scholarly works in Crop Protection & Environmental Biology

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Author: search.filters.author.Togun, A. O.Subject: search.filters.subject.heavy metals

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    Field assessment of progressive remediation of soil contaminated with lead-acid battery waste in response to compost application
    (Scientific Research Publishing, 2011) Adejumo, S. A.; Togun, A. O.; Adediran, J. A.; Ogundiran, M. B.
    Addition of compost to heavy metal-contaminated soil has been employed to remediate contamination. Such rectification, however, depends on the type of compost and the contaminant involved. The efficacy of Mexican sunflower (MSC) and Cassava peel (CPC) composts applied at 0, 20 and 40 t/ha as well as inorganic fertilizer (NPK, 20:10:10) (100 kg N/ha) on the remediation of a battery waste-contaminated site in Ibadan, Nigeria was assessed. No compost or NPK fertilizer served as the control. The experimental design was a randomized complete block with 4 replicates. Soil analysis before and at 1, 2, 3 and 12 months after compost application was carried out. Mean lead (Pb) concentration (134,000 mg/kg) was high at this site. Twelve months after treatment, MSC and CPC applied at 40 t/ha had reduced the plant available lead concentration in the soil by 69 and 49%, respectively, whereas 20 t/ha had reduced the concentration by 58 and 34%, respectively. The relationships between soil lead and organic matter content (r = -0.75), phosphorous (r = -0.59) and pH (r = -0.77) were negative. NPK fertilizer had a limited effect (7% reduction) on Pb. Application of MSC at 40 t/ha brought about a remarkable reduction in Pb concentration.
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    Effects of compost application on remediation and the growth of maize planted on lead contaminated soil
    (International Union of Soil Sciences, 2010) Adejumo, S. A.; Togun, A. O.; Adediran, J. A.; Ogundiran, M. B.
    A field experiment was conducted in 2008 and 2009 to test for the effects of Mexican Sunflower (SW) and Cassava waste (CW) composts as well as inorganic fertilizer on the growth of maize planted on lead contaminated soil. Different application rates of 0t/ha, 20t/ha and 40t/ha were used for the two types of compost while inorganic fertilizer and 0t/ha were used as checks. The experiment was laid out in Randomized Complete Block Design with four replicates. It was observed that compost application increased significantly the vegetative and yield parameters of maize and performed better than inorganic fertilizer (P<0.05). Higher dose (40t/ha) of MSW compost gave the highest plant height, dry matter yield, leaf area and grain yield. More importantly, the experiment shows that there was a reduction in the final concentration of lead in soils of all the compost treated plots by 50-70%. Though, application of compost did not restrict the uptake of lead by the maize crop the concentrations were lower than those of control and inorganic fertilizer plants. Higher concentrations were also detected in the root than other plant parts. This method of remediation could be recommended for restoration of lead contaminated sites.