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| 1 | Effects of nitrogen, phosphorus and vermicompost on groundnut yield in Babile District, eastern Ethiopia显示文摘Groundnut is a major cash crop for smallholder farmers in several districts of eastern Ethiopia with low yield. Little or no fertilizer was applied for the crop possibly because no generic or recommended fertilizer and technology were available. Therefore, field experiments were conducted for 2 consecutive cropping seasons in Babile District, to investigate effects of applying mineral N and P fertilizer and vermicompost (VC) on seed yield and oil content of groundnut using an improved variety ‘BaHa-Gudo’. Treatments consisted of nitrogen (0,23 and 46 kg N/ha), phosphorus (0,46 and 92 kg P2O5/ha) and VC (0,2.5 and 5 t VC/ha). Results revealed that yield attributes, seed yield and seed oil content were significantly (p < 0.01) affected by fertilizers. Seed yield after combined application of 46 kg N, 46 kg P2O5 and 2.5 t VC/ha increased by about 113% compared to seed yield without any fertilizers. Enhancement in seed oil content at the aforementioned rate was 7.0%. It could, thus, be concluded that applying the aforementioned fertilizers would enable farmers to increase seed yield and oil content of groundnut for enhancing their income and livelihoods in the study area. | Getachew Bekele Nigussie Dechassa Tamado Tana J.J.Sharma | 2019 | Oil Crop Science2019，4，2： | 2 |
| 2 | Effect of inorganic and organic fertilizers on productivity of groundnut(Arachis hypogaea L.)varieties in East Hararghe,Eastern Ethiopia显示文摘Groundnut(Arachis hypogaea L.)is a high economic value oil crop commonly grown in low-land semi-arid areas of Ethiopia.The crop production is constrained by low soil fertility;however,the nutrient management practice has been given low attention.This study was therefore conducted during the main cropping season of 2015/2016 at Babile and Fedis sites of East Hararghe,Ethiopia to evaluate the growth,nodulation,and yield response of groundnut varieties to the application of combined mineral nitrogen,phosphorus,and vermicompost fertilizers,and zinc.Treatments consisted of a factorial combination of three varieties(Ba-ha-Gudo,Ba-ha-Jidu,and Roba);three fertilizers combinations(0:0 kg N:POhawith no VC,46:46 kg N:POhawith no VC,and 46:46 kg N:POhawith 2.5 t VC ha);and three rates of Zn(0,5,and 10 kg Zn ha)in a randomized complete block design at both sites.The growth,nodulation,yield components,and yield data were subjected to analysis by SAS.The result revealed that plant height was significantly affected by variety and fertilizers combination,the number of branches plant-1affected by the interaction of variety and fertilizers combination while canopy spread and nodulation parameters were affected by the interaction of variety,fertilizers combination,and Zn rate.Pod plant-1and hundred seed weight,dry biomass,pod and seed yields,and seed oil content were significantly affected by the interaction of variety,fertilizers combination,and Zn rate.The highest dry biomass(7.26 t ha),pod(3.13 t ha),seed(2.16 t ha)yields and seed oil content(51.3%),net benefit($1704.2 ha)with a marginal rate of return of 242%were obtained from variety Ba-ha Gudo received the combined application of 46:46 kg N:POhaand 2.5 t VC hawith 5 kg Zn ha.Therefore,it can be concluded that the Ba-ha Gudo variety is preferably produced using the combined application of 46:46 kg N:POhaand 2.5 t VC hawith 5kg Zn hafor high productivity in the study sites and similar agro-ecologies. | Getachew Bekele Nigussie Dechassa Tamado Tana | 2022 | Oil Crop Science2022，7，3： | 1 |
| 3 | Aboveground carbon stock is related to land cover and woody species diversity in tropical ecosystems of Eastern Ethiopia显示文摘Background:Current theories on biodiversity-carbon sequestration relationship describe biodiversity as an important factor influencing carbon storage,either through complementarity effect or by mass ratio effect.So far,the expected form of biodiversity-carbon relationships in tropical ecosystems has not been known with certainty.Therefore,we explored the relationship between aboveground carbon stock and different biodiversity measurement indices(i.e.,species richness,species diversity,species evenness,and functional diversity)in different land cover types of Eastern Ethiopia.A total of 48 plots were established using stratified random sampling.Vegetation parameters such as diameter at breast height,diameter at stump height,tree height,and species type were recorded.Results:We found that the average aboveground carbon stock of the study area is 147.6±17.2 t ha^(−1)(mean,SE)across land cover types.Species richness,Shannon index,and functional diversity together explained 73.5%,61.4%,58.9%,and 52.0%of the variation in aboveground carbon storage in woodland,riparian forest,bushland,and farmland,respectively.Functional diversity was a significant predictor explaining the total aboveground carbon stocks(26.7%)across the land cover types.The effects of biodiversity on aboveground carbon storage were mediated by functional diversity and presence and dominance of species.This shows that both the selection effects and the niche complementarity are important for carbon storage.However,the impact of functional diversity effects(niche complementarity)was higher than that of functional dominance effects(selection effects).Conclusions:Implementation of protected area-based ecosystem conservation practices in the country seems feasible to mitigate climate change and Reducing Emissions from Deforestation and Forest Degradation(REDD+)programme should emphasize on biodiversity conservation. | Dejene W.Sintayehu Anteneh Belayneh Nigussie Dechassa | 2020 | Ecological Processes2020，9，1： | 1 |
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