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Growth And Yield Of Irish Potato (Solanum Tuberosum L.) Response Under Different Levels Of N2-P2O5 Fertilizer And Farmyard Manure At Bore, Southern Oromia, Ethiopia

Volume 5 - Issue 9, September 2022 Edition
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Solomon Teshome, Arega Amide
Combined, Factorial, Farmyard Manure, Marginal Rate of Return, Rate
The field trial was conducted during 2018 and 2019 main cropping season at the Bore Agricultural Research Centre which is located in Guji Zones, with the objective of determining the effect of combined application of inorganic N2-P2O5 fertilizer and FYM rates on growth, yield and yield components of Irish potato and to identify their economically appropriate rates. The experiment was arranged in factorial combination of four level of farmyard manure (0, 3, 6 and 10 tons ha-1) with five level of Urea (0, 44, 88, 132 and 176 kg ha-1) and NPS (0, 49, 98, 147 and 197 kg ha-1) in combination in RCBD with 3 replications. Our data analysis showed that maximum number of stems per plant (10) was recorded in fertilizer rate of 132 kg N2 + 147 kg P2O5 and 6 t ha-1 FYM, meanwhile minimum number of stem number (4.66) was recorded for 0 kg N2-P2O5 and 3 t ha-1 FYM treatment. Application rates of 132 kg N2 + 147 kg P2O5 ha-1 with 6 t ha-1 FYM recorded maximum (14.77) tuber number while application of zero N2-P2O5 fertilizers + 6 t ha-1 FYM, recorded the least (8.22) tuber number. The combined application of 6 t FYM ha-1+ 132 kg N2 + 147 kg P2O5 ha-1 produced the highest marketable root yield (39.4 t ha-1) while the lowest yield (12.55 t ha-1) was from 4 t ha-1 FYM+0 kg P2O5 ha-1. Maximum total tuber yield (45.98 t ha-1) was obtained at 6 t FYM ha-1+ 132 kg N2 + 147 kg P2O5 ha-1 whereas the lowest (17.71 t ha-1, 18.29 t ha-1 and 18.65 t ha-1) was obtained at combined application of control treatment, 0 N2-P2O5 + 4 t FYM ha-1 and 0 N2-P2O5 + 6 t FYM ha-1 application rates, respectively. The MRR, which determines the acceptability of any treatment shows that, treatment receiving 132 kg N2 + 147 kg P2O5 ha-1 fertilizer rates in combination with 6 t ha-1 of FYM yielded good results of 26943.2% marginal revenue. Therefore the most attractive rates for producers with low cost of production and higher benefits in this case were 132 kg N2 + 147 kg P2O5 ha-1 with 6 t ha-1 farmyard manure combination and can be recommended for farmers in Bore and other areas similar agro ecologies.
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