Table 6.

Coefficients of determination (R²) of relationships obtained from simple regression analysis of the green pixel percentage obtained from the image analysis with the destructively obtained parameters nitrogen uptake, nitrogen concentration, biomass fresh and dry weight of wheat at individual measurements and for the combined measurements.

Dates	BBCH	Nitrogen uptake (kg ha-1)	Nitrogen concentration (%)	Biomass dry weight (kg ha-1)
29.03.2016	19	0.79∗∗∗	0.40∗∗∗	0.81∗∗∗
04.04.2016	22	0.73∗∗∗	0.16∗∗	0.77∗∗∗
All dates		0.92∗∗∗	0.60∗∗∗	0.72∗∗∗

^∗, ^∗∗, ^∗∗∗ Statistically significant at P ≤ 0.05, P ≤ 0.01, and P ≤ 0.001, respectively.