Skip to main content
Figure 4 | Plant Methods

Figure 4

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

Figure 4

Calibration of the four models in Table4for the estimation of leaf nitrogen concentration (LNC, g kg-1) and SPAD. Model 1 (a), LNC = αSPAD + βDAT + γ, model 2 (b), LNC = αb* + βDAT + γ, model 3 (c), SPAD = αb* + βDAT + γ, model 4 (d), SPAD = αb* + γ. Different colors denote different developmental stages (red: vegetative, green: tillering, blue: jointing, purple: booting). Different symbols denote different cultivars used for model calibration ( Liangyoupeijiu, ∆ Nanjing45, □ Nanjing46).

Back to article page