Sunflower (Helianthus annuus L.) is an annual plant native to the Americas. Is a grain-producing species with a high oil content, which can be used as a source of biodiesel as well as fodder. The cassava is a liquid derived from the cassava flour production. This organic waste can be used in agriculture due to its high content of nutrients such as, K, N, P, Ca, Mg and S and also avoiding harm the environment. The objective of this study was to evaluate the productivity of sunflower using organic fertilization with cassava. The experiment was conducted under field conditions at Lagoa Seca, PB State, and were analyzed the total production (PS), dry mass of the inflorescence (FCA), dry mass of seeds and inflorescence (FSC) and total dry biomass (FT). The highest yield (934.52 kg ha-1) was obtained with no applied cassava. The dosage of 250 mL of cassava yielded maximum values for dry mass of the inflorescence (2,380 kg ha-1) and dry matter of the seeds and inflorescence (3,432 kg ha-1), promoting a increase of 32.03% and 132.55% respectively when compared to the control treatment. The higher value of total biomass was 28,017 kg ha-1 when applied 375 mL of manipueria. The cassava as a source of organic fertilizer favors the dry matter accumulation of sunflower without raising the grain yield.