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The use of manipueria (the organic wastewater from the cassava flour manufacturing process) is a promising management strategy in agriculture because it is a rich nutrient source for plants. Thus, this study aimed at evaluating the use of manipueria as a fertilizer for sunflower cultivation. The field experiment was carried out in a randomized complete block design with 6 treatments (doses of cassava: 0, 8.5, 17, 34, 68 and 136 m ha) and four replications, using the sunflower cultivar Helio 250. The experiment was collected at 90 days after sowing. We evaluated the shoot fresh and dry mass, achenes and oil yield, nitrogen, phosphorus and potassium content in leaves, stem, chapter and achenes. Data were initially submitted to analysis of variance at 5% significance level and then to regression analysis. The manipueira wastewater application significant increased fresh and dry mass accumulations in shoot, content of nutrients such as nitrogen, phosphorus and potassium in plant, as well grain and oil yields. The dose of 136 m ha resulted in the highest fresh and dry mass production in shoot and greater macronutrient accumulation supplying enough nitrogen, phosphorus and potassium to the plant, confirming the potential as an organic fertilizer. The 4562.52 and 1965.19 kg ha in achene and oil, respectively, obtained with the use of manipueira wastewater,yields are above the sunflower national and international average production.

The use of "manipueira" wastewater derived from cassava processing as organic fertilizer in sunflower cultivation