the collective treatment contributed to reducing the rate of positivity in endemic areas.
A B S T R A C TThis study aimed to evaluate the chemical attributes of an Inceptisol cultivated with castor bean (Ricinus communis L.), variety 'BRS Energia' , fertilized with sewage sludge compost and calcium (Ca) and magnesium (Mg) silicate. The experiment was conducted at the ICA/ UFMG, in a randomized block design, using a 2 x 4 factorial scheme with three replicates, and the treatments consisted of two doses of Ca-Mg silicate (0 and 1 t ha -1) and four doses of sewage sludge compost (0, 23.81, 47.62 and 71.43 t ha -1 , on dry basis). Soil organic matter (OM), pH, sum of bases (SB), effective cation exchange capacity (CEC (t) ), total cation exchange capacity (CEC (T) ), base saturation (V%) and potential acidity (H + Al) were evaluated. There were no significant interactions between doses of sewage sludge compost and doses of Ca-Mg silicate on soil attributes, and no effect of silicate fertilization on these attributes. However, fertilization with sewage sludge compost promoted reduction in pH and increase in H + Al, OM and CEC. The dose of 71.43 t ha -1 of sewage sludge compost promoted the best soil chemical conditions.Atributos do solo adubado com lodo de esgoto e silicato de cálcio e magnésio R E S U M O Objetivou-se, neste trabalho, avaliar os atributos químicos de um solo cultivado com mamona (Ricinus communis L.) variedade BRS Energia, adubada com composto de lodo de esgoto e silicato de cálcio e magnésio. O experimento foi conduzido no ICA/UFMG em Cambissolo Háplico, em esquema fatorial 2 x 4, no delineamento em blocos casualizados com três repetições. Este arranjo consistiu em duas doses de silicato de cálcio e magnésio (0 e 1 t ha -1 ) e quatro doses de composto de lodo de esgoto (0; 23,81; 47,62 e 71,43 t ha -1 , em base seca). Foram avaliados o teor de matéria orgânica, pH, Soma de Bases (SB), CTC efetiva (t), CTC potencial (T), saturação por base (V%) e a acidez potencial (H + Al) do solo. Não foram constatadas interações significativas entre as doses de composto de lodo de esgoto e as de silicato de cálcio e magnésio sobre os atributos edáficos do solo e tampouco houve efeito da adubação com silicato sobre esses atributos; no entanto, a adubação com composto de lodo de esgoto promoveu a redução do pH e o aumento da acidez potencial, do teor de matéria orgânica e da capacidade de troca catiônica, sendo a dose de composto de lodo de esgoto de 71,43 t ha -1 a que promoveu melhores condições químicas para o solo.
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