The results unconcealed that increasing the speed of N from zero to fifty five metric weight unit N ha-1 considerably accumulated most of the measured parameters. However, increasing N on the far side this level didn't have an effect on most of the parameters. selection additionally considerably influenced several parameters.
The interaction effects of N and selection weren't vital on all parameters. absolutely and extremely vital associations were found for variety of the measured parameters. lastly, the results unconcealed that the optimum performances of all varieties occurred at the N rate of fifty five metric weight unit N ha-1. additionally, improved selection Bubu, followed by Zemen, was superior to the opposite varieties in terms of tuber productivity.
Research findings have indicated that potato can be one among the foremost necessary crops to be introduced within the space wherever the population experiences continual deficiency disease thanks to significant dependence on cereal crops and poor crop productivity only if acceptable scientific discipline practices square measure applied (Zelalem et al., 2009). Potato is considered a high-tension food-security crop due to its ability to produce a high yield of high-quality product per unit input with a shorter crop cycle (mostly < one hundred twenty days) than major cereal crops like maize (Hirpa et al., 2010). it's been expressed by John J. Burke (2017) that a minimum of six major potato roles may be appointed to the potato tuber. Improved potato cultivars to nitrogen fertilizer, These embody hunger-relieving crop, food (either recent, processed), animal food, propagule (from that to supply successive crop), feed stock in business for starch and alcohol, item of commerce, and a resource of multifariousness. He additionally elaborate that potatoes square measure fully grown and eaten up in additional countries than the other crop; they're grown all told the continents except Antarctica. within the international economy they're the fourth most vital crop in total production and therefore the fourth largest contributor to human caloric consumption, when the 3 cereals, rice, wheat and maize.
Mulatu et al. (2008) distinguished that potato is that the second most advantageous crop next to kat (Chata edulis) in supporting farmers’ welfare with 759% increase in financial gain over sorghum (Sorghum bicolour (L.) Moench) that is that the main staple cereal crop grownup in Hararghe.
Compared to the opposite areas of potato production, this space is characterised by export market homeward-bound production significantly to Djibouti and African country (Hirpa et al., 2010). Similarly, Mulatu et al. (2005) expressed that the event of potato culture in Hararghe, like alternative vegetables, is thanks to the presence of export and cross-border market outlet to Djibouti and Somalia; it's additionally thanks to the presence of a domestic market within the major urban settlements of Hararghe, together with Dire Dawa, Harar, Jigjiga, Asebe Teferi and a number of alternative other cities. Most farmers grow native potato varieties particularly, Batte, Jarso, Samune, Daddafa, Mashena dima, etc. throughout the year exploitation irrigation and rainfalls (Anonymous, 2011).
Nitrogen is that the mineral nutrient most typically deficient in agricultural soils. As a result, in developed countries, farmers apply comparatively high rates of N fertilizers.
Soil-plant system inefficiencies forestall complete utilization of the N, feat residual N within the soil, that could be a waste of natural resources and cause for environmental concern (Hopkins et al., 2008). Worldwide, crops don't directly utilize concerning half the applied N and therefore the overall N use potency has declined with increasing N chemical use (Dobermann, 2005). On the opposite hand, as compared to the developed countries, in developing countries like Ethiopia, Republic of Kenya and Republic of Uganda, the amounts of fertilizers applied to the potato crop square measure terribly low.