Two field experiments were carried out during 2015 / 2016 and 2016 / 2017 winter seasons in the Kabret El-Bahara area - Suez Governorate, Egypt to study the response of fodder beet (Beta vulgari, L.) Rotta cultivar to the combination between four levels organic manure fertilizer treatments at a rates of 10, 20, 30 and 40 m ³ / fed and application with four levels of potassium fertilizer treatments (24, 36, 48 and 60 kg k₂O / fed. Using the split- plot design which, the organic manure treatment were distributed in the main plots, whereas, the potassium fertilizer treatments in sub-plots in four replicates.The obtained results could be summarized as follows:The results showed that the higher levels of organic fertilizer gave the highest values and the best was the level of 40 m³ / fed Compared to the level of 10 m³ / fed In all the characteristics of the study at 100 and 150 days from sowing and also the characteristics of the yield and its components at harvest in both seasons.The increase of potassium fertilization added to soil at a rate of 60 kg k₂O / fed resulted in the highest values of growth traits at (100 and 150 days from planting), yield and its components at harvests compared to the levels of potassium fertilization at the levels of  24, 48, 60 kg k₂O / fed, respectively in both seasons.The results also showed that the addition of organic fertilization at a rate of 40 m³ / fed along with potassium fertilization at a rate of 60 kg K₂O / fed gave the highest values in the studded characteristics of growth, yield and its components in both roots and tops.  It was also found that the increase in the protein content of the top and roots as well as total carbohydrates was detected due to the treatment 40 m³ / fed organic fertilizer plus 60 kg K₂O / fed added to the ground, respectively, in both seasons.Likewise the results revealed that the content of the top of nitrogen and potassium was highest in the roots and reached to the using the 40 m³ / fed organic fertilizer along with 40 m³ / fed potassium fertilization of 60 kg K₂O/ fed.The results of the calculation of the economic yield of the crop showed that the cultivation of beet crop by using organic fertilization at a rate of 40 m³ / fed plus potassium fertilization at a rate of 60 kg / K₂O/ fed proved to be is the best experimental economic experiment for the farmers.