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This study was conducted to estimate whether natural K-feldspar fertilization alone and/or with silicate dissolving bacteria and banana compost as well as application with potassium could replace in full or partial with conventional potassium in sweet potato production with no converse effect on productivity. Thence, two field experiments were carried out during two successive summer seasons of 2013 and 2014 at the Hort. Res. Station of El-Bramoon, Dakahlia Governorate, to investigate the response of applied different sources from potassium fertilizers (potassium sulphate (PS) as conventional fertilizer and feldspar (FL) as natural potassium) at the recommended rate (96kg K2O/fed.) either single or in combination with others and/or the biofertilizer silicate dissolving bacteria (SDB); i.e. Bacillus circulans as well as banana compost on productivity and quality of sweet potato (Ipomoea batatas L.) cv. Beauregard. The obtained results indicate that the combined application of this treatment 25% kg K2O fed as + 25 %feldspar+25%banana compost+ SDB induced vegetative growth characters (vine Length, canopy dry weight and number of branches). Also, application of 25% kg K2O fed as + 25 %feldspar+25% banana compost+ SDB had the highest significant value among treatments in total yield,2marketable yield, tuber root characteristics (weight, length, diameter and dry matter %), chemical and organic composition (N, P, K, cured protein, total carbohydrates, total sugars and total carotenoids) of sweet potato plants. Therefore, it could be concluded that combined application of 25% kg K2O fed as + 25 %feldspar+25%banana compost+ SDB in sweet potato fields could be recommended to improve productivity and quality as well as utilization of the natural resources available in the Egyptian environment and minimizing the environmental impact of conventional potassium chemical fertilizers.

Effect of Some Natural Potassium Fertilizer Sources on Growth, Productivity and Quality of Sweet Potato (Ipomoea batatas L.)