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Os estercos sao subprodutos da pecuaria por vezes descartados, mesmo sendo potencialmente adubos orgânicos. A agua residuaria tambem e considerada outro subproduto de potencial para reuso na agricultura. Objetivou-se avaliar o teor de nitrogenio, fosforo e potassio em plantas de girassol ornamental (Helianthus annuus L ., cv. Sol Noturno) adubadas com esterco bovino e irrigadas com efluente domestico tratado. Os fatores estudados foram 2 tipos de agua de irrigacao (abastecimento e efluente domestico) e 4 doses de esterco bovino (5, 10, 15 e 20%, com base em peso). Aos 60 dias depois do plantio (DAP), as plantas de girassol foram colhidas e fez-se a preparacao das amostras de parte das plantas (raizes, caules, folhas e flor), as quais foram secadas em estufa com ventilacao forcada a 62 °C, durante 72 horas e em seguida, realizou-se a determinacao dos teores de nitrogenio (N), fosforo (P) e potassio (K) em uma amostra composta de diferentes partes. O teor de N foi influenciado positivamente pelas doses de 10, 15 e 20% de esterco bovino, sem diferenca entre elas e, embora nao significativamente, a agua residuaria proporcionou os maiores teores em todos os macronutrientes avaliados. Macronutrients content in ornamental sunflower under bovine Manure and Wastewater Abstract : The manures are byproducts of cattle, sometimes discarded, even though potentially organic fertilizers. Similarly, the wastewater should be considered another potential byproduct of reuse in agriculture. The objective of this work was to evaluate the content of nitrogen, phosphorus and potassium in ornamental sunflower plants ( Helianthus annuus L., cv. Sol Not urno) fertilized with cattle manure and irrigated with wastewater. The factors two types of water (supply and wastewater) and four levels of bovine manure (5, 10, 15 and 20%, based on weight of soil) were used. At 60 days after sowing (DAS), plants were harvested and divided into plant parts (roots, stems, leaves and flower), dried in an oven with forced ventilation, at 62 °C for 72 hours. The contents of nitrogen (N), phosphorus (P) and potassium (K) were determinated in a composite sample of different parts. It was concluded that the N content was positively influenced by the doses of 10, 15 and 20% of cattle manure, with no difference between them and, although not significantly, the wastewater was the one that brought the highest levels in all macronutrients analyzed.

Teor de macronutrientes em girassol ornamental sob doses de esterco e efluente doméstico