Ethiopia has a huge potential to increase the production and productivity of potato ( L) mainly in north-western regions where current potato yields are less than 10 t ha. Soil fertility and disease are the major yield-limiting factors of potato in this part of the country. Three-year's on-farm research was conducted to get the optimum economic levels of nitrogen (N) and phosphorus (P) nutrients for the major potato-growing areas of north-western Ethiopia.
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