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Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (14): 1-10.doi: 10.11924/j.issn.1000-6850.casb2021-0286

Special Issue: 生物技术 水稻 农业生态

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Effects of Simplified Fertilization on Yield of Hybrid Rice Varieties in Mid-rice/Ratoon Rice System in No Tillage Winter Paddy Field

ZHANG Lin1,2(), ZHOU Xingbing1,2, LIU Mao1,2, JIANG Peng1,2, GUO Xiaoyi1,2, GAO Shangqing3, XU Wei3, LI Yanrong4, MEI Xiufeng4, ZHU Yongchuan1,2, XIONG Hong1,2, XU Fuxian1,2()   

  1. 1Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences/Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture and Rural Affaris, Deyang, Sichuan 618000
    2Luzhou Branch of National Rice Improvement Center, Luzhou, Sichuan 646100
    3Luxian Agricultural Technology Extension Center, Luxian, Sichuan 646100
    4Fushun Agricultural Technology Extension Center, Fushun, Sichuan 643200
  • Received:2021-03-22 Revised:2021-08-11 Online:2022-05-15 Published:2022-06-07
  • Contact: XU Fuxian E-mail:zhanglin1090@sina.com;xu6501@163.com

Abstract:

To explore the effects of simplified fertilization on yield and yield components of hybrid rice varieties in mid-rice/ratoon rice system in no tillage winter paddy fields, and to screen out high-yield varieties for production, field experiments were conducted in 2016-2017. 18 hybrid mid-rice varieties were selected as materials, under the condition of no tillage winter paddy field with the total nitrogen application rate of 120 kg/hm2, nitrogen was applied by two methods as simplified fertilization SF (basal application for one time, basal: tiller: panicle fertilizer as 10∶0∶0) and conventional fertilization CF (basal: tiller: panicle fertilizer as 5∶3∶2). The results showed that the effects of the two nitrogen application methods on the yield of the first crop, the ratoon crop and their total were not significant. The yield of the first crop, the ratoon crop and their total was 9.46 t/hm2, 1.50t/hm2 and 10.96 t/hm2 under SF, respectively, 1.40%, -6.77% and 0.20% higher than that of CF, respectively. There were significant differences of the first crop, the ratoon crop and their total among the 18 hybrid varieties, their yield variation range was 8.70-10.19 t/hm2, 0.59-2.29 t/hm2, 10.21-11.57 t/hm2, respectively. There was a significant negative correlation (r=0.61) between the yield of the first crop and that of the ratoon crop. The partial correlation coefficients between the total yield and effective panicles, spikelets per panicle, grain setting rate, 1000-grain weight of the first crop and effective panicles of the ratoon crop were extremely significant, and the regression equation was established. Therefore, the simplified fertilization method of one-time basal application is an effective way to achieve high yield and labor-saving in no tillage winter paddy field. The selection of varieties with consideration of panicle and grain is conducive to the realization of high yield of mid-rice/ratoon rice system. The varieties ‘Jingyou 727’, ‘Jing3you 177’, ‘Nei6you 103’ and ‘Nei6you 107’ with high yield and nitrogen partial productivity are selected, which can be popularized in the cultivation of mid-rice/ratoon rice system in the ecological region of the experiment.

Key words: simplified fertilization, yield, mid-rice/ratoon rice system, no tillage winter paddy field

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