), N_3(185_(main)150_(ratoon)), N_4(185_(main)225_(ratoon)), N_5(250_(main)150_(ratoon)), N_6(250_(main)225_(ratoon)). The varieties [YY4949, CY1000, Liangyou 6326(LY6326, as control)] were set as sub-plots. The plant height, tiller numbers, leaf area index, aboveground biomass, grain yield, yield components and grain nitrogen concentration of each variety were measured under various nitrogen rates.【Result】The highest grain yields in the main season were 9.16t/hm~2, 9.08t/hm~2 and 11.15t/hm~2 at the N levels of 185 kg/hm~2, 120 kg/hm~2 and 185 kg/hm~2 in LY6326, CY1000 and YY4949, respectively.The average yields of LY6326, YY4949 and CY1000 in ratoon season were 5.41t/hm~2, 4.98t/hm~2, 6.02t/hm~2 and 5.78t/hm~2, 5.41t/hm2, 6.49t/hm~2 at the nitrogen levels of 225kg/hm~2 and 150kg/hm~2, respectively. Moreover, the increases in nitrogen input(from 150 to 225kg/hm~2) significantly decreased the PFPN. In summary, it suggested that the optimum nitrogen management for LY6326 and YY4949 should be N_3(185kg/hm~2 during main season and 150kg/hm~2 during ratoon season).【Conclusion】The N management practice of YY4949 should be consistent with that of LY6326 when YY4949 was introduced into ratoon rice system, while the whole growth duration of CY1000 was too long to ensure maturity of ratoon season, so it is not suitable for ratoon rice production in Central China.
【Fund】: 国家自然科学基金资助项目(31371571);; 国家863计划资助项目(2014AA10A605);; 中央高校基本科研业务费专项资金资助项目(2662017JC001)
【CateGory Index】: S511
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