Deficit irrigation as a sustainable option for improving water productivity in Sub-Saharan Africa: the case of Ethiopia. A critical review

Asmamaw, Desale Kidane; Janssens, Pieter; Dessie, Mekete; Tilahun, Seifu A.; Adgo, Enyew; Nyssen, Jan; Walraevens, Kristine; Cornelis, Wim

doi:10.1088/2515-7620/ac2a74

Cited by 18 publications

(12 citation statements)

References 54 publications

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“…Some parameters such as total nitrogen, field capacity and pH did have a CV of less than 10%. All our findings on soil characteristics were similar to those reported by earlier studies [7] except available P, which may have been highly affected by the variation in fertilizer application in different plots.…”

Section: Plos Watersupporting

confidence: 90%

“…Compared to the semi-arid areas in Afar Region of Ethiopia, 380 mm of irrigation water is less than half of what was used for irrigation at the growth stage and similar in magnitude to water use for deficit irrigation [21]. The lower irrigation water from the two technologies, WFD and Chameleon, indicated that smaller amount of water could be used and practically this can be done by deficit irrigation as reported by [22] to save water and irrigate more land.…”

Section: Amount Of Irrigation Watermentioning

confidence: 99%

“…Smallholder farmers in the Ethiopian highlands, however, have not received the benefits of irrigation technologies that could enable them to save water for additional crops, manage plant nutrients and reduce percolation. On the one hand, irrigation in Ethiopia is poorly developed in relation to the potential available; on the other hand, as most of the water is used up to irrigate a limited amount of land, there is little left to serve potentially irrigable land [7].…”

Section: Introductionmentioning

confidence: 99%

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Yield, water productivity and nutrient balances under different water management technologies of irrigated wheat in Ethiopia

Enyew

Belay

Schmitter³

et al. 2022

PLOS Water

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Development of irrigation technologies and agricultural water management systems holds significant potential to improve productivity and reduce vulnerability to climate change. Our study dealt with the behavior of irrigation water productivity, partial nutrient balance and grain yield of wheat under the application of different irrigation water management technologies in the Koga irrigation scheme in Ethiopia. For our analysis, we considered three nutrient fluxes entering and leaving farmers’ fields. Our experimental design had three irrigation blocks with three different irrigation water management practices (wetting front detector, Chameleon soil moisture sensor and farmers’ practice as control) on three farm plots replicated in each block. To calculate irrigation water productivity and grain yield of wheat, the amount of irrigation water applied and the agronomic attributes of wheat yield were recorded during the irrigation period. Further, three input and output variables were considered to determine the partial nutrient balances of nitrogen (N), phosphorus (P) and potassium (K). The results showed that the amount of irrigation water used was 33% and 22% less with a wetting front detector and Chameleon sensors, respectively, compared to the farmers’ practice. The wetting front detector (WFD) and Chameleon sensor (CHS) treatments gave a 20% and 15.8% grain yield increment, respectively, compared to the farmers’ practice plot. The partial nutrient balances of N and K were negative for the wetting front detector and chameleon sensor practices while it was positive for P in the control (farmers’ practice) treatment. We conclude that irrigation water management with appropriate technologies can improve yield, water productivity and the nutrient utilization. However, further research needs to be conducted on the suitability of irrigation management technologies to achieve full nutrient balance.

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Section: Plos Watersupporting

confidence: 90%

Section: Amount Of Irrigation Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Yield, water productivity and nutrient balances under different water management technologies of irrigated wheat in Ethiopia

Enyew

Belay

Schmitter³

et al. 2022

PLOS Water

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“…Irrigated agriculture can generate more agricultural yield and income compared with rain-fed agriculture [3][4][5]. In addition, irrigated agriculture comes with reliability, and a wider and more diversified choice of higher-value crops [6]. Irrigated agriculture utilizes 20% of cultivated lands throughout the world and produces 40% of total crop production [5], which is a significant contribution in terms of food security [7,8].…”

Section: Introductionmentioning

confidence: 99%

A Review on Evapotranspiration Estimation in Agricultural Water Management: Past, Present, and Future

Wanniarachchi

Sarukkalige

2022

Hydrology

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Evapotranspiration (ET) is a major component of the water cycle and agricultural water balance. Estimation of water consumption over agricultural areas is important for agricultural water resources planning, management, and regulation. It leads to the establishment of a sustainable water balance, mitigates the impacts of water scarcity, as well as prevents the overusing and wasting of precious water resources. As evapotranspiration is a major consumptive use of irrigation water and rainwater on agricultural lands, improvements of water use efficiency and sustainable water management in agriculture must be based on the accurate estimation of ET. Applications of precision and digital agricultural technologies, the integration of advanced techniques including remote sensing and satellite technology, and usage of machine learning algorithms will be an advantage to enhance the accuracy of the ET estimation in agricultural water management. This paper reviews and summarizes the technical development of the available methodologies and explores the advanced techniques in the estimation of ET in agricultural water management and highlights the potential improvements to enhance the accuracy of the ET estimation to achieve precise agricultural water management.

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“…Deficit and supplementary irrigation (DSI) is a term used to describe activities that help crops complete their production cycles when rain stops (Oweis, 1997;Oweis and Hachum, 2006;Geerts and Raes, 2009;Oweis and Hachum, 2012;Patane et al, 2015;Wang et al, 2015;Furgassa, 2017;Wale et al, 2019). However, several studies have shown that the ground water being used in DSI can contain levels of some dissolvable substances which over time could accumulate to levels that could affect physico-chemical and biological conditions of the soil (Abu-Awwad and Kharabsheh, 2000;Fox and Rockstro¨m, 2000;Costa, 2000;Fox and Rockstro m, 2003;Herrero and Perez Covetta, 2005;Truman and Rouland, 2005;Ali, et al, 2007;Bekele and Tilahun, 2007;Fereres and Soriano, 2007;Mon, et al, 2007;Asmamaw et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

On-Farm Adaptation to Climate Change: Assessment of Effects of Groundwater-Based Deficit and Supplementary Irrigation on Soil Quality Under Semi-Arid Ecosystems

Mashi¹,

Inkani²,

Yaro³

2022

Turkish JAF Sci.Tech.

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Agriculture is one of the sectors most affected by climate change, especially through the reduction in the number of rainy days in semi-arid areas, which require deficit supplementary irrigation (DSI) to minimise crop failures. Few studies have utilised soil quality indices (SQIs) to evaluate the quality changes of soils under DSI practices in semi-arid agricultural ecosystems. This paper examines the effects of DSI activities on soil quality in the Ingawa area of Nigeria’s semi-arid region. Plots subjected to different years of DSI (3, 5, 6, 8, 10, 11, 14 and 15 years) practices were chosen to serve as the controls. Soil samples were collected from each of the nine sites at depths ranging from 0 cm to 20 cm and 25 cm to 40 cm. The collected samples were analysed for physico-chemical properties. Soil quality change was estimated by computing percentage equivalence values that define the extent to which mean values of soils under DSI vary from those of the control. The results obtained show that the practices have caused significant negative changes in the levels of most of the properties considered, with significant deleterious effects on the selected physical and chemical indicators of soil quality to extents that might preclude sustainable agriculture on the soils. Potassium, organic carbon, organic matter, and some other essential nutrients needed for plant growth and soil stability have dropped a lot in irrigated farms compared to control farms, but salinization hasn't happened much. It was suggested that the right steps be taken to prevent the loss of important nutrients that crops need to grow well.

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Deficit irrigation as a sustainable option for improving water productivity in Sub-Saharan Africa: the case of Ethiopia. A critical review

Cited by 18 publications

References 54 publications

Yield, water productivity and nutrient balances under different water management technologies of irrigated wheat in Ethiopia

Yield, water productivity and nutrient balances under different water management technologies of irrigated wheat in Ethiopia

A Review on Evapotranspiration Estimation in Agricultural Water Management: Past, Present, and Future

On-Farm Adaptation to Climate Change: Assessment of Effects of Groundwater-Based Deficit and Supplementary Irrigation on Soil Quality Under Semi-Arid Ecosystems

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