This study aimed to evaluate growth and production of ornamental sunflower (Helianthuns annuus L.), cv. Anão de Jardim, irrigated with dilutions of human urine in treated domestic effluent. The experiment was carried out in completely randomized design with five treatments and four replicates, in a greenhouse. Treatments consisted of four dilutions of human urine (0, 2, 4 and 6%) in treated domestic effluent and fertilization with 50% of the recommendation of mineral fertilizer. Plants irrigated with human urine dilutions (2, 4 and 6%) in treated domestic effluent and fertilized with 50% of the recommendation of nitrogen (N) and potassium (K) showed reductions of growth and production, while those irrigated with 0% human urine dilution in treated domestic effluent and fertilized with 50% of N and K recommendation exhibited similar performance to those irrigated with public-supply water and fertilized with 100% of the recommendation of mineral fertilizer. The obtained results allow to infer on the viability of replacing public-supply water by treated domestic effluent for irrigation, with reduction of 50% in N and K fertilization, without prejudice to the growth and production of ornamental sunflower plants, cv. Anão de Jardim.

RESUMO:Estudos têm mostrado que o uso de água residuária para produção agrícola pode melhorar o aproveitamento do potencial hídrico e nutricional das culturas de forma economicamente viável e ambientalmente sustentável. O objetivo deste trabalho foi avaliar o crescimento e a produção do girassol ornamental (Helianthuns annus L. cv. Anão de Jardim) irrigado com diferentes diluições de efluente doméstico tratado em água de abastecimento. O experimento foi conduzido em casa de vegetação, utilizando delineamento experimental inteiramente casualizado com cinco tratamentos, compostos por diluições de efluente doméstico tratado (EDT) (0 -testemunha, 25, 50, 75 e 100% de EDT) em água de abastecimento, com quatro repetições. Foram avaliados os indicadores biométricos e de produção da cultura. Observou-se efeito significativo das diluições de EDT apenas para as variáveis massa fresca e seca da parte aérea e área foliar, no entanto não foram observadas diferenças significativas entre as médias para nenhuma das variáveis avaliadas, o que permite inferir que a aplicação destas diluições de EDT em água de abastecimento não influencia nas variáveis de crescimento e produção avaliadas no girassol ornamental cv. Anão de Jardim. PALAVRAS-CHAVE:Helianthuns annus L., reuso, irrigação. USE OF DOMESTIC EFFLUENT TREATED FOR ORNAMENTAL SUNFLOWER PRODUCTION SUMMARY:Studies with the use of wastewater for agricultural production can improve the utilization of the water and nutritional potential of crops in an economically viable and environmentally sustainable way. The objective of this work was to evaluate the growth and production of ornamental sunflower (Helianthuns annus L. cv. Anão de Jardim) irrigated with 1 Doutora em Agronomia, Pós-Doutora (PNPD/CAPES), UFRB/PPGEA/NEAS, CEP 44380-000, Cruz das Almas, BA. Fone (75) K. S. Gonçalves et al.different dilutions of domestic effluent in water supply. The experiment was conducted in a greenhouse, using a completely randomized experimental design with five treatments, consisting of dilutions of treated domestic effluent (EDT) (0 -control, 25, 50, 75 and 100% EDT) and four replicates. The biometric and crop production indicators were evaluated. It was observed a significant effect of the EDT dilutions only for the variables fresh and dry mass of the aerial part and leaf area, however, are not observed, significant as means for the variables evaluated, which allows to infer that the application of dilutions of EDT in water supply not influenced by the growth and production variables evaluated in ornamental sunflower cv.Anão de Jardim. KEYWORDS:Helianthuns annus L., reuse, irrigation. INTRODUÇÃONa agricultura a água é essencial para o desenvolvimento e a produção das culturas, por isso que quando as chuvas se tornam escassas é de fundamental importância a complementação desta com o uso da irrigação. Em algumas regiões como o semiárido nordestino, onde as condições climatológicas estabelecem uma situação de escassez dos recursos hídricos devido aos baixos índices pluviométricos e as elevadas t...

The water and nutritional potential of wastewater has been frequently exploited as an alternative water source for the irrigation of crops, especially in regions affected by the scarcity of water resources. Thus, this study aimed to evaluate growth and production of ornamental sunflower (Helianthus annuus L.) cv. Anão de Jardim irrigated with different dilutions of treated domestic sewage in public-supply water. The experiment was conducted in completely randomized design with five treatments and four replicates, in a greenhouse, in the Experimental Area of the Agricultural Engineering Graduate Program of the Federal University of Recôncavo of Bahia, located in the municipality of Cruz das Almas - BA, Brazil. Treatments started seven days after transplanting of the seedlings and consisted of five dilutions of treated domestic sewage (TDS) in public-supply water (PSW) (100% PSW – control; 25% TDS + 75% PSW; 50% TDS + 50% PSW; 75% TDS + 25% PSW and 100% TDS). In the control treatment, plants were fertilized with 100% of the mineral fertilization recommendation, whereas plants in treatments with effluent received 50% of the nitrogen (N) and potassium (K) recommendation. Biometric (plant height, stem diameter, number of leaves, shoot fresh and dry matter and leaf area) and production (capitulum internal and external diameter, capitulum fresh and dry matter, beginning of flowering and full capitulum opening) indicators evaluated at harvest demonstrated that ornamental sunflower plants irrigated with 100% TDS showed similar performance to those irrigated with PSW, which makes it possible to infer on the possibility of replacing PSW by TDS in irrigation, along with the 50% reduction in the recommendation of N and K fertilization, with no damage to the growth and production of ornamental sunflower, cv. Anão de Jardim, thus leading to the saving of good-quality water and fertilizers.