Chromium accumulation in maize and cowpea after successive applications of composted tannery sludge

Autor: Ricardo Silva de Sousa, Luis Alfredo Pinheiro Leal Nunes, Aurenivia Bonifacio de Lima, Wanderley Jose de Melo, Jadson Emanuel Lopes Antunes, Ademir Sérgio Ferreira de Araujo
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Acta Scientiarum: Agronomy, Vol 40, Iss 1, Pp e35361-e35361 (2018)
Druh dokumentu: article
ISSN: 1807-8621
DOI: 10.4025/actasciagron.v40i1.35361
Popis: Chromium (Cr) accumulation in soil and plants has been reported after successive applications of tannery sludge, which is a matter of concern because Cr can promote environmental contamination and affect the food chain. In this study, we evaluated the growth of and Cr accumulation in maize and cowpea after seven years of consecutive applications of composted tannery sludge (CTS) under field conditions. The experiment consisted of application of CTS at five levels: 0 (control), 2.5, 5, 10, and 20 Mg ha-1 (dry basis). The growth of and Cr accumulation in maize and cowpea were evaluated at 75 and 65 days after plant emergence, respectively. CTS application increased the shoot biomass of maize and cowpea. Accumulation of Cr was similar for both plant species, with higher accumulation in roots. However, Cr accumulation in grains differed as the CTS doses increased; cowpea accumulated more Cr while maize did not accumulate more Cr in grains with higher CTS doses. In conclusion, application of CTS led to higher growth of maize and cowpea plants, and both species exhibited similar Cr accumulation in roots and shoots.
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