Bioavailability and Solubility of Heavy Metals and Trace Elements during Composting of Cow Manure and Tree Litter

Table 2

Physicochemical variables of raw materials used in the evaluation stage composting (n = 6).

Physicochemical variable	Tree litter (TREE-L)	Cattle manure (COW-M)
	P 1-6 (mean ± st. dev.)	P 1-6 (mean ± st. dev.)
pH <1/5>	6.62 ± 0.12	7.77 ± 0.14
H (%)	37.21 ± 2.04	16.46 ± 1.19
EC <1/5> (dS m^−1)	6.40 ± 0.89	14.17 ± 0.80
TOC (%)	29.01 ± 4.36	36.41 ± 2.02
TN (%)	1.45 ± 0.10	2.16 ± 0.11
C/N	20.14 ± 3.16	16.87 ± 1.34
HA (%)	1.61 ± 0.40	2.33 ± 0.31
FA (%)	2.04 ± 0.66	3.56 ± 0.28
NH4^+-N (mg kg^−1)	4.49 ± 0.22	2.30 ± 0.23
OM (%)	59.06 ± 3.82	74.25 ± 0.92