Response of Amaranthus Cruentus to Some Amendments on a Sandy-Loam Alfisol Contaminated by Heavy Metals
Keywords:
Contamination, Heavy metals, Amaranth, Industrial waste, Metal uptake, FertilizersAbstract
Indiscriminate dumping of industrial wastes often leads to heavy metal accumulation in soils but organic matter amendments may ameliorate the resulting toxicity in crop production. This study evaluated the effectiveness of eight fertilizer treatments (Control; Urea, U; Organic Fertilizer, OF; Single Superphosphate, SSP; SSP+U; OF+U and OF+SSP; OF +SSP+U) in reducing heavy metal uptake by Amaranthus cruentus (L) on contaminated alfisols .Treatments were replicated three times in completely randomized design. Sole and combined treatments (organic and/or inorganic) significantly (p<0.05) enhanced crop performance while heavy metal tissue concentration and uptake by plants were low compared to Control. Plants treated with OF+U gave the least concentration of tissue Pb (647.00 mg/kg), Zn (198.50 mg/kg) and Cu (16.50 mg/kg) while control plants had the highest corresponding values of 2562.50 mg/kg, 695.00 mg/kg and 66.00 mg/kg. Mineral fertilizer-fortified organic manures have great potential in the production of amaranth plants devoid of heavy metal poisoning.
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