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Table 2 Statistics of the linear regression analysis between color index b * and SPAD readings in different development stages and cultivars in 2011

From: Estimating rice chlorophyll content and leaf nitrogen concentration with a digital still color camera under natural light

   Vegetative Tillering Jointing Booting All stages
Liangyoupeijiu R2 0.74** 0.62** 0.92** 0.86** 0.80**
RMSEa 0.87 1.18 0.86 1.23 1.24
Nanjing45 R2 0.42** 0.28** 0.90** 0.79** 0.60**
RMSE 1.61 1.41 0.64 0.91 1.60
Nanjing46 R2 0.83** 0.52** 0.82** 0.83** 0.59**
RMSE 0.94 1.62 1.47 1.26 1.85
All cultivars R2 0.31** 0.64** 0.65** 0.61** 0.53**
  RMSE 1.94 1.66 1.87 2.59 2.23
  1. Dependent variable: SPAD.
  2. **indicate the significance at P < 0.01.
  3. aRoot mean square error.