Production of Piptadenia stipulacea Ducke irrigadas com agua residuaria da piscicultura

The objective of this study was to evaluate the growth of 'jurema-branca' seedlings (Piptadenia stipulacea (Benth.) Ducke.), irrigated with effluent from fish farming in order to meet the nutritional demand in the initial growth stage. The treatments consisted in the dilution of fish farming wastewater in different concentrations (0, 25, 50, 75 and 100%) with supply water. Seeds were sown in 0.9-L polyethylene bag containing a mixture of soil and manure. At 54 days after sowing the shoot length, stem diameter, height/diameter ratio, number of leaves, leaf area, unit leaf area, dry matter of stem, leaves, shoots, roots and total, chlorophyll content index and Dickson quality index were evaluated. The growth of 'jurema-branca' seedlings is favored by the dilution of 25% of fish farming wastewater in the supply water. Using up to 25% of the concentration of the fish farming effluent does not significantly affect the dry biomass accumulation in 'jurema-branca' seedlings, in relation to the control. The reuse of fish farming wastewater diluted at proportion of up to 25% is a viable alternative to meet the water demand in the production of forest seedlings. Key words: 'jurema-branca' water reuse propagation Objetivou-se, com este trabalho, avaliar o crescimento de mudas de jurema-branca (Piptadenia stipulacea (Benth.) Ducke.), irrigadas com efluente da piscicultura visando suprir a demanda nutricional na fase inicial de crescimento. Os tratamentos se constituiram da diluicao de agua residuaria da piscicultura em diferentes concentrates (0, 25, 50, 75 e 100%) com agua de abastecimento. A semeadura foi realizada em saco de polietileno de 0,9 L contendo uma mistura de solo e esterco. Aos 54 dias apos a semeadura foram avaliados o comprimento da parte aerea, o diametro do caule, a razao altura/diametro, o numero de folhas, a area foliar, a area foliar unitaria, a massa seca do caule, da folha, da parte aerea, da raiz e total, o indice do conteudo de clorofila e o indice de qualidade de Dickson. O crescimento de mudas de jurema-branca e favorecido com a diluicao de 25% de agua residuaria da piscicultura na agua de abastecimento. O uso de ate 25% da concentracao do efluente da piscicultura nao afeta de forma significativa o acumulo de biomassa seca em mudas de jurema-branca em relacao a testemunha. O reaproveitamento da agua da piscicultura diluida em proporcao de ate 25% e uma alternativa viavel para suprir a demanda hidrica na producao de mudas florestais. Palavras-