Impact of climate change on soil water balance, maize production, and potential adaptation measures in the Rift Valley drylands of Ethiopia

Muluneh, Alemayehu

doi:10.1016/j.jaridenv.2020.104195

Cited by 38 publications

(16 citation statements)

References 57 publications

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“…However, light interception and CO 2 assimilation are impaired under a curled leaf and closed stomata (Lobell et al., 2015). These disruptions affect the photosynthetic machinery of the leaf and the functionality of important enzymes necessary for the conversion of light energy to assimilates, resulting in loss of dry matter accumulation (Fahad et al., 2017; Jung et al., 2017; Muluneh, 2020). These phenomena may account for the low DBY and HI observed in the TS treatment in this study.…”

Section: Discussionmentioning

confidence: 99%

“…In this study, reductions in plant height, leaf area, leaf chlorophyll content, stem diameter, DBY, and HI were observed as the water stress severity increased. Water stress affects the development of the aboveground and belowground architecture of maize (Muluneh, 2020) because water forms an integral part of the soil and plant activities. Availability of water in the soil aids nutrient accessibility by the plant root.…”

Section: Discussionmentioning

confidence: 99%

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Maize response to combined heat and water stresses under varying growth conditions

2021

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Identificationof agronomic practices that can ameliorate the negative effect of combined heat and water stress on maize plants is vital in food security strategy. The objective of this study was to evaluate the effect of heat and water stress on the growth of maize (Zea mays L.) under variable growth conditions. A repeated greenhouse factorial experiment laid out in a completely randomized design with four replications was performed. The factors were maize variety, water stress, soil amendment, and soil type. The results showed a depressive effect of water stress on the maize leaf area, chlorophyll content, stem diameter, dry biomass yield, and harvest index. These attributes decreased as the severity of the water stress increased with harvest index dipping by 30.3 and 92.9% in moderate water stress (MS) and terminal waterstress (TS) plants, respectively. Sandy clay loam soil gave higher maize growth and yield attributes than loamy sand soil. The varied growth conditions imposed by the different water stresses, soil types, and soil amendments elicited different responses from the three maize varieties. Mean stability analyses/ranking identified ZM1523 and WE5323 as the top-performing varieties under poultry manure amendment for both non-stress and MS conditions, whereas under TS their performance improved in combined poultry manure/mineral fertilizer and mineral fertilizer treatments. Similarly, WE3128 gave its best performance under mineral fertilizer amendment for non-stress, MS, and TS conditions. Therefore, under combined heat and water stress conditions, the interaction of maize variety, soil type, and soil amendment should be considered to guarantee a high maize yield.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Maize response to combined heat and water stresses under varying growth conditions

2021

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“…The dataset from the MarkSim tool (for the future period) is downscaled data [38]; hence, this tool employs the stochastic downscaling technique. The tool has been found effective for the tropics [39], and has been used in Ethiopia in previous studies assessing the impacts of climate change [17,[40][41][42][43][44]. In addition, this weather generator tool is based on IPCC AR5 data (CMIP5), considered an appropriate data format for the DSSAT crop model.…”

Section: Data Resourcesmentioning

confidence: 99%

Adaptation Potential of Current Wheat Cultivars and Planting Dates under the Changing Climate in Ethiopia

et al. 2021

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Global warming poses a severe threat to food security in developing countries. In Ethiopia, the primary driver of low wheat productivity is attributed to climate change. Due to the sparsity of observation data, climate-related impact analysis is poorly understood, and the adaptation strategies studied so far have also been insufficient. This study adopted the most popular DSSAT CERES-Wheat model and the ensemble mean of four GCMs to examine the quantitative effects of adjusted sowing dates and varieties on wheat yield. The two new cultivars (Dandaa and Kakaba), with reference to an old cultivar (Digelu), were considered for the mid-century (2036–2065) and late-century (2066–2095) under RCP 4.5 and RCP 8.5 climate scenarios. The results showed that the Dandaa cultivar demonstrates better adaptation potential at late sowing with a yield increase of about 140 kg/ha to 148 kg/ha for the mid- and late-century under RCP4.5. However, under RCP 8.5, Kakaba demonstrates higher adaptation potential with a yield gain for early sowing of up to 142 kg/ha and 170 kg/ha during the mid- and late-century, respectively. Late sowing of the Dandaa cultivar is recommended if GHG emissions are cut off at least to the average scenario, while the Kakaba cultivar is the best option when the emissions are high. The adaptation measures assessed in this study could help to enhance wheat production and adaptability of wheat to the future climate.

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“…How to utilize underground water as an alternative source to strengthen irrigation activities and improve productivity is another potential direction against food security threats. Water management is important because climate changes, which are likely to occur during future decades, may have significant negative effects on the main water balance elements and maize yield [61]. Moreover, research also showed that Ethiopian farmers disfavored strategies related to water management, which can seriously waste the water potential of the area [49].…”

Section: Managing Water Supply and Demand In Drylandmentioning

confidence: 99%

Dryland Food Security in Ethiopia: Current Status, Opportunities, and a Roadmap for the Future

et al. 2021

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Given the impact of COVID-19 and the desert locust plague, the Ethiopian food security issue has once again received widespread attention. Its food crisis requires comprehensive and systematic research to achieve the United Nations Sustainable Development Goal of zero hunger. This review discusses the current situation and the causes of food security in Ethiopia. We focus on the challenges in the food security assessment field. The article lists seven typical causes of food insecurity and three roots of food security in Ethiopia. Long-term food security assessment and a comprehensive understanding and manageability for food security causes are considered as the main existing research challenges. Climate-resilient management, water management, and long-term ecosystem network monitoring and data mining are suggested as potential roadmap for future research.

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Impact of climate change on soil water balance, maize production, and potential adaptation measures in the Rift Valley drylands of Ethiopia

Cited by 38 publications

References 57 publications

Maize response to combined heat and water stresses under varying growth conditions

Maize response to combined heat and water stresses under varying growth conditions

Adaptation Potential of Current Wheat Cultivars and Planting Dates under the Changing Climate in Ethiopia

Dryland Food Security in Ethiopia: Current Status, Opportunities, and a Roadmap for the Future

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