Impact assessment of organic farming on soil nutrients and heavy metal content


Citation

Azeez J. O., . and Ojewande B. O., . and Olayinka O. O., . and Adesodun J. K., . Impact assessment of organic farming on soil nutrients and heavy metal content. pp. 1811-1831. ISSN 1511-3701

Abstract

Environmental sustainability of recent adoption of organic farming as a wholesome practice in sub-Saharan Africa needs to be investigated in order to guide agricultural policy makers. Consequently an assessment of soil chemical properties was done in an organic farm with different land uses. The experiment was 5 3 factorial design (five land uses and three soil depths) replicated temporally (two contrasting seasons) and spatially (four replications). Samples collected systematically at 0 - 20 20 - 40 and 40 - 60 cm depths were analysed for pH organic carbon nutrients and heavy metals. Results indicated that manure application limed the soil. Soil pH ranged from 5.1 to 6.3 in grass-land and 5.8 to 6.4 in amaranth farm during dry and wet seasons respectively. Generally nutrients and heavy metals were concentrated at 0-20 cm depth. The effect of season on the parameters was erratic. Amounts of mobile exchangeable and labile Cu were 0.13 - 0.19 0.07 - 0.15 and 1.39 - 1.74 mg kg- respectively while water soluble and mobile fraction Zn ranged from 0.15 - 0.20 and 0.29 “ 0.62 mg kg-. Comparatively all the metals labile pool was most abundant while Pb was the most abundant metal. There was no evidence of heavy metal accumulation in the organic system.


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Abstract

Environmental sustainability of recent adoption of organic farming as a wholesome practice in sub-Saharan Africa needs to be investigated in order to guide agricultural policy makers. Consequently an assessment of soil chemical properties was done in an organic farm with different land uses. The experiment was 5 3 factorial design (five land uses and three soil depths) replicated temporally (two contrasting seasons) and spatially (four replications). Samples collected systematically at 0 - 20 20 - 40 and 40 - 60 cm depths were analysed for pH organic carbon nutrients and heavy metals. Results indicated that manure application limed the soil. Soil pH ranged from 5.1 to 6.3 in grass-land and 5.8 to 6.4 in amaranth farm during dry and wet seasons respectively. Generally nutrients and heavy metals were concentrated at 0-20 cm depth. The effect of season on the parameters was erratic. Amounts of mobile exchangeable and labile Cu were 0.13 - 0.19 0.07 - 0.15 and 1.39 - 1.74 mg kg- respectively while water soluble and mobile fraction Zn ranged from 0.15 - 0.20 and 0.29 “ 0.62 mg kg-. Comparatively all the metals labile pool was most abundant while Pb was the most abundant metal. There was no evidence of heavy metal accumulation in the organic system.

Additional Metadata

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Item Type: Article
AGROVOC Term: Organic farming
AGROVOC Term: Field experiments
AGROVOC Term: Manures (fertilizers)
AGROVOC Term: Soil chemicophysical properties
AGROVOC Term: Dry season
AGROVOC Term: Wet season
AGROVOC Term: Heavy metals
AGROVOC Term: Organic compounds
AGROVOC Term: Nutrient availability (soil)
AGROVOC Term: Soil alkalinity
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 24 Apr 2025 06:29
URI: http://webagris.upm.edu.my/id/eprint/24894

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