Doses of P (kg/ha)	Doses of Ca (kg/ha)	Doses of Mg (cmol/kg)	RDG correlation coefficients
Doses of P (kg/ha)	Doses of Ca (kg/ha)	Doses of Mg (cmol/kg)	DSP	Ca/Mg	Al	Fe
75	0	0	0.91^ns	−0.52^ns	−0.96^ns	0.85^ns
		25	0.68^ns	−0.65^ns	−0.87^ns	0.73^ns
		50	0.88^ns	−0.31^ns	−0.98^ns	0.90^ns
		75	0.90^ns	−0.30^ns	−0.99^ns	0.92^ns
	25	0	0.95^ns	−0.92^ns	−0.70^ns	0.27^ns
		25	0.96^ns	−0.21^ns	−0.99^ns	0.67^ns
		50	0.99*	−0.28^ns	−0.99^ns	0.67^ns
		75	0.99*	−0.26^ns	−0.99^ns	0.67^ns
	50	0	0.91^ns	−0.39^ns	−0.98^ns	0.62^ns
		25	0.86^ns	0.99^ns	−0.38^ns	0.97^ns
		50	0.99^ns	−0.21^ns	−0.40^ns	0.96^ns
		75	0.98^ns	−0.31^ns	−0.99^ns	0.68^ns
	75	0	0.96^ns	−0.34^ns	−0.99^ns	0.62^ns
		25	0.80^ns	0.35^ns	−0.75^ns	0.98^ns
		50	0.99^ns	−0.17^ns	−0.99**	0.62^ns
		75	0.99*	−0.30^ns	−0.99**	0.62^ns