This work aimed to evaluate the impacts on leachate from drainage lysimeters receiving application of different rates of pig farming residual water (PRW) during soybean crop cycle. The experiment was conducted at the Agricultural Engineering Experimental field of UNIOESTE. The soil was classified as Rhodic Ferralsols. There were twenty-four drainage lysimeters where soybean cultivar CD 214 was sown. Four PRW rates (0; 100; 200 and 300 m 3 ha -1) were applied to the soil seven days before sowing in a single application combined with two fertilizations (with and without recommended dose) during sowing, and three repetitions per treatment. Three leachate collections were carried out in each experimental plot. The first was conducted 40 days after sowing (DAS); the second at 72 DAS, and the third at the end of crop cycle (117 DAS). pH, calcium, magnesium, potassium, phosphorus, and total nitrogen were evaluated. Based on the results, it was possible to observe that pH and Mg values in the leachate did not suffer influence of PRW application and fertilization. K + , P and Ca +2 in the leachate were higher for higher PRW rates.
ABSTRACT:The aim of this study was to evaluate the possible impacts caused in the soil and in the percolate in lysimeters of drainage with application of different rates of swine wastewater (SW) during the cycle of soybean culture and to assess the productivity of it. The experiment was conducted at the Agricultural Engineering Experimental Center of UNIOESTE. The soil was classified as typical Distroferric Red Latosol. There were twenty-four drainage lysimeters in the area in which the soybean was cultivated, cultivar CD 214. Four SW depths (0; 100; 200 and 300 m 3 ha -1 ) were applied to the soil seven days before the sowing in a single application combined with two mineral fertilizations in the sowing (with and without recommended fertilization during sowing), and three repetitions per treatment. It was realized three collections of percolate in each experimental portion, the first was conducted 40 days after sowing (DAS); the second at 72 DAS, and the third at the end of crop cycle (117 DAS). It was evaluated in the percolate the pH, calcium, magnesium, potassium, phosphorus, and total nitrogen. Based on the results, it was possible to observe that the level of K, P and N in the soil increased according to the increase of SW rates. The levels of K and P in the percolate were higher for higher rates of SW. The productivity was not influenced by the application of SW or by fertilization.KEYWORDS: lysimeters, effluent, soil pollution. IMPACTO DA APLICAÇÃO DE ÁGUA RESIDUÁRIA DE SUINOCULTURA NO PERCOLADO E NO SOLO CULTIVADO COM SOJARESUMO: Este trabalho teve como objetivos avaliar os possíveis impactos causados no solo e no percolado em lisímetros de drenagem com a aplicação de diferentes taxas de água residuária de suinocultura (ARS) durante o ciclo da cultura da soja, bem como avaliar a produtividade da mesma. Conduziu-se o experimento no Núcleo Experimental de Engenharia Agrícola da UNIOESTE, cujo solo foi classificado como Latossolo Vermelho distroférrico típico. Na área, havia vinte e quatro lisímetros de drenagem, nos quais se semeou a cultura da soja, cultivar CD 214. Foram aplicadas ao solo quatro lâminas de ARS (0; 100; 200 e 300 m 3 ha -1 ) sete dias antes da semeadura, em uma única aplicação, combinadas com duas adubações minerais na semeadura (com adição e sem adição da adubação recomendada na semeadura) e três repetições por tratamento. Realizaram-se três coletas do percolado em cada parcela experimental, a primeira aos 40 dias após a semeadura (DAS), a segunda aos 72 DAS e a terceira no final do ciclo da cultura (117 DAS). Avaliaram-se no percolado e no solo, o pH, cálcio, magnésio, potássio, fósforo e nitrogênio total. Com base nos resultados, observou-se que os teores de K, P e N no solo aumentaram de acordo com o aumento das taxas de ARS. As concentrações de K e P no percolado foram maiores para taxas mais elevadas de ARS. A produtividade não foi influenciada pela aplicação de ARS e pela adubação.
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