Soil Application of Tannery Land Plaster: Effects on Nitrogen Mineralization and Soil Biochemical Properties

Table 2

Main physical and chemical characteristics of the two soils (M and P).

Parameter	Units	Soil
		M	P
Sand	(g kg^−1)	330	340
Silt	(g kg^−1)	510	500
Clay	(g kg^−1)	160	160
Water holding capacity (WHC)	(g kg^−1)	310	280
pH (in water)	—	8.3	7.9
Total calcium carbonate (CaCO3)	(g kg^−1)	15	20
Cation exchange capacity (CEC)	(cmolc kg^−1)	26	25
Total organic C (TOC)	(g kg^−1)	10.6	7.7
Total Kjeldahl N (TKN)	(g kg^−1)	1.1	0.91
C : N ratio	—	10	8.5
Olsen-P	(mg kg^−1)	18	42
Total Mn	(mg kg^−1)	42	40
Total Cr	(mg kg^−1)	25	23
Extractable Cr	(mg kg^−1)	0.63	0.57
Cr(VI)	(mg kg^−1)	<0.5*	<0.5*

*Detection limit.