“…According to this mathematical model, the maximum estimated values of 0.41 and 0.17 cmol c dm -3 were obtained with SWW applications of 51.58 and 52.28 m 3 ha -1 , respectively. A quadratic response for the exchangeable contents of K + and Na + in the soil due to the application of SWW doses has also been observed by Bernardes (2017), as well as by Cabral et al (2011), for the exchangeable contents of K + . In contrast, Condé et al (2013) found no significant response with the application of SWW doses for the exchangeable contents of K + and Na + in the soil.…”
Section: Camentioning
confidence: 75%
“…The pH of the soil was not affected by the SWW, but there were significant differences in the means at the evaluated soil depths at 0.01 probability level (Table 3). The response of soil pH to the SWW application is highly variable, because some studies show no changes (CABRAL et al, 2011;CASSOL et al, 2012;BRUNETTO et al, 2012;MAGGI et al, 2013;HOMEM et al, 2014;SILVA et al, 2015;BERNARDES, 2017), some show an increase (SMANHOTTO et al, 2010;LOURENZI et al, 2011;PRIOR et al, 2015;DA ROS et al, 2017) and others show a decrease (VEIGA et al, 2012;OLIVEIRA;PINHEIRO;VEIGA, 2014).…”
Swine wastewater can be used as a biofertilizer and promote significant improvements in soil physical-chemical attributes and yield. The objective of this study was to evaluate the effects of swine wastewater application on soil and maize yield. The experiment was conducted at the Agricultural Sciences Center of the Federal University of Piauí, in Teresina, Piauí, Brazil, from August to November 2015. The experimental design used completely randomized blocks in split-plot scheme, with five doses of swine wastewater (0, 25, 50, 75 and 100 m3 ha-1) in the plots and two soil depths (0.20 and 0.40 m) in the subplots, with four replications. Exchangeable contents of calcium, magnesium, phosphorus, potassium and sodium, electrical conductivity, pH, sum of bases, base saturation, potential acidity and cation exchange capacity, and crop yield were evaluated. Results showed calcium, magnesium, sum of bases and cation exchange capacity increased with elevated levels of swine wastewater. Potassium and sodium contents however decreased with doses of 51.58 and 52.28 m3 ha-1, respectively. Except for potassium and potential acidity, variables showed higher values at the 0-0.20 m depth.
“…According to this mathematical model, the maximum estimated values of 0.41 and 0.17 cmol c dm -3 were obtained with SWW applications of 51.58 and 52.28 m 3 ha -1 , respectively. A quadratic response for the exchangeable contents of K + and Na + in the soil due to the application of SWW doses has also been observed by Bernardes (2017), as well as by Cabral et al (2011), for the exchangeable contents of K + . In contrast, Condé et al (2013) found no significant response with the application of SWW doses for the exchangeable contents of K + and Na + in the soil.…”
Section: Camentioning
confidence: 75%
“…The pH of the soil was not affected by the SWW, but there were significant differences in the means at the evaluated soil depths at 0.01 probability level (Table 3). The response of soil pH to the SWW application is highly variable, because some studies show no changes (CABRAL et al, 2011;CASSOL et al, 2012;BRUNETTO et al, 2012;MAGGI et al, 2013;HOMEM et al, 2014;SILVA et al, 2015;BERNARDES, 2017), some show an increase (SMANHOTTO et al, 2010;LOURENZI et al, 2011;PRIOR et al, 2015;DA ROS et al, 2017) and others show a decrease (VEIGA et al, 2012;OLIVEIRA;PINHEIRO;VEIGA, 2014).…”
Swine wastewater can be used as a biofertilizer and promote significant improvements in soil physical-chemical attributes and yield. The objective of this study was to evaluate the effects of swine wastewater application on soil and maize yield. The experiment was conducted at the Agricultural Sciences Center of the Federal University of Piauí, in Teresina, Piauí, Brazil, from August to November 2015. The experimental design used completely randomized blocks in split-plot scheme, with five doses of swine wastewater (0, 25, 50, 75 and 100 m3 ha-1) in the plots and two soil depths (0.20 and 0.40 m) in the subplots, with four replications. Exchangeable contents of calcium, magnesium, phosphorus, potassium and sodium, electrical conductivity, pH, sum of bases, base saturation, potential acidity and cation exchange capacity, and crop yield were evaluated. Results showed calcium, magnesium, sum of bases and cation exchange capacity increased with elevated levels of swine wastewater. Potassium and sodium contents however decreased with doses of 51.58 and 52.28 m3 ha-1, respectively. Except for potassium and potential acidity, variables showed higher values at the 0-0.20 m depth.
“…por Queiroz et al (2004), que verificaram aumento no teor de alumínio trocável e decréscimo do pH em solos que receberam esterco líquido de suínos. Por outro lado, Cabral et al (2011);Peles (2007) e Bernardes (2017) não observaram variações significativas nos valores de pH do solo para diferentes doses de dejetos líquidos de suínos.…”
Núcleo de Estudo e Pesquisa em Fitotecnia no município de Jataí, estado Goiás. A área experimental foi instalada em uma lavoura comercial de Soja cultivar Desafio RR. Este trabalho objetivou avaliar a eficiência de programas de pulverizações de fungicidas para o manejo das doenças prevalentes no sudoeste de Goiás, sob as condições de inoculação natural a campo e avaliar o posicionamento de Vessarya recomendado na primeira aplicação no estádio reprodutivo. O delineamento experimental foi em blocos casualizados com quatro repetições. Os fungicidas foram aplicados no estádio reprodutivo (R1, R3, R5.1 e R5.3). Foram levantadas variáveis tecnológicas, doenças de final de ciclo, ferrugem asiática da soja e nível de desfolha. A sequência de aplicações de fungicidas (Vessarya) => (Elatus+ Cypress+ Ochima) => (Cronnos+ Rumba) => (Aproach Prima+ Unizeb Gold+ Nimbus) aplicados preventivamente na floração (R1) e reaplicados em intervalos de 14 dias, pode ser recomendado para o controle de doenças no sudoeste de Goiás para as doenças de final de ciclo.
“…Entre os efeitos da associação do sistema plantio direto com o uso agrícola da ARS, destaca-se a possibilidade de aumentar a matéria orgânica (MO) e carbono orgânico (CO) do solo ao longo dos anos (BERNARDES, 2017). A literatura mostra que a adubação com dejetos de animais é mais eficaz no incremento dos teores de CO do que a fertilização mineral (YANG et al, 2005).…”
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