Purpose: The objective of this study was to evaluate the effects of the use of different swine wastewater (ARS) in electrical (CEes) and hydraulic (K0) conductivity in soil grown with tomato, as well as in tomato yeld. Method/design/approach: The literature review showed that studies have been based on the application of residues replacing evapotranspirometric demand, causing deleterious effects to soil and plants. Results and conclusion: the mineral fertilization was more effective in the ionization of the soil solution than the ARS, presenting higher values of Cees in relation to the treatments that receive smaller ARS slides and the K0 increased due to the contribution of salts and organic matter, resulting from mineral fertilization, irrigation and fertigation with ARS, which caused soil restructuring Research implications: main managerial, academic, and/or social contributions of the research. Originality/value: This study applies ARS slides based on nitrogen doses, as it is element in higher relative concentration, seeking to determine contents that may indicate higher ARS consumption and higher production..
Purpose: The aimed witch of this study was to evaluate the chemical changes in soil cultivated with Panicum maximum cv. Mombaça grass, when submitted to application of different doses of dairy effluent (ARL), with sodium as a limiting factor. Method/design/approach: Was applied ARL in an area cultivated with Panicum maximum cv. Mombaça grass in order to provide sodium at concentrations of 75, 150, 300 and 600 Kg ha-1. Soil samples were collected at different depths and times, having determined the active acidity (pH) and phosphorus (P), potassium (K), organic matter (MO) and cation capacity (CTC). Results and conclusion: Regarding the initial conditions, the pH, MO and CTC of the Soil Did not show significant Variations. However, there are reductions in P concentrations and increases in K concentration. For Environmental Conservation, the application of ARL providing 600 kg ha-1 year-1 sodium may become a Recommendation for treatment and reuse of these effluents, in relation to initial conditions, soil pH, MO and CTC did not show significant variations. However, there were reductions in P concentrations and increases in K concentration. For environmental conservation, the application of ARL providing 600 Kg ha-1 year-1 sodium may become a recommendation for treatment and reuse of these effluents. Research implications: In the relevant literature, a technical recommendation that restricts the application of effluents providing 150 kg ha-1 sodium, in halophyte cultures, has been used interchangeably, making it difficult to use this effluent. However, this research concluded that the dairy effluent can be used in the fertigation of Panicum maximum cv. Mombaça grass with application rate of up to 600 Kg ha-1sodium. Originality/value: This study indicates an increase in the amount of sodium to be delivered to the soil through the use of effluents.
A cama de aviário, é oriundo da produção aviária, que se não tratado de maneira adequada pode impactar negativamente o ambiente. Objetivou-se obter um substrato com cama de aviário compostada para oferecer uma alternativa a produção e crescimento de Eucalyptus camaldulensis. Esse material foi compostado e caracterizado quanto ao teor de macronutrientes, sendo utilizados nos dois ensaios experimentais: germinação de sementes e crescimento inicial das mudas de Eucalyptus camaldulensis. As sementes foram plantadas e preenchidas com substrato comercial e diferentes percentuais de camas de aviários compostadas, cujo tratamento controle foi o substrato a base de casca de pinus e vermiculita. Forneceu-se 100% e 200% da dose de nitrogênio recomendada para a cultura, tendo como tratamento controle vasos preenchidos com solo do cerrado e adubação mineral de modo a fornecer 25g de N/planta. Para o experimento de crescimento inicial utilizou-se o Delineamento Inteiramente Casualizado (DIC) com os tratamentos distribuídos em esquema fatorial 4x2x17 (4 tratamentos, 2 doses de nitrogênio e tempo). Essas apresentaram maiores teores de nitrogênio quanto maior foi número de lotes de aves alojadas sobre a mesma cama. As sementes tiveram germinação tardia para os tratamentos com camas de aviários nas proporções de 20% e 50% e as mudas não sobreviveram. Nos tratamentos com 100% com camas de aviários não houve germinação. O melhor tratamento foi a cama de aviário compostada com maior número de reutilizações e com 100% da dose de nitrogênio. Todas as mudas apresentaram bons índices de IQD indicando chance de sobrevivência no campo.
O aumento populacional e geração de resíduos sólidos urbanos, causam efeitos deletérios ao meio ambiente, quando disposto inadequadamente. Com objetivo de avaliar o grau de contaminação de alface americana (Lactuca sativa) por metais pesados, mudas de alface foram cultivadas em vasos preenchidos com apenas com solo e com solo mais material humificado, adicionando diferentes concentrações de cobre, zinco e níquel. As plantas foram submetidas à análise de absorção de metais. Os resultados permitiram concluir que, as plantas cultivadas em solo com determinada quantidade de metais podem adquirir um grau fitotóxico e, que a quantidade de matéria orgânica pode influenciar nessa absorção.
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