Efeito de resÃduos siderÃrgicos no cultivo de arroz inundado: comparaÃÃo de extratos e disponibilidade de elementos-traÃo.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

A greenhouse experiment was conducted to study the effect of the use of iron smelter residues (metallurgical scale, filter press mud and phosphate mud) on the rice productivity (Oryza sativa L.) under wet cultivation. This experiment was undertaken in a completely randomized block design with a 3  7 factorial scheme with three replicates. A Gleysol collected in Lavras-MG was utilized, where seven doses of each residue (0; 0,5; 1; 2; 4; 8 and 16 t ha-1) were applied and macro and micronutrients were supplied to the crop. The experimental units consisted of 4-L pots containing soil samples. Eighty days after the planting rice (cv. Curinga), the soils were flooded and thereafter a 5 cm water layer was maintained above the soil surface. The pH, oxidation-reduction potential (Eh), electrolytical conductivity (EC), and dissolved oxygen (OD) were measured periodically in situ. The effect of the use of iron smelter residues upon the available contents of Pb and Zn in soil, dry matter productions of shoot, grain and roots as well as the effects of these residues on nutrient content in rice plants and the possibility of contamination of the water table by both Pb and Zn were evaluated. The USEPA 3051A method was the most efficient method for extraction of Pb and Zn. None of the treatments affected the rice yield. Application of metallurgical scale and phosphate mud resulted in no movement of Zn and Pb into the soil profile. However, it was found that filter press mud may contaminate water tables with Pb.

ASSUNTO(S)

ciencia do solo

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