Welcome to Journal of Agriculture,

Journal of Agriculture ›› 2022, Vol. 12 ›› Issue (12): 69-75.doi: 10.11923/j.issn.2095-4050.cjas2021-0082

Special Issue: 农业气象 农业生态

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Dynamic Prediction Method for Brassica juncea var. tumida Yield Based on Climatic Suitability Index

WU Qiang1,2,3(), NI Chao4, FAN Li1,2,3(), TANG Yuxue1,2,3, LUO Zizi1,2,3, FANG Li5, CAI Guoqiang6   

  1. 1Chongqing Institute of Meteorological Sciences, Chongqing 401147, China
    2Chongqing Engineering Research Center of Agrometeorology and Satellite Remote Sensing, Chongqing 401147, China
    3Chongqing Jiangjin Modern Agrometeorology Test Station, Chongqing 402260, China
    4Fuling Meteorological Bureau, Chongqing 408000, China
    5Wanzhou Meteorological Bureau,Chongqing 401220, China
    6Tongliang Meteorological Bureau, Chongqing 404500, China
  • Received:2021-04-30 Revised:2021-06-08 Online:2022-12-20 Published:2023-01-05
  • Contact: FAN Li E-mail:theodorus@yeah.net;fanli_0223@163.com

Abstract:

In this study, the dynamic yield prediction model of Brassica juncea var. tumida was established. Based on the climatic suitability index and the meteorological yield index, the supply and demand relationship between light, temperature, water and the key growth periods of Brassica juncea var. tumida was coupled by the dynamic yield prediction model. The meteorological data of different growth periods before the prediction date was used as reference data set. The results showed that the correlation between climatic suitability index and meteorological yield index from seedling stage to stem enlargement stage was better than the analysis results of the stem enlargement stage was considered only. The dynamic yield prediction model established by reference data set from seedling stage to stem enlargement stage had higher accuracy than that by reference data set of the stem enlargement stage. The average prediction accuracy of yield was 92.0%, the normalized root-mean-square-error was 0.196, and the average accuracy rate of the yield trend was 68.2% at different predication starting time. It indicated that the climatic suitability index considering the meteorological factors at seedling stage could better explain the influence of meteorological conditions on the yield formation, and the climatic suitability at seedling stage had a certain contribution to the yield formation. To test the dynamic yield prediction model based on the data from 2017 to 2019, the prediction accuracy of each year’s yield of Brassica juncea var. tumida was basically more than 90%. The dynamic yield prediction method based on climate suitability index could be used to predict the yield of Brassica juncea var. tumida with high accuracy and stability.

Key words: yield prediction, meteorological yield index, climatic suitability index, Brassica juncea var. tumida

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