Attributes of the soil fertilized with sewage sludge and calcium and magnesium silicate

Abstract

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.

Productivity and nutrition of castor bean fertilized with sewage sludge stabilized by different processes

“…Although one of the benefits of sewage sludge is the increase in soil organic matter, in tropical regions such as Brazil, degradation of organic matter occurs very quickly (Alburquerque et al, 2015;Cavalcanti et al, 2015;Zuba Junio et al, 2015). Thus, its permanence in the soil is temporary, and therefore, in some studies its content was reported to not increase with the application of sewage sludge (Maio et al, 2011;Ribeirinho et al, 2012;Nascimento et al, 2014;Martins et al, 2015).…”