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1   RESUMO Com o intuito de alcancar maiores resultados na producao de cafe, cafeicultores comecaram a partir da decada de 1980, a fazer uso do processamento pos-colheita de cafe, a fim de garantirem uma qualidade superior de seu produto. Porem, com o processamento, houve o surgimento de outro problema: a agua residuaria de cafe (ARC), que passou a contaminar rios, ribeiroes, solos, lencois freaticos, etc. Este trabalho teve como objetivo utilizar a ARC na producao de mudas de cafe verificando sua viabilidade e se a ARC e capaz de suprir as necessidades das mudas com relacao ao potassio quando estas nao recebem cloreto de potassio no composto. O trabalho foi desenvolvido na Faculdade de Ciencias Agronomicas – UNESP, Botucatu-SP em uma casa de vegetacao localizada no Departamento de Engenharia Rural. O trabalho consistiu de dez tratamentos em um fatorial 5x2 (cinco proporcoes de agua residuaria de processamento pos-colheita do cafe — 0%, 25%, 50%, 75% e 100% — e presenca ou ausencia de cloreto de potassio no composto), com quatro repeticoes dispostas em delineamento inteiramente casualizados. A ARC foi aplicada a cada 48 horas com uma lâmina de 10 mm. Apos seis meses, foram avaliadas caracteristicas vegetativas das plantas e caracteristicas quimicas do composto e das plantas. Constatou-se que os tratamentos com a presenca de cloreto de potassio foram estatisticamente inferiores aos tratamentos que nao apresentavam KCl em seu composto quanto as caracteristicas vegetativas. Alem disso, com o aumento da dosagem de agua residuaria, houve um decrescimo nas caracteristicas vegetativas, porem um acrescimo nas caracteristicas quimicas do composto. Ademais, os tratamentos sem a presenca de KCl e com 0% e 25% de agua residuaria de cafe foram estatisticamente iguais, mostrando a viabilidade no uso da ARC na producao de mudas de cafe, desde que o composto nao contenha KCl e que a agua utilizada seja uma mistura de 25% de ARC com 75% de agua comum. Palavras-chave: reuso de agua, cafe, Coffea arabica L. USE OF WASTEWATER FROM COFFEE POST HARVEST PROCESS IN THE COFFEE PLANTS’ PRODUCTION 2   ABSTRACT Intending to achieve better results on coffee production, the coffee producers began, since the 80s, to process the coffee postharvest, in order to ensure product’s superior quality. However, with the processing, other problem appeared, the contamination of rivers, creeks, soil and water table from coffee wastewater (ARC). This paper had as main objective to use the ARC on the coffee plants’ production verifying its viability and if the ARC is able to supply the coffee potassium requirements when they don’t receive potassium chloride in the organic compound. The work was developed at Faculdade de Ciencias Agronomicas – UNESP, Botucatu-SP, in a greenhouse located at Departamento de Engenharia Rural. The work consisted of 10 treatments on a 5x2 factorial (5 wastewater proportions of coffee after the harvest processing — 0%, 25%, 50%, 75% and 100% — and potassium chloride presence or absence in the composition), with 4 repetitions with a  completely randomized statistical design. The ARC was applied each 48 hours in an irrigation depth of 10 mm. After 6 months, the plants’ vegetative characteristic had been evaluated as well the chemical characteristics of the compound and of the plants. We observed that the treatments with potassium chloride presence showed worse vegetative characteristics compared with treatments which did not have KCl in its composition. Moreover, with the increase of the wastewater dosage, it happened a decrease in the vegetative characteristics, however an addition in the chemical characteristics of the compound. Also, the treatments without KCl presence and with 0% and 25% of coffee wastewater had been statistically equal, showing the viability in the use of the ARC in the production of coffee plants, since the compound does not contain KCl and that the water used in the composition is a mixture of 25% of ARC with 75% of common water. Keywords : water reuse, coffee, Coffea arabica L.

UTILIZAÇÃO DE ÁGUA RESIDUÁRIA DO PROCESSO PÓS-COLHEITA DO CAFÉ NA PRODUÇÃO DE MUDAS DE CAFEEIRO