Person: Tesfaye, K.
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Tesfaye
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Tesfaye, K.
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- Vulnerability mapping and advisory for prioritization of investment in maize and sorghum growing areas of AGRA target countries: synthesis(CIMMYT, 2023) Tesfaye, K.; Belay Simane; Ademe, D.; Ejeta, A.T.; Gebremariam, T.; Takele, R.; Getaneh, F.; Ndour, A.; Mekuriaw, A.; Sida, T.S.; Amede, T.; Snapp, S.S.
Publication - Climate change risks to the maize value chain in Ethiopia: Findings, implications and adaptation options(CIMMYT, 2023) Ademe, D.; Blasch, G.; Woldegiorgis, M.; Ndour, A.; Mekuriaw, A.; Worku, M.; Tesfaye, K.
Publication - Climate change impact on wheat and maize growth in Ethiopia: a multi-model uncertainty analysis(Public Library of Science, 2022) Mequanint, F.; Gayler, S.; Weber, T.K.D.; Tesfaye, K.; Streck, T.
Publication - Global high-resolution gridded dataset of N2O emission and mitigation potential from maize and wheat fields(Elsevier, 2021) Tesfaye, K.; Takele, R.; Sapkota, T.; Khatri-Chhetri, A.; Solomon, D.; Stirling, C.; Albanito, F.
Publication - Potential benefits of drought and heat tolerance for adapting maize to climate change in tropical environments(Elsevier, 2018) Tesfaye, K.; Kruseman, G.; Cairns, J.E.; Zaman-Allah, M.; Dagne Wegary Gissa; Zaidi, P.; Boote, K.; Rahut, D.B.; Erenstein, O.Climate change and population growth pose great challenges to the food security of the millions of people who grow maize in the already fragile agricultural systems in tropical environments. There is an urgent need for maize varieties that are both drought and heat tolerant given the already prevailing drought and heat stress levels in many tropical environments, which are set to exacerbate with climate change. In this study, the crop growth simulation model for maize (CERES-Maize) was used to quantify the impact of climate change on maize and the potential benefits of incorporating drought and heat tolerance into the commonly grown (benchmark) maize varieties at six sites in Eastern and Southern Africa and one site in South Asia. Simulation results indicate that climate change will have a negative impact on maize yield at all the sites studied but the degree of the impact varies with location, level of warming and rainfall changes. Combined hotter and drier climate change scenarios (involving increases in warming with a reduction in rainfall) resulted in greater average simulated maize yield reduction (21, 33 and 50% under 1, 2 and 4 °C warming, respectively) than hotter only climate change scenarios (11, 21 and 41%, respectively). Incorporating drought, heat and combined drought & heat tolerance into benchmark varieties increased simulated maize yield under both the baseline and future climates. The average simulated benefit from combined drought & heat tolerance was at least twice that of heat or drought tolerance and it increased with the increase in warming levels. The magnitude of the simulated benefits from drought tolerance, heat tolerance and combined drought & heat tolerance and potential acceptability of the varieties by farmers varied across sites and climate scenarios indicating the need for proper targeting of varieties where they fit best and benefit most. It is concluded that incorporating drought and heat tolerance into maize germplasm has the potential to offset predicted yield losses and sustain maize productivity under climate change in vulnerable sites.
Publication - Climate change and maize production in Zimbabwe(CIMMYT, 2016) Cairns, J.E.; Magorokosho, C.; Olsen, M.; Sonder, K.; Stirling, C.; Zaman-Allah, M.; Prasanna, B.M.; Tesfaye, K.
Publication - Climate change impacts and potential benefits of heat-tolerant maize in South Asia(Springer, 2017) Tesfaye, K.; Zaidi, P.; Gbegbelegbe, S.D.; Böber, C.; Rahut, D.B.; Getaneh, F.; Seetharam, K.; Erenstein, O.; Stirling, C.Monitoring of genetic gain in crop genetic improvement programs is necessary to measure the efficiency of the program. Periodic measurement of genetic gain also allows the efficiency of new technologies incorporated into a program to be quantified. Genetic gain within the International Maize and Wheat Improvement Centre (CIMMYT) breeding program for eastern and southern Africa were estimated using time series of maize (Zea mays L.) hybrids. A total of 67 of the best-performing hybrids from regional trials from 2000 to 2010 were selected to form an era panel and evaluated in 32 trials in eight locations across six countries in eastern and southern Africa. Treatments included optimal management, managed and random drought stress, low-nitrogen (N) stress and maize streak virus (MSV) infestation. Genetic gain was estimated as the slope of the regression of grain yield on the year of hybrid release. Genetic gain under optimal conditions, managed drought, random drought, low N, and MSV were estimated to have increased by 109.4, 32.5, 22.7, 20.9 and 141.3 kg ha−1 yr−1, respectively. These results are comparable with genetic gain in maize yields in other regions of the world. New technologies to further increase the rate of genetic gain in maize breeding for eastern and southern Africa are also discussed.
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