Use of a Digital Camera to Monitor the Growth and Nitrogen Status of Cotton

Table 5

Fitted parameters and goodness of fit for calibration equations linking canopy cover in experiment 1 with aboveground total N content, LAI, and aboveground biomass using (1). Validation refers to the goodness of fit for the three equations applied to canopy cover measured at three sites in experiment 2.

	Crop property	Equation	RMSE	𝑅^2
Calibration	Aboveground total N content	𝑌=0.619𝑒^4.262×CC	1.479 g m^−2	0.978
	Leaf area index	𝑌=0.448𝑒^2.631×CC	0.287 m^2 m^−2	0.935
	Aboveground biomass	𝑌=36.297𝑒^4.172×CC	134.412 g m^−2	0.901
Validation	Aboveground total N content		1.631 g m^−2	0.926
	Leaf area index		0.675 m^2 m^−2	0.842
	Aboveground biomass		170.156 g m^−2	0. 827