Uso de lodo de esgoto na cana-de-açúcar como fonte de nitrogênio e fósforo: parâmetros de fertilidade do solo, nutrição da planta e rendimentos da cultura / Use of sewage sludge on soil planted with sugarcane as nitrogen and phosphorus source: soil fertility attributes, plant nutrition and yield

AUTOR(ES)

Marcio Koiti Chiba

DATA DE PUBLICAÇÃO

2006

RESUMO

The use of sewage sludge on land can improve soil fertility considering nitrogen, phosphorus and organic matter inputs. The aim of these experiments was to evaluate the effect of sewage sludge on soil, sugarcane plants and sugarcane yield in substitution to nitrogen and phosphorus from mineral fertilizers. The effect of the sewage sludge as a source of nitrogen was evaluated by an experiment carried in an Ultisol (Argissolo Amarelo) planted with the cultivar RB855536 during 2002/03 (first harvesting) and 2003/04 (2nd harvesting). The level of sewage sludge used in this experiment was 14 and 16 t ha-1, dry weigh basis, respectively on the yield 2002/03 and 2003/04. The application of N fertilizer was made, in treatments, after the sludge application, at rates of 0, 50 e 100% of the recommended level to sugarcane plantation (120 kg ha-1 of N). The other experiment, to evaluate the effectiveness of sewage sludge as phosphorus source to cane plants, was carried in an Ultisol (Argissolo Vermelho-Amarelo distrófico), and the cultivar used was the SP83-2847. The level of sewage sludge applied in all treatment, but control, in this experiment was 8,2 t ha-1, dry weight basis with the mineral-P fertilizer being applied in rates corresponding to 0, 25, 50, 75 e 100% of the total amount recommended to cane plants (180 kg ha-1 of P2O5). The data allows to conclude that sewage sludge application can supply the N requirement of sugarcane ratoons. The sewage sludge could only supply 25% of the total P recommendation for cane plants. There was not observed any harmful effects on soil, plants or juice quality due to the sewage sludge applied to soils.

ASSUNTO(S)

cana-de-açúcar waste fertilidade do solo nitrogen biosolid phosphorus nitrogênio biossólido lodo de esgoto soil fertility fósforo metal pesado do solo heavy metals

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