›› 2016, Vol. 28 ›› Issue (10): 1790-1795.DOI: 10.3969/j.issn.1004-1524.2016.10.22

• Biosystems Engineering • Previous Articles     Next Articles

Study on northern japonica rice yield model based on canopy date of NDVI

XU Tong-yu1, 2, HONG Xue2, CHEN Chun-ling1, 2, *, ZHOU Yun-cheng1, 2, CAO Ying-li1, 2, YU Feng-hua2, LI Na2   

  1. 1. Agricultural Information Engineering Technology Center in Liaoning Province, Shenyang Agricultural University, Shenyang 110161, China;
    2. College of Information and Electrical Engineering, Shenyang Agricultural University, Shenyang 110161, China
  • Received:2016-03-16 Online:2016-10-15 Published:2016-11-20

Abstract: In the present study, experimental field in Shenyang Agricultural University was selected as study region, and unmanned aerial vehicle (UAV) remote sensing technology and manual analysis was combined to collect canopy NDVI data of the whole growth of japonica rice in the summer of 2015. Firstly, dual distance variable correlation analysis was applied to reveal the relationships between NDVI data of single day, ten day or each month and yield. Then, the yield and NDVI data which showed good correlations were adopted to build models via linear regression and Square or Cubic curve, and validation test of the constructed regression model and precision comparison were carried out. It was shown that it was better to build model with Square or Cubic curve than linear regress when only one variable was used. The model consisted of data collected in June 11th to 20th and August 1st to 10th was ideal to predict the yield, of which the determination coefficient (R2), relative error(RE), and root mean square error (RMSE) were 0.771, 4.06% and 0.474 t·hm-2, respectively. It was of high precision and feasibility. Thus, it was suggested that the most suitable time for japonica rice yield prediction in Northern China was June 11th to 20th and August 1st to 10th.

Key words: japonica rice, NDVI, correlation, regression analysis

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