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Articles by Kokobe W. Yohannes
Total Records ( 1 ) for Kokobe W. Yohannes
  Kokobe W. Yohannes , Derbew Belew and Adugna Debela
  A field experiment was conducted at Jimma University College of Agriculture and Veterinary Medicine research field from October 2011 to March 2012 under irrigation to assess the response of onion to farmyard manure and nitrogen fertilizer rates. The study consisted of four levels of FYM (0, 15, 30 and 45 ton FYM ha-1) and four levels of nitrogen (0, 50, 100 and 150 kg N ha-1). The experiment was arranged in 4x4 factorial arrangements in a randomized complete block design with three replications. Data on growth, yield and quality parameters were recorded and analysed using SAS Computer Software version 9.2. Results revealed that interaction of FYM and N fertilizer significantly (p<0.05) influenced Plant height, number of leaves, leaf length, maturity, average bulb weight, total yield, marketable yield; harvest index and bulb dry matter. However, leaf diameter, bulb length, bulb diameter and unmarketable yield were not affected by the combined application of FYM and N fertilizer. The findings highlighted that the performance of onion at Jimma area can be enhanced through application of FYM and N fertilizers. The highest bulb yield of onion (36.85 ton ha-1) was obtained when the plots received combined application of 100 kg ha-1of N and 45 ton ha-1 of FYM which significantly increased the total bulb yield by about 53% as compared to the unfertilized plot (17.45 ton ha-1). This however, was statistically similar with the combined application of 150 kg ha-1of N and 30 ton ha-1of FYM and also150 kg ha-1 of N and 45 ton ha-1 of FYM. In this study, maximum dry bulb yield of onion (33.30 ton ha-1) was obtained when the plots received combined application of 150 kg ha-1 of N and 30 ton ha-1 of FYM. Therefore, from statistical point of view and labour requirements to prepare and apply FYM, a combined application of FYM at 30 ton ha-1 and nitrogen fertilizer at 150 kg ha-1 rates can be considered optimum for obtaining high onion bulb yield at Jimma area.
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