The Effects of Organic Wastes on Soil and Cotton Quality with respect to the Risk of Boron and Heavy Metal Pollution

Table 4

The effect of treatments on the boron and heavy metal content of cotton leaves (dry weight basis) in the two experiments.

Year	Treatments	mg kg^−1
		B	Pb	Ni	Cr	Co	Cd
2003	Control	13	3.1	1.9	0.1	1.9	0.30
	Mineral fertilizer	16	5.4	2.3	0.4	2.0	0.20
	Oily cumin wastes	18	4.1	1.8	0.5	2.1	0.20
	Oily oregano wastes	18	5.1	1.5	0.3	1.9	0.20
	Oilless oregano wastes	17	5.6	1.7	0.4	2.3	0.20
	Minimum	13	3.1	1.5	0.1	1.9	0.20
	Maximum	18	5.6	2.3	0.5	2.3	0.30
	LSD	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
	2006	Control	15	4.3	1.9	0.16	1.4	0.14
Mineral fertilizer		16	3.9	2.4	0.06	1.1	0.20
Oily cumin wastes		17	4.3	2.0	0.22	1.5	0.23
Oily oregano wastes		15	3.4	1.6	0.16	0.9	0.15
Minimum		15	3.4	1.6	0.06	0.9	0.14
Maximum		17	4.3	2.4	0.22	1.5	0.23
LSD		n.s.	n.s.	n.s.	n.s.	n.s.	n.s.

Values are an average of three replicates. LSD: least significant difference method; n.s.: nonsignificant.