Abstract            Volume:10  Issue-12  Year-2022         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

The field experiments were conducted during the two successive winter seasons to study the response of potato plant (Solanum tuberosum L.) by the application of organic FYM rates on growth, yield and yield components and to identify their economically appropriate rates that maximize yield of Irish potato. The experiment was arranged in four level of farmyard manure (0, 3, 6 and 10 tons ha^-1) in one way Anova with blocking of RCBD with 3 replications. The result of the experiment indicated that main effect of FYM significantly (P<0.05) influenced most growth and yield and yield related parameters except, on days to emergency, flowering and unmarketable yield. Application of farmyard manure improved the productivity of potato plants and it was increased with increasing of the rate of farmyard manure levels up to 10 t ha^-1 in both seasons. The highest plant height (65.43 cm) was obtained at 10 t ha^-1 FYM, while the lowest plant height (37.00 cm) was recorded at control treatment. The maximum stem number per plant (8.5) was recorded at 10 t ha^-1 FYM, while the minimum (3) was recorded at control treatment. And also the highest (265.7 kt ha^-1) marketable tuber yield was observed with 10 t ha^-1 of FYM levels and the lowest (143.9 kt ha^-1) was recorded with the zero treatment. The maximum (308.7 kt ha^-1) fresh total tuber yield was recorded with 10 t ha^-1 FYM rates and the least (206.1 t ha^-1) total tuber yield was recorded at rate of zero application. Therefore treatments with farmyard manure gave the highest yield with high significant difference in comparison to the rest treatments. Considering the whole our economic analysis result proved that the maximum net benefit of 350962 Birr ha^-1 with an acceptable MRR of 4088.95 % was obtained from treatment that received 10 t ha^-1 of FYM fertilizer rates and could be recommended for production of potato in the study area.

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