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

Table 1

Chemical characteristics of tannery land plaster (TLP).

Parameter	Units	Value (all data are expressed on a dry matter basis)
Water content	(g kg^−1)	730*
Total solids (TS)	(g kg^−1)	270*
Ash	(g kg^−1)	660
Volatile solids (VS)	(g kg^−1)	90*
pH (in water)	pH	10.6
Electrical conductivity (EC)	(dS m^−1)	3.6*
Total organic carbon (TOC)	(%)	17
Total nitrogen (TN)	(g kg^−1)	57
NH4 ^+-N	(g kg^−1)	0.7
NO3 ^−N	(g kg^−1)	0.3
C : N ratio	—	3
Total P	(g kg^−1)	3.1
Total K	(g kg^−1)	0.24
Total S	(g kg^−1)	123
Total Ca	(g kg^−1)	175
Total Mg	(g kg^−1)	3.9
Total Na	(g kg^−1)	2.3
Total Fe	(mg kg^−1)	755
Total Cu	(mg kg^−1)	3.3
Total Zn	(mg kg^−1)	8.3
Total Mn	(mg kg^−1)	36
Total Co	(mg kg^−1)	9.6
Total Al	(mg kg^−1)	373
Total Cd	(mg kg^−1)	<1.0
Total Ni	(mg kg^−1)	1.6
Total Pb	(mg kg^−1)	<0.5
Total Cr	(g kg^−1)	52.0
Cr(VI)	(mg kg^−1)	<0.5

*Fresh matter.