Phosphorus Sorption and Redistribution on Soil Solid Phase in a Brazilian Haplorthox Amended with Biosolids

Table 3

Linear Langmuir equations and parameters in the soil samples which received phosphorus addition as biosolids.

Phosphorus inputs	Regression Equations^(1)	R^2	𝑄max ^(2)	Binding energy	P0.2 ^(3)
kg ha^−1			mg kg^−1	L^−1 mg	mg kg^−1
0	Y = 5.51 + 0.82X	0.99**	1130	0.148	32,5
	SS from Franca
125	Y = 7.08 + 0.82X	0.99**	1074	0.116	24.4
500	Y = 7,79 + 0.82X	0.99**	1086	0.105	22.3
1000	Y = 9.91 + 0.83X	0.99**	1050	0.084	17.4
	SS from Barueri
250	Y = 8.21 + 0.88X	0.99**	1082	0.107	22.7
2000	Y = 11.22 + 0.81X	0.99**	1008	0.072	14.3

⁽¹⁾For single-surface Langmuir equation. Y=𝐶/𝑄, in g L⁻¹; X = equilibrium concentration, in mg L⁻¹.
⁽²⁾Sum of P sorption maximum of low-and high-energy sorbing sites derived from the two-surface Langmuir equation.
⁽³⁾P sorbed at equilibrium concentration of 0.2 mg L⁻¹.
**Significant at 𝑃<0.01 by F-test.
𝑄_max: maximum P sorption capacity.