Copper and zinc forms in soil fertilized with pig slurry in the bean crop/Formas de cobre e zinco no solo adubado com dejeto suino na cultura do feijao

• Published in: Revista brasileira de engenharia agrícola e ambiental 2016-09, Vol.20 (9), p.823
• Main Authors: Grohskopf, Marco A, Correa, Juliano C, Cassol, Paulo C, Nicoloso, Rodrigo S, Fernandes, Dirceu M
• Format: Article
• Language: English
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v20n9p823-829

The application of pig slurry may have different influence on copper (Cu) and zinc (Zn) dynamics in the soil compared with mineral fertilization. The aim of this research was to determine the different forms of Cu and Zn in soil and their uptake by bean plants in response to the application of mineral fertilizer and pig slurry (PS). The treatments were: mineral fertilizer (Cu and Zn oxides) and liquid pig slurry, at increasing rates (0/0, 1.7/6.0, 3.4/12.0 and 6.8/24.0 kg [ha.sup.-1] Cu/Zn, respectively) applied in a Rhodic Kandiudox. PS increased the Cu content in soil in the exchangeable form, Fe oxides and residual, while the mineral fertilizer increased Cu contents in the fraction associated with soil organic matter. Soil Zn contents in the fractions available, exchangeable and SOM were highest under mineral fertilization, while in the soluble fraction the contents were highest under PS. The fertilizers had not impact on Cu and Zn contents associated with Al oxides, and these elements were mostly associated with Fe oxides in the soil. PS promoted the highest biomass production in shoots and roots of the bean plants, reflecting in the highest accumulation of Cu and Zn. Key words: swine slurry uptake metals fractionation A aplicacao de dejeto suino pode ter influencia diferente na dinamica do cobre (Cu) e zinco (Zn) no solo em relacao a adubacao mineral. Objetivou-se, neste trabalho, determinar as formas de Cu e Zn no solo e sua absorcao pelas plantas de feijao em resposta a aplicacao de fertilizante mineral e dejeto suino, cujos tratamentos foram: fertilizante mineral (oxido de Cu/Zn) e dejeto suino (DS) em doses crescentes (0/0, 1,7/6,0, 3,4/12,0 e 6,8/24,0 kg [ha.sup.-1] de Cu/Zn, respectivamente) aplicados em Nitossolo Vermelho. O DS aumentou o teor de Cu no solo nas fracoes disponivel, trocavel, oxidos de Fe e residual enquanto o fertilizante mineral aumentou na fracao associada a materia organica do solo (MOS). O teor de Zn no solo nas fracoes disponivel, trocavel e MOS foi maior na aplicacao de fertilizante mineral enquanto na fracao soluvel foi maior com o DS. Os fertilizantes nao interferiram no teor de Cu nem no Zn ligados aos oxidos de Al sendo a maior parte associada aos oxidos de Fe no solo. O DS proporcionou maior producao de biomassa de parte aerea e raizes nas plantas de feijao refletindo no maior acumulo de Cu e Zn. Palavras-chave: esterco de suino absorcao fracionamento de metais