Co-composting of Olive Mill Waste and Wine-Processing Waste: An Application of Compost as Soil Amendment

Table 4

Physicochemical characteristics of produced composts.

Parameters	Compost A	Compost B	Compost C	NF U44-051
pH	7.02 ± 0.02	7.09 ± 0.03	8.30 ± 0.02	ND
CE mS·cm^−1	1.75 ± 0.02	3.04 ± 0.03	1.92 ± 0.03	ND
C/N	12.00 ± 1.23	13.45 ± 2.08	12.24 ± 1.15	>8
Minerals and fertilizing elements (mg/kg)
P	855.99	158.37	346.15	ND
K	2763.56	2368.35	2264.55	ND
Mg	897.68	901.90	810.35	ND
Ca	10153.95	9237.85	9760.55	ND
Fe	5414.84	5101.55	6121.70	ND
Na	225.67	259.65	309.45	ND
Mn	49.65	31.65	33.35	ND
Heavy metals (mg/kg)
Zn	57.83	11.6	12.2	600
Cu	22.26	5.95	6.55	300
Cr	9.35	7.60	5.95	12
Ni	<0.01	0.06	0.06	2
Cd	1.5	1.0	1.2	3
As	<0.01	<0.01	<0.01	18
Se	<0.01	<0.01	<0.01	12

ND: not determined.