Evaluating irrigation scheduling and application efficiency: baseline to revitalize Meki-Ziway irrigation scheme, Ethiopia

Haile, Alemseged Tamiru; Alemayehu, Mussie; Rientjes, T.H.M.; Nakawuka, Prossie

doi:10.1007/s42452-020-03226-8

Cited by 7 publications

(1 citation statement)

References 23 publications

(29 reference statements)

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“…It also suggested encouraging the farmers toward use of drip irrigation and other agro-management techniques to increase production per single drop of water. 14 Nevertheless, while improving efficiency and productivity of irrigation water is crucial [29,72], private invest in such technologies requires well-defined water rights to incentivize the users [69]. Further, both the formal and informal institutional arrangements should be based on hydrological and economic conditions [9].…”

Section: Scenario Building For Sustainable Agricultural Intensificationmentioning

confidence: 99%

Irrigation-based agricultural intensification and future groundwater potentiality: experience of Indian states

et al. 2021

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While access to assured irrigation is a prerequisite for sustainable agricultural intensification, increasing use of groundwater for the same and decreasing areas under surface irrigation are expected to cause considerable hydro-ecological imbalance and hence serious concerns for sustainability. Importantly, the extent, nature, efficiency and impact of irrigation vary across regions depending on the geophysical and agro-climatic conditions, farming practices and socioeconomic setup. Nevertheless, it is suggested that appropriate crop diversification coupled with necessary policy and institutional supports can potentially reduce pressure on groundwater and make intensification in agriculture sustainable. Given this backdrop, this paper examines impact of irrigation and crop diversification on agricultural intensification and its implications for future groundwater dynamics in major Indian states. Using secondary data and applying panel data regression techniques for the period 1990–1991 to 2014–2015, the paper finds that both greater irrigation facilities and diversified crop basket increase cropping intensity. Similarly, use of more chemical fertilizers and higher yield also influence cropping intensity positively. However, rainfall variations and share of GSDP in agriculture have no significant impact. Based on the literature review and the above findings as well as using the insights from the informal interactions and random discussion carried out with the farmers and others stakeholders (e.g., researchers, community workers, extension service providers, NGO, etc.), the fuzzy cognitive models show that future policies and institutions should focus on improvement in agricultural systems and promoting surface irrigation. Besides, conservation and harvesting of rainwater, efficient functioning of the user groups, judicious use of chemical fertilizers and emphasis on cultivation of less water-intensive crops would also be crucial in this regard.

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Section: Scenario Building For Sustainable Agricultural Intensificationmentioning

confidence: 99%

Irrigation-based agricultural intensification and future groundwater potentiality: experience of Indian states

et al. 2021

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A remote sensing approach to estimate variable crop coefficient and evapotranspiration for improved water productivity in the Ethiopian highlands

Mebrie,

Assefa,

Yimam

et al. 2023

Appl Water Sci

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Proper and reasonable estimation of actual evapotranspiration is critical for the design, operation, and management of irrigation systems. However, the density of climatic stations is low in many parts of Ethiopia to estimate spatially reasonable reference evapotranspiration (ETo), and the lack of spatial variability of crop coefficient (Kc) is clear barrier to the proper management of irrigation water. Therefore, the main objective of this study was to estimate reasonable crop evapotranspiration (ETc) by deriving spatially and temporally varying crop coefficients using remote sensing products in 10 wheat plots at the Koga irrigation scheme. The moderate-resolution imaging spectroradiometer (MODIS) potential evapotranspiration was calibrated at two class-I climate stations (Bahir Dar and Dangila) based on Penman–Monteith estimates and Normalized Difference Vegetation Index (NDVI) was derived from Sentinel 2B, which was later used to derive Kc. The correlation between reference evapotranspiration from MODIS Penman Monteith was acceptable for both Dangila (R2 = 0.64) and Bahir Dar (R2 = 0.74) stations. The MODIS calibration constant for Koga irrigation schemes was 0.27 and 1.99 (regression slope and constant) on an 8-day basis. Similarly, a strong correlation (R2 = 0.95) was found between Sentinel-based NDVI and FAO crop coefficient, which indicated an alternative pathway for estimating crop coefficient. The value of Kc varies in space (across the 10 plots) from 0.16 to 0.42 at the initial stage and from 1.20 to 1.32 at the mid-stage. Similarly, the mean value of Kc varies in time from 0.29 at the initial stage to 1.26 at the mid-stage. On the other hand, evaluation of MODIS and WaPOR ETc found a significant difference (p < 0.05) with the calibrated MODIS-Sentinel 2B derived ETc. This indicated the need to calibrate both MODIS and WaPOR for the proper estimation of crop water needs. Underestimation of ET was observed from MODIS, and the reverse is true for WaPOR. Our findings showed that calibrating and integrating MODIS with Sentinel 2B would be a feasible approach to estimate Kc and hence ETc that varies in time and space. This would assist water managers in estimating crop water needs for better productivity in the region.

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Validation of farmers’ on-farm irrigation scheduling for optimal water utilization in Tigray Region, Ethiopia

Habtu

2024

Discov Agric

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Unwise use of irrigation water in water-scarce areas exacerbates water scarcity, diminishes crop yield, and leads to resource wastage. In the Tigray region of Ethiopia, where water is scarce and a determinant resource, no regional-level validation of on-farm irrigation scheduling had been conducted until now. The objectives of this study were to (i) validate farmers’ irrigation scheduling practices and (ii) optimize water consumption for increased irrigated area and number of farmers. Eight different irrigation schemes were purposively selected from the Tigray region. Primary data, acquired through field measurements, observations, and discussions, were supplemented with secondary data. Farmers' irrigation scheduling practices were predominantly of the "Fixed" type, characterized by constant irrigation intervals and amounts. Unfortunately, these practices were non-optimal, with 55% over-irrigation and 45% under-irrigation. Over-irrigation instances ranged from 1350 m3in a garlic plot within the Mesima scheme to a maximum of 1,327,067 m3in a maize plot within the Serenta scheme. The excess water could potentially be utilized to irrigate an additional area of 2 to 148 hectares, thereby benefiting 7 to 296 more farmers, respectively. Conversely, instances of under-irrigation in the Fre Lekatit scheme resulted in yield reductions of 10,445 kg for potatoes and 138,499 kg for maize. In the Tigray region, most of the schemes are semi-arid, emphasizing the imperative need for water conservation. Renovating regional-level irrigation scheduling by integrating performance assessment and enhancing water productivity at the field level, and establishing a remote-sensing-based 'Real-Time Irrigation Scheduling System' is deemed necessary to sustain dryland irrigated agriculture.

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Evaluating irrigation scheduling and application efficiency: baseline to revitalize Meki-Ziway irrigation scheme, Ethiopia

Cited by 7 publications

References 23 publications

Irrigation-based agricultural intensification and future groundwater potentiality: experience of Indian states

Irrigation-based agricultural intensification and future groundwater potentiality: experience of Indian states

A remote sensing approach to estimate variable crop coefficient and evapotranspiration for improved water productivity in the Ethiopian highlands

Validation of farmers’ on-farm irrigation scheduling for optimal water utilization in Tigray Region, Ethiopia

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