Table 2.

Results of the curve fitting procedure on the measured NH₄⁺, NO₃⁻ and PO₄³⁻ concentrations in the nutrient solutions (C (BG-11) – N:P = 35:1, T1 – N:P = 55:1, T2 – N:P = 14:1 and T3 – N:P = 28:1).

Nutrients	Type of fitting	General equation	Sample ID	Coefficient A	Constant B	R2
NH4+	linear	Y = A·x + B	C (BG-11)	−0.0023	1.9024	0.78
			T1	−0.0022	1.8509	0.75
			T2	−0.0023	1.9242	0.73
			T3	−0.0022	1.8509	0.75
NO3−	logarithmic	Y = A·ln(x) + B	C (BG-11)	−149.6700	2053.0943	0.93
			T1	−213.0298	3392.1577	0.94
			T2	−160.5128	2111.4061	0.97
			T3	−220.4516	3456.9899	0.94
PO43-	linear	Y = A·x + B	C (BG-11)	−0.0142	30.6059	0.74
			T1	−0.0206	31.6661	0.83
			T2	−0.0249	49.6813	0.97
			T3	−0.0293	54.6007	0.83