Produção de milho adubado residualmente com composto de lodo de esgoto e fosfato de Gafsa

Abstract

esgoto e fosfato natural de Gafsa sobre os teores de nutrientes no solo, na planta e na produtividade do milho. O trabalho foi realizado em Cambissolo Háplico. Os tratamentos, em esquema fatorial 2 x 4, corresponderam a 2 doses de fosfato de Gafsa (0 e 90 kg ha -1 de P 2 O 5 ) e 4 doses de composto de lodo de esgoto (0; 25; 50 e 75 t ha -1 , em base seca). O delineamento experimental utilizado foi em blocos casualizados, com 3 repetições. Em geral, a produtividade e os teores de nutrientes no solo e na planta no segundo cultivo sucessivo de milho não foram influenciados pela adubação com fosfato natural reativo. Entretanto, a produtividade de milho e os teores de nutrientes no solo e nas folhas de milho aumentaram com a dose de composto de lodo de esgoto ao solo, sendo a dose de 75 Mg ha -1 , a de maior efeito residual. A produtividade do milho é menor no segundo cultivo sucessivo em razão do empobrecimento do solo em fósforo e potássio, recomendando-se novas adubações com lodo de esgoto, a cada cultivo realizado. Palavras-chave: Zea mays, biossólido, fosfato natural reativoCorn yield response to residual effect of fertilization with sewage sludge compost and rock phosphate A B ST R A C T The aim of this study was to evaluate the residual effect of fertilization with sewage sludge compost and rock phosphate on the chemical properties of the soil, nutrient content in plant and corn yield. The study was conducted on Haplic Cambisol. The treatments, in a factorial 2 x 4, corresponded to two doses of Gafsa phosphate (0 and 90 kg P 2 O 5 ha -1 ) and four doses of sewage sludge compost (0, 25, 50 and 75 Mg ha -1 dry weight basis). The experimental design was in randomized blocks with three replications. In general, the corn yield and content of macronutrients in soil and plant on the second crop of corn were not influenced by the residual effects of fertilization with phosphate rock. However, corn yield and nutrient content in soil and leaves increased with the dose of sewage sludge compost applied to the soil, and the dose of 75 Mg ha -1 was the one with the highest residual effect. The yield of corn was lower in the second successive cultivation, due to the impoverishment of the soil phosphorus and potassium, recommending new fertilization with sewage sludge in every cultivation.

Residual effect of sewage sludge fertilization on sunflower yield and nutrition

“…These results corroborate those observed by Barbosa et al (2007) and Zuba Junio et al (2012), who observed a positive response in maize yield to the residual effect of sewage sludge application in the soil. According to Nascimento et al (2014), the increase in the yield of crops fertilized with sewage sludge is due to the improvement in soil chemical, physical and biological quality.…”

“…According to Zuba Junio et al (2012), the residual effects of sewage sludge fertilization influence the leaf contents of N, P and K, after one year of its application in the soil and two consecutive maize cycles. Still according to these authors, the contents of Mg and S remain below the amounts demanded by maize, which confirms the results obtained in this experiment and indicates the need for additional sewage sludge fertilization in each new cycle of sunflower.…”

Chemical attributes of the soil in agroforestry systems subjected to organic fertilizations

“…Increments on the Ca 2+ contents on the soil occurred because SS goes through a treatment with quicklime (CaO) or hydrated lime [Ca(OH) 2 ] during the chemical stabilization processes, and it becomes a byproduct with a high concentration of this element. These results are in agreement with Zuba Junio et al (2012), who observed increases on the Ca 2+ contents on the soil at 0 to 10 cm depths, with the use of SS, reaching contents of 5.49 cmol c dm -3 . The use of cattle manure (CM) showed low Ca 2+ contents on the soil when compared to SS, yet, it was statistically similar (p>0.05) to the control treatment (no fertilization).…”

“…The zinc contents (Zn 2+ ) showed an increase with high correlation on the SS fertilizations at the 0 to10 cm depth (p<0.05) (Table 3 and Figure 1). The increments on the Zn 2+ contents on the soil with the use of SS have been observed on several researches on tropical soils (Zuba Junio et al, 2012;Nascimento et al, 2014;Cavalcanti et al, 2015) and, depending on the chemical characteristic of this organic fertilizer, the supply of the micronutrient may reach levels higher than 4 kg ha -1 (Albuquerque et al, 2015).…”

Content of Heavy Metals in Soil and in Pineapple Fertilized With Sewage Sludge

“…The agricultural usage of sewage sludge or products from its stabilization is an important alternative for the reduction in production costs and to the increase of the productivity of several crops, since this residue promotes physical and chemical improvements of the soil due to its high levels of nutrients and organic matter (Nascimento et al, 2004;Lemainski & Silva, 2006;Zuba Junio et al, 2012;Ribeirinho et al, 2012).…”