The treatments consisted of control, two levels of formula 2: NPSB (100% and 200%) rates, two levels of formula 4:NPSZnB (100% and 200%) rates and three levels of recommended NP (50%, 100% and 150% NP) rates and recommended NPK. Thus, this study was conducted with the objectives to evaluate the effect of chemical fertilizer types and rates on potato tuber yield, yield components and tuber quality and to determine economically optimum and agronomically efficient types and rate (s) for potato production at Assosa area, western Ethiopia. There is little information on the response of the crop to different fertilizer types and chemical fertilizers under the conditions in the Benishangul Gumuz region. According to EthioSIS (2013), Assosa area soils are deficient with N, P, S, Zn and B and fertilizer application practices in the region have been mainly based on blanket recommendations, since limited studies were carried out. (2011), there is lack of knowledge and information with regard to balanced macro- and micro-nutrient types and rates in fertilizer blends as a major input to enhance crop productivity. However, there is little information on the impact of different types of fertilizers on the growth and productivity of potato and their interaction on the availability of micro nutrients in Ethiopia. Therefore, NPK fertilizer application is recommended for high yield and quality tuber production in Assosa area, western Ethiopia. It was observed that higher marketable tuber yield (30.03 t ha-1) and total tuber yield (34.58 t ha-1) were obtained with the application of NPK (110 kg N + 90 kg P2O5 + 69 kg K2O ha-1) implying that K is an important limiting nutrient besides N and P in the study area. The treatments consisted of control, three rates of NP combinations (55 kg N and 45 kg P2O5, 110 kg N and 90 kg P2O5, 165 kg N and 135 kg P2O5 kg ha-1), one NPK combination (110 kg N, 90 kg P2O5 and 69 kg K2O ha-1), formula 2 (100 % NPSB + 91.9 N kg ha-1 and 200% NPSB + 128.8 N kg ha-1) and formula 4 (100 % NPSZnB + 93.1 N kg ha-1 and 200% NPSZnB + 131.2 N kg ha-1). Thus, the objective of the study was to evaluate the effects of chemical fertilizer types and rates on tuber yield and quality of potato at Assosa, Western Ethiopia. Potato tuber yield and quality is constrained by a number of biotic and abiotic factors, among which low soil fertility is the prime one.
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