Water–yield relations and optimal irrigation scheduling of wheat in the Mediterranean region

Zhang, Heping; Oweis, Theib

doi:10.1016/s0378-3774(98)00069-9

Cited by 348 publications

(213 citation statements)

References 22 publications

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“…Zhang and Oweis (1999) examined relationships between grain yield and evapotranspiration and reported slopes of 0.012 for durum wheat (y-intercept -0.11) and 0.016 for bread wheat (y-intercept -2.497) in the Mediterranean region. These relationships are similar to our findings for alfalfa and spring-seeded cereal crops in southern Alberta.…”

Section: Yield and Crop Evapotranspirationmentioning

confidence: 99%

Crop Yield and Water Requirement Relationships for Major Irrigated Crops in Southern Alberta

Bennett

Harms

2011

Canadian Water Resources Journal

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Water supplies available for irrigation in southern Alberta are limited. A study was conducted in southern Alberta to develop crop yield and evapotranspiration (ET c ) relationships for major irrigated crops based on current maximum potential crop yield data and improved methods for determination of crop evapotranspiration. Production functions for crop yield and the field water supply, which includes irrigation at 80% efficiency, effective precipitation, and stored soil moisture depletion, were subsequently determined. These empirical relationships may be used by water managers, economists, and producers to examine the economic implications of crop yield reductions from water stress due to limited water supplies, less than optimum (deficit) irrigation management, or variation in evaporative demand from year to year in different agro-climatic areas of southern Alberta. Potential yield estimates for different scenarios may be used with relevant economic information to determine optimum water use for irrigation.Résumé : L'approvisionnement en eau pour l'irrigation dans le sud de l'Alberta est limité. Une étude a été menée dans le sud de l'Alberta pour développer les relations entre le rendement des cultures et l'évapotranspiration (ET c ) pour les principales cultures irriguées fondées sur des données de rendement potentiel maximal actuel ainsi que sur les méthodes améliorées pour la détermination de l'évapotranspiration. Les fonctions de production pour le rendement des cultures et de l'approvisionnement en eau champ, qui comprend l'irrigation à 80% d'efficacité, les précipitations efficace, et la diminution de la réserve en eau du sol, ont été déterminées par la suite. Ces relations empiriques peuvent être utilisées par les gestionnaires de la ressource eau, les économistes et les producteurs pour examiner les conséquences économiques de la réduction des rendements due au stress hydrique associé aux réserves limitées en eau, à la gestion inadéquate (déficit) de l'irrigation ou aux variation du niveau d'évapotranspiration d'une année à l'autre sous les différentes zones agro-climatiques du sud de l'Alberta. Les estimations de rendements potentiels pour différents scénarios peuvent être utilisées en conjonction avec les informations économiques pertinentes pour optimiser la gestion de l'eau d'irrigation. 160Canadian Water Resources Journal/Revue canadienne des ressources hydriques

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Section: Yield and Crop Evapotranspirationmentioning

confidence: 99%

Crop Yield and Water Requirement Relationships for Major Irrigated Crops in Southern Alberta

Bennett

Harms

2011

Canadian Water Resources Journal

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“…Crop relative sensitivity, λ, has been defined by experimentation for sorghum (Jensen, 1968), wheat (Zhang & Oweis, 1999), corn (B. Zhang, Yuan, J. Zhang, & Li, 2008), cotton, peanut, and soybean (Woli, Jones, Ingram, & Hoogenboom, 2014).…”

Section: Y a Is The Actual Crop Yield;mentioning

confidence: 99%

Crop Water Production Functions—A Review of Available Mathematical Method

Varzi¹

2016

JAS

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Crop water production function is the relationship between obtained marketable yield and the total amount of water used by plant through evapotranspiration. Different mathematical expressions have been derived from field experiments to predict yield knowing water use. Such expressions provide a powerful tool in water allocation optimization. However these functions are commonly confused with the relationship between available water and crop yield. This paper reviews functions that describe crop water production, the context they can be used for, and their strength and weakness.Keywords: CWPF, yield response to water, evapotranspiration and crop yield, available water and yield, applied water and yield, deficit irrigation

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“…Zhang and Oweis [26] examine durum wheat production in Syria, where farmers rely partly on rainfall and partly on supplemental irrigation. Their estimated production is the following:…”

Section: Empirical Examplesmentioning

confidence: 99%

“…Crop water productivity would decline to 1.30 kg per m 3 , but farmers would be producing an additional 1.25 tons of wheat per ha. Zhang and Oweis [26] provide cost information that enables us to determine the profit-maximizing amount of supplemental irrigation. In a season with 250 mm of rainfall and a wheat price of $0.25 per kg, farmers would maximize profit by applying 454 mm or supplemental irrigation, generating a wheat yield of 6.58 tons per ha.…”

Section: Empirical Examplesmentioning

confidence: 99%

Do Estimates of Water Productivity Enhance Understanding of Farm-Level Water Management?

Wichelns

2014

Water

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Abstract:Estimates of water productivity are appearing with increasing frequency in the literature pertaining to agronomy, water management, and water policy. Some authors report such estimates as one of the outcome variables of experiment station studies, while others calculate water productivities when comparing regional crop production information. Many authors suggest or imply that higher values of water productivity are needed to ensure that future food production goals are achieved. Yet maximizing water productivity might not be consistent with farm-level goals or with societal objectives regarding water allocation and management. Farmers in both rainfed and irrigated settings must address a complex set of issues pertaining to risk, uncertainty, prices, and opportunity costs, when selecting activities and determining optimal strategies. It is not clear that farmers in either setting will or should choose to maximize water productivity. Upon examining water productivity, both conceptually and empirically, using published versions of crop production functions, I conclude that estimates of water productivity contain too little information to enhance understanding of farm-level water management.Keywords: economics; smallholders; irrigation; production functions; risk; uncertainty MotivationMany authors have called for improvements in water use efficiency or increases in water productivity in rainfed and irrigated settings, with the goal of increasing agricultural output to meet future food demands [1][2][3][4][5]. Some of the phrases that appear often in the agricultural and water management literature include the need to produce "more food with less water" and to generate "more crop per drop" [6][7][8][9]. The motivating rationale for such phrases is clear and legitimate. We must OPEN ACCESS

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Water–yield relations and optimal irrigation scheduling of wheat in the Mediterranean region

Cited by 348 publications

References 22 publications

Crop Yield and Water Requirement Relationships for Major Irrigated Crops in Southern Alberta

Crop Yield and Water Requirement Relationships for Major Irrigated Crops in Southern Alberta

Crop Water Production Functions—A Review of Available Mathematical Method

Do Estimates of Water Productivity Enhance Understanding of Farm-Level Water Management?

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