Leather Industry Solid Waste as Nitrogen Source for Growth of Common Bean Plants

Table 2

Chemical and physical soil characteristics before elephantgrass cultivation.

Characteristics	Determinations*
	EMBRAPA [19]	MEHLICH [20]	USEPA [21]
pH (H2O)	5.9 (0.05)
Al^3+ (cmolc dm^-3)	0.0 (0.02)
K^+ (cmolc dm^-3)		0.11 (0.01)
Ca^2+ (cmolc dm^-3)	4.0 (0.21)
Mg^2+ (cmolc dm^-3)	2.0 (0.14)
H^+ + Al^3+ (cmolc dm^−3)	3.0 (0.05)
O.C. (g kg^-1)	9.0 (0.08)
NTotal (g kg^-1)	30 (0.94)
N-NH4^+ (mg kg^-1)	35 (1.41)
N-NO3^− (mg kg^-1)	26 (1.25)
P (mg dm^-3)		8.0 (0.21)
Cu (mg dm^-3)		2.0 (0.08)	20 (0.94)
Fe (mg dm^−3)		3.0 (0.09)	42.238 (17.91)
Mn (mg dm^-3)		228 (3.30)	67 (3.56)
Zn (mg dm^-3)		34.5 (1.08)	20 (1.70)
Cr (mg dm^-3)		0.2 (0.17)	74 (5.91)
Clay (g dm^-3)	460 (0.47)
Silt (g dm^-3)	160 (0.94)
Sand (g dm^-3)	380 (0.47)

*Chemical methods: pH (H₂O, 1 : 2.5); Ca, Mg e Al (KCl 1 mol L⁻¹); H + Al (SMP); B (hot water); S (Ca(H₂PO₄)₂⋅H₂O in acetic acid); O.C (oxidation Na₂Cr₂O₇ 0,67 mol L⁻¹ + H₂SO₄ 5 mol L⁻¹).
Values are the mean of three replicates. Numeric values in brackets represent SD (standard deviation).