Research Article
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.
|