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Articles by Mulugeta Seyoum
Total Records ( 3 ) for Mulugeta Seyoum
  Mulugeta Seyoum , Sentayehu Alamerew and Kassahun Bantte
  Field experiments were conducted during the main rainy seasons of 2009 and 2010 at three rainfed upland locations of Southwest Ethiopia to evaluate and select high yielding NERICA genotypes. A total of fourteen rice genotypes consisting of 9 NERICA, 3 FOFIFA and 2 genotypes as check, laid down in a randomized complete block design with three replications were used as treatments. The study revealed highly significant (p<0.01) difference between all genotypes with respect to yield and yield component traits studied in the three locations, except for panicles per plant at Shebe. NERICA4 and NERICA3 gave the highest mean grain yield at Shebe (6008.9 and 5866.7 kg ha-1) and Gomma-2 (4262.2 and 3915.6 kg ha-1). At Eladale, the local check (X-Jigna) was with the highest yielder (1080 kg ha-1). Among NERICA genotypes tested, 77% of them recorded 5-6 tons of grain yields per hectare at Shebe. Performance of all genotypes increased sharply with decrease in altitude from Eladale to Shebe and vice versa. Mean grain yield advantage of 20-23% was achieved by NERICA4 and NERICA3 over check genotypes at Shebe. The two NERICA varieties were recommended for rice producing farmers with an altitude range of below 1500 m a. s. l. to maximize grain yields in Southwest Ethiopia.
  Mulugeta Seyoum and Heluf Gebre- Kidan
  At the Fogera plain, Ethiopia rice is mainly grown under wet conditions. Therefore, understanding the nature of flooded soils is essential for better management of applied and native nutrients. Accordingly, field and laboratory experiments were conducted to study the major inherent properties and effects of applied mineral N and P fertilizers on soil total N and available P. A factorial combinations of N (0, 30, 60, 90, 120 and 150 kg N ha-1) and P (0, 13.2, 26.4, 39.6 and 52.8 kg P ha-1) fertilizers were applied using a randomized complete block design with four replications. The soil was characterized as Pellic Vertisol. Surface soil analyses indicated that the experimental field was clayey in texture (71.25% clay) and slightly acidic (pH 5.61) in reaction. Total N (0.28%), organic carbon (3.0%), percent base saturation (79.39%), cation exchange capacity (52.90 meq/100 g soils) and Olsen’s available P (36.20 ppm) were high while available K was medium (265.23 ppm). In the soil profile study, clay content, pH, percent base saturation and cation exchange capacity increased with depth whereas total N, organic carbon, available K and P declined. The Olsen’s method extracted the highest amount of P and was associated positively and strongly with number of panicles m-2 (r = 0.460**) and the number of spikelets panicle-1 (r = 0.487**) over Bray II. Besides, total N slightly decreased while available P slightly increased in the soil after harvest. The study revealed that the Olsen’ method was superior over Bray II in predicting available P in flooded rice soil.
  Mulugeta Seyoum , Sentayehu Alamerew and Kassahun Bantte
  Field experiments were conducted using fourteen rice genotypes during the main rainy seasons of 2009 and 2010 at three rainfed upland locations of Southwest Ethiopia to estimate the genetic variability, heritability and correlation coefficients of grain yield and yield contributing traits in upland rice. The experiments were laid down in a randomized complete block design with three replications. Highly significant (p<0.01) variation was obtained for days to 50% flowering, days to 85% maturity, plant height, panicle length, spikelets per panicle and thousand grains weight. Significant difference (p<0.05) were noted for panicles per plant, grains per panicle, total spikelet fertility and grain yield. Days to 50% flowering, plant height, grains per panicle, spikelets per panicle, thousand grains weight and grain yield showed relatively high GCV and PCV estimates. High heritability was obtained for plant height (92.17%), followed by 50% flowering (90.16%), thousand grains weight (83.17%), days to 85% maturity (82.45%), panicle length (79.25%) and spikelet per panicle (60.25%) which indicates high heritable portion of variation. High to medium estimates of heritability and genetic advance were obtained for plant height, days to 50% flowering, panicles per plant, spikelets per panicle, grains per panicle and thousand grains weight, indicating the roles of additive gene action and a good scope of selection using their phenotypic performance. Grains per panicle had maximum positive direct effect and highly significant (r = 0.906**) genotypic correlation coefficient with grain yield. The present study revealed that for increasing rice yield in upland ecology, a genotype should possess more number of grains per panicles, tillers per plant and panicle per plant, high spikelet fertility and large panicle size.
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