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Journal of Agriculture ›› 2023, Vol. 13 ›› Issue (12): 1-7.doi: 10.11923/j.issn.2095-4050.cjas2023-0026

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Effects of Sowing Date, Density and Nitrogen Application on Yield and Component Factors of Dry Cultivation of Hybrid Rice

LI Yanlan1(), YANG Jincheng1(), LI Hongyang2, SHEN Xianghong1, ZHANG Zhong1, LI Xiang1, ZHU Zifen3, LI Zaofu4, LI Hongyun2, LIU Jianjian1, HU Xinzhou1, SHI Lanfen5, DENG Zheng1   

  1. 1 Yuxi Academy of Agricultural Sciences, Yuxi 653100, Yunnan, China
    2 Yuxi Agricultural Technology Extension Station, Yuxi 653100, Yunnan, China
    3 Eshan County Agricultural Comprehensive Service Center, Eshan 653200, Yunnan, China
    4 Yimen County Agricultural Technology Extension Station, Yimen 651100, Yunnan, China
    5 Tadian Town Agricultural Service Center of Eshan County, Eshan 653200, Yunnan, China
  • Received:2023-01-30 Revised:2023-05-16 Online:2023-12-20 Published:2023-12-19
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Abstract:

To screen the best dry land cultivation method of hybrid rice, a three factors and three levels orthogonal experiment was conducted to study the effects of sowing date, density, and nitrogen fertilizer application on the yield of transplanting hybrid rice with plastic film mulching after dry seedling cultivation, as well as the correlation analysis between main traits and yield. The results showed that as the sowing date was postponed from March 30th to April 20th, the total growth period of hybrid rice was shortened from 155 days to 148 days; there was a positive correlation between ear length, grain number per ear, actual grain number, seed setting rate, thousand grain weight, and yield, the correlation degree was as followed: seed setting rate>full grain number>ear length>grain number per ear>1000-grain weight; the direct path positive effects of main traits on yield was as followed: ear length>seed setting rate>effective ears>1000-grain weight>ear rate, while the negative effect of direct path was as followed: plant height>grain number per ear. Dry cultivation of hybrid rice could increase yield by increasing seed setting rate and panicle length, while controlling plant height. The order of influence of experimental factors on yield was as followed: sowing date>nitrogen application rate>density. The optimal high-yield cultivation combination for hybrid rice transplanted with film mulching in dry cultivation was: sowing on March 30th, 900000 basic seedlings per hectare, and tillering fertilizer of pure N 90 kg.

Key words: dry cultivation of hybrid rice, sowing date, density, nitrogen application rate, yield