Effects of municipal solid waste compost and mineral fertilizer amendments on soil properties and heavy metals distribution in maize plants (Zea mays L.) |
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Authors: | Carbonell Gregoria de Imperial Rosario Miralles Torrijos Manuel Delgado Mar Rodriguez José Antonio |
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Institution: | a Laboratory for Ecotoxicology, Department of the Environment, INIA, Spain b Laboratory of Depuration and Agricultural Use of Animal Manure and Urban Waste, INIA, Spain c Department of Ecology and Forest Genetics, CIFOR-INIA, Spain |
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Abstract: | Soil amendments based on crop nutrient requirements are considered a beneficial management practice. A greenhouse experiment with maize seeds (Zea mays L.) was conducted to assess the inputs of metals to agricultural land from soil amendments. Maize seeds were exposed to a municipal solid waste (MSW) compost (50 Mg ha−1) and NPK fertilizer (33 g plant−1) amendments considering N plant requirement until the harvesting stage with the following objectives: (1) determine the accumulation of total and available metals in soil and (2) know the uptake and ability of translocation of metals from roots to different plant parts, and their effect on biomass production. The results showed that MSW compost increased Cu, Pb and Zn in soil, while NPK fertilizer increased Cd and Ni, but decreased Hg concentration in soil. The root system acted as a barrier for Cr, Ni, Pb and Hg, so metal uptake and translocation were lower in aerial plant parts. Biomass production was significantly enhanced in both MSW and NPK fertilizer-amended soils (17%), but also provoked slight increases of metals and their bioavailability in soil. The highest metal concentrations were observed in roots, but there were no significant differences between plants growing in amended soil and the control soil. Important differences were found for aerial plant parts as regards metal accumulation, whereas metal levels in grains were negligible in all the treatments. |
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Keywords: | MSW compost Chemical fertilizer Land application Available metals Plant uptake Zea mays |
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