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| Titel: |
Minerals in Soils and Forages Irrigated with Secondary Treated Sewage Water in Sebele, Botswana |
| Auteur: |
A.A. Aganga S. Machacha B. Sebolai T. Thema B.B. Marotsi |
| Verschenen in: |
Journal of applied sciences |
| Paginering: | Jaargang 5 (2005) nr. 1 pagina's 155-161 |
| Jaar: |
2005 |
| Inhoud: |
Production of forage using treated sewage water is a viable practice internationally. However, there is not much information on the heavy metal content of such forages. This study was conducted to determine the effect of sewage water on soils and forages irrigated with treated sewage water at Botswana College of Agriculture `s farm. The study was conducted for a period of 120 days using established forage pastures of rye grass (Lolium multiflorum) and lucerne (Medicago sativa). Heavy metals determined were Fe, Mn, Cu, Zn, Ni, Pb and Cd. Generally the treated sewage water contained relatively low levels of heavy metals. Zn, Ni and Mn concentration were below the detectable levels. In the sewage water while soils and plants had low levels of heavy metals. Comparatively the soil and plants heavy metal levels were much higher than those in the water and the difference was significant (p<0.05). There was some low correlation between trace element contents in the water and soil. In addition there was some significant difference (p<0.05) in heavy metal concentration in sewage water between the months during which the analyses were done. However, the sewage water, soils and forage mineral concentrations were within the internationally allowable heavy metal concentration with respect to irrigation, soil loadings and animal feeds. |
| Uitgever: |
Asian Network for Scientific Information (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 45 van 80 gevonden artikelen
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