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Table 2 Potato yield estimation models for single stage

From: Nondestructive estimation of potato yield using relative variables derived from multi-period LAI and hyperspectral data based on weighted growth stage

Growth stage

Regression equation

Adjusted R2

RMSE

Significance test

SS

y = 1.9752a1 − 0.1321

0.5912

0.3361

P < 0.001

y = 1.6494b1 + 0.0935

0.4064

0.4043

P < 0.001

TFS

y = 0.4626a2 − 0.1644

0.6423

0.3145

P < 0.001

y = 0.4223b2 − 0.0487

0.5661

0.3463

P < 0.001

TES

y = 0.4421a3 − 0.1823

0.7415

0.2671

P < 0.001

y = 0.4305b3 − 0.1747

0.7034

0.2864

P < 0.001

SAS

y = 0.3436a4 + 0.0572

0.7063

0.2844

P < 0.001

y = 0.3494b4 + 0.0593

0.6835

0.2956

P < 0.001

HS

y = 0.3269a5 + 0.0961

0.4692

0.3835

P < 0.001

y = 0.3984b5 − 0.0706

0.5174

0.3654

P < 0.001

  1. a1, a2, a3, a4, a5 are plot-level rVI (CIred edge in this study) at SS, TFS, TES, SAS, and HS, respectively
  2. b1, b2, b3, b4, b5 are plot-level rLAI at SS, TFS, TES, SAS, and HS, respectively