APROVEITAMENTO DA ÁGUA DO PROCESSAMENTO DOS FRUTOS DE CAFÉ NA FERTIRRIGAÇÃO DE Brachiaria mutica

Considerando que a aplicacao da agua do processamento de cafe (APC), via fertirrigacao, pode promover alteracoes nos teores de K do solo, na planta e na producao de massa seca do Brachiaria mutica (Capim Angola), realizou-se um trabalho com o objetivo de avaliar os teores disponiveis de K no perfil de um Neossolo Fluvico, na planta, e na producao de massa seca do capim angola decorrentes da aplicacao de diferentes doses de APC. As parcelas receberam cinco tratamentos sendo: doses de APC 0, 57, 114, 171 e 228m³/ha, calculados de forma que a dose 114m³/ha elevasse o teor de K a 5% na CTC (T) do solo. Foram coletadas amostras de solo, aos 45 e 90 dias apos a aplicacao da APC, nas profundidades de 0 a 20 cm; 20 a 40 cm; 40 a 60 cm e 60 a 80 cm. Realizado tambem coletas, no mesmo periodo, de amostras para analise foliar e de massa seca. O uso da APC, na dose de 114 m³/ha promoveu incremento de K no solo apenas na camada de 0-20 cm. Observou-se ainda incremento em camadas inferiores mediante dosagens superiores. Nao houve diferenca na producao de biomassa e teores de nutrientes na planta, mediante os diversos tratamentos. Palavras-chave: pos-colheita; nutricao; lixiviacao; potassio.   Use of water for processing coffee beans in the fertigation of Brachiaria mutica   ABSTRACT: Considering that the application of water from coffee processing (WCP), via fertigation, can promote changes in the K content of the soil, in the plant and the production of the dry mass of Brachiaria mutica (Capim Angola), work was carried out to evaluate evaluating the available levels of K in the profile of a Floss Neossol, in the plant, and the production of the dry mass of the Angola grass resulting from the application of different doses of WPC. The plots received five treatments: WPC doses 0, 57, 114, 171, and 228m³ / ha, calculated so that the 114m³ / ha dose raised the K content to 5% in the CTC (T) of the soil. Soil samples were collected at 45 and 90 days after WPC application, at depths of 0 to 20 cm; 20 to 40 cm; 40 to 60 cm and 60 to 80 cm. Samples for leaf analysis and dry mass were also collected in the same period. The use of WPC, at a dose of 114 m³ / ha, increased K in the soil only in the 0-20 cm layer. An increase was also observed in lower layers through higher dosages. There was no difference in the production of biomass and nutrient contents in the plant, through the different treatments. Keywords: Post-harvest; nutrition; leaching; potassium.