RESUMO A utilização de recursos derivados da própria propriedade agrícola para suprir necessidades dos produtores proporciona a redução de custos com insumos comerciais e a reciclagem de subprodutos, dentre eles, o resíduo líquido da produção de farinha de mandioca, denominado manipueira, que pode configurar-se como importante fonte de adubação. Objetivou-se avaliar o crescimento e a produção de Capsicum chinense Jacq., em função de doses de manipueira associada a proporções de adubo mineral. O estudo foi conduzido em casa-de-vegetação, em delineamento inteiramente casualizado, com os tratamentos distribuídos em esquema fatorial 3 x 5, sendo 3 doses (0, 50 e 100 %) da adubação mineral recomendada para a cultura e 5 doses (0, 25, 50, 100 e 150 m³ ha-1) de manipueira, com 4 repetições. As doses de manipueira influenciaram na produtividade da cultura, apresentando tendência linear. A dose de 150 m3 ha-1 proporcionou produtividade equivalente à obtida com a aplicação de 100 % da adubação mineral recomendada para essa cultura, permitindo, assim, a substituição parcial ou total dessa adubação pela manipueira.

ABSTRACT The use of resources derived from the agricultural property itself to meet the needs of producers promotes the reduction of costs with commercial inputs and recycling of by-products, among them the liquid waste from the cassava flour production, called cassava wastewater, which can be an important fertilization source. This study aimed to evaluate the growth and production of Capsicum chinense Jacq., as a function of cassava wastewater doses associated with mineral fertilizer proportions. The experiment was conducted in a greenhouse, in a completely randomized design, with treatments distributed in a 3 x 5 factorial scheme, corresponding to 3 doses (0, 50 and 100 %) of the mineral fertilization recommended for the crop and 5 doses (0, 25, 50, 100 and 150 m³ ha-1) of cassava wastewater, with 4 replicates. The cassava wastewater doses influenced the crop yield, showing a linear trend. The dose of 150 m3 ha-1 promoted a yield equivalent to that obtained with the application of 100 % of the mineral fertilization recommended for this crop, thus enabling the partial or total replacement of this fertilization by cassava wastewater.

ABSTRACT The objective of this work was to analyze the changes in the chemical attributes of an Ultisol irrigated with different dairy effluent dilutions. The experiment was set up using a randomized block design with five dilutions of dairy effluent (DE) in public water supply (PWS) (T1 - only PWS, T2 - 10% of DE plus PWS, T3 - 20% of DE plus PWS, T4 - 30% of DE plus PWS, and T5 - 40% of DE plus PWS). Soil samples were collected at five depths to quantify the attributes of pH, organic matter (OM), potassium (K), phosphorus (P) and electrical conductivity of the soil saturation extract (ECss). No significant effects of dairy effluent dilutions were found in altering the pH, OM and K+ values of the Ultisol after 240 days of application. However, there was a significant increase of P in T4, and of ECss mainly in the 0.10 to 0.20 m layer of T5.