Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia

Bossie, Mengistu; Tilahun, Ketema; Hordofa, Tilahun

doi:10.1007/s10795-009-9059-9

Cited by 24 publications

(28 citation statements)

References 3 publications

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“…The Kc values obtained in this study under the nomulch condition closely agree with those reported by FAO-56 (Allen et al, 1998) who gave Kc values of 0.7, 1.05 and 0.75 for initial, midseason and late season for the onion crop. The Kc values for the late season was however higher than that obtained by Bossie et al (2009) who reported values of 0.47, 0.99 and 0.46 for initial, midand late-seasons for onion (Red Bombay cultivar) in Awash Melkassa, Ethiopia. Lopez-Urrea et al (2009) also reported values of 0.65, 1.2 and 0.75 for initial, mid-and late-seasons for onion under sprinkler in Spain.…”

Section: Crop Coefficients Under Full Irrigation Conditionscontrasting

confidence: 66%

Crop coefficients and yield response factors for onion (Allium Cepa. L) under deficit irrigation and mulch practices in Samaru, Nigeria

Igbadun¹

2012

Afr. J. Agric. Res.

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This report presents a study of crop coefficient (Kc) and yield response factors (Ky) for onion crop cultivated under deficit irrigation and different mulch covers in Samaru, Northern Nigeria. The field experiments were conducted at the irrigation fields of the Institute for Agricultural Research (IAR) irrigation field in 2008/2009 and 2009/2010 irrigation seasons using surface irrigation method. The experiments consisted of 16 treatments in each season. They comprised of four levels of water application depths (25, 50, 75, and 100% of weekly reference evapotranspiration (WRET)) and four levels of mulching (no-mulch, using rice straws, black and transparent polyethylene materials). Water applied per irrigation and soil moisture contents before and after irrigation was monitored throughout the seasons, while onion bulbs were harvested at the end of season and weighed. Average daily crop water use (crop consumptive use) were estimated from the soil moisture content using the soil moisture depletion method, while daily reference evapotranspiration (ETo) were computed from weather data using the FAO-Penman Montieth method. Crop coefficient values (Kc) were computed as the ratio of crop water use to ETo. The water stress coefficients (Ks) were computed by relating crop coefficient of the fully irrigated treatments to the deficit irrigated treatments. The yield response factor (Ky) were obtained by relating relative yield decreases to relative crop water use deficits. The study showed that crop water use of the onion crop decreased with increase in irrigation deficit. Applying water at 50% WRET reduced peak consumptive use of the onion crop by about 20%, while applying water at 25% WRET reduced crop water use by about 40%. Kc values of fully irrigated treatments ranged from 0.39 to 1.15, while Kc values of the deficit irrigated treatments varied from 0.24 to 1.13. Mulch materials did not significantly influence crop coefficient, but deficit irrigation did. Kc decreased with increase in water deficit with resultant water stress coefficients (Ks) ranging from 0.59 to 0.96. The relative yield decreases of the onion crop were proportionally greater with increase in evapotranspiration deficit for both mulched and no-mulch conditions. However, the proportional decrease in yield under the nomulch condition was much higher than the mulched condition. Among the mulch materials, the proportional decrease in yield in the polyethylene materials were over 10% lower than the rice straw mulch. The Ky of the onion crop under no-mulch condition was 1.15, while Ky values for the mulched treatments were 1.13, 1.00 and 1.05 for rice straw-, white polyethylene-, and black polyethylene-mulch, respectively. The crop coefficients and yield response factors developed in this study are reliable as they had similar trends in two seasons, and could be used in irrigation design and scheduling for onion in the study area.

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Section: Crop Coefficients Under Full Irrigation Conditionscontrasting

confidence: 66%

Crop coefficients and yield response factors for onion (Allium Cepa. L) under deficit irrigation and mulch practices in Samaru, Nigeria

Igbadun¹

2012

Afr. J. Agric. Res.

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“…For the effects of irrigation methods on onion yield, the use of basin irrigation method produces a higher yield of onion crop. Similar results also reported that the basin irrigation method produces higher onion yields as compared to the other irrigation methods [25,45,53,54]. Moreover, the result is also in line with the farmers' irrigation methods preferences.…”

Section: Discussionsupporting

confidence: 83%

“…Gwandu and Idris [52] showed that irrigating every seven days on sandy loam soils can give 190.8 kg/ha of bulb yield. Bossie et al [22] indicated that the use of a fixed irrigation interval instead of the customary water delivery system could further encourage farmers.…”

Section: Discussionmentioning

confidence: 99%

“…Onion (Allium cepa L.) crop is one of the most dominantly consumed cash crops in Ethiopia [16,[22][23][24]. It is a key component in the Ethiopian daily foodstuff as it improves the taste and scent of the food [22]. In addition, onion is consumed more than any other vegetable crops in Ethiopia and 95% of its production is produced by smallholder farmers [25].…”

Section: Introductionmentioning

confidence: 99%

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Effects of irrigation scheduling and different irrigation methods on onion and water productivity in Tigray, northern Ethiopia

Haile

Gebremicael

Kifle

et al. 2019

Preprint

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Efficient irrigation water use can meet its objective if irrigated agriculture is managed properly in regions where water is limited. A two-year (2016)(2017) field experiments were conducted in the semiarid areas of Tigray in northern Ethiopia to evaluate irrigation scheduling with different irrigation methods. The experiments were carried out to identify their contribution for enhancing onion and water productivity in water-stressed irrigation schemes of Korir and Hatset sites. Six factorial treatments comprising of three levels of irrigation methods (furrow, basin and flood) and two levels of irrigation scheduling (fixed interval and farmer's practices) were evaluated with three replications. The agronomic and irrigation parameters were subjected to separate level-wise comparison followed by the factorial interaction effects. The results showed that the fixed irrigation interval, basin irrigation method and their 2 factorial combinations showed better performances and produced a higher yield and water productivity.On average, 263.85 q/ha and 281 q/ha of onion were obtained under the basin irrigation method and basin irrigation with fixed irrigation interval (T2) at both sites and seasons. For the T2, 6.27 and 6.06 kg/m 3 of water productivity (WP) and 4.39 and 4.24 kg/m 3 of irrigation water productivity (IWP) were obtained at Korir and Hatset sites, respectively showing higher results as compared to other treatment combinations.Moreover, the basin irrigation method produces higher marketable onion bulbs that are essential for onion producers to earn maximum profit from selling and enhance their livelihoods. Treatments comprising basin method and fixed interval showed better onion and water productivity in the water-limited irrigation schemes of Tigray. Hence, focusing on enhanced irrigation scheduling techniques and irrigation methods are important for effective agricultural water management. Farmers, irrigation experts, water resources managers and decision-makers are suggested to use these techniques to save the limited water resources and increase agricultural productivity.

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“…Bossie et al . (), using lysimeters in the Central Rift Valley (Melkassa Agricultural Research Centre, Ethiopia), determined that the water requirement of onions is 391 mm. They stressed the importance of calibrating crop coefficients K c for local conditions.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Analysis of Yield Gaps and Water Productivity on Smallholder Farms in Ethiopia, South Africa and Tunisia

Jovanovic

Musvoto

Clercq

et al. 2018

Irrigation and Drainage

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Agriculture in developing countries will have to transform and increase production by an estimated 70% in order to meet demands by 2050. Although well‐managed commercial farms offer little manoeuvring space for increasing agricultural water productivity, smallholder farms usually operate at low input costs and therefore provide ample opportunities to reduce the potential yield gap through agricultural intensification. The aim of this paper is to analyse and compare yields and water productivities obtained in field and modelling experiments in Ethiopia (maize, garlic, onion), South Africa (tomato) and Tunisia (tomato, potato, wheat). Innovative agricultural practices were introduced on smallholder farms: irrigation scheduling and NPS Zn fertilization in Ethiopia; high‐yielding cultivar, drip irrigation, mulching and organic amendments in South Africa; and crop water modelling in Tunisia. In general, crop yields increased up to eight times with innovative practices compared to current conventional farming practices. Crop water productivities were fairly stable within the same experiments, but increased with innovations, indicating that intensive farming can be more environmentally sustainable than conventional farming. Intensive farming systems in a resource‐rich environment (high radiation levels, relatively fertile, deep and well‐drained soils), combined with technology transfer and capacity building could be seen as viable strategies to secure food for smallholders and communities in African rural areas, as well as to improve water utilization in water‐scarce catchments. Copyright © 2018 John Wiley & Sons, Ltd.

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Crop coefficient and evaptranspiration of onion at Awash Melkassa, Central Rift Valley of Ethiopia

Cited by 24 publications

References 3 publications

Crop coefficients and yield response factors for onion (Allium Cepa. L) under deficit irrigation and mulch practices in Samaru, Nigeria

Crop coefficients and yield response factors for onion (Allium Cepa. L) under deficit irrigation and mulch practices in Samaru, Nigeria

Effects of irrigation scheduling and different irrigation methods on onion and water productivity in Tigray, northern Ethiopia

A Comparative Analysis of Yield Gaps and Water Productivity on Smallholder Farms in Ethiopia, South Africa and Tunisia

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