Crop Water Production Functions—A Review of Available Mathematical Method

Varzi, Manijeh Mahmoudzadeh

doi:10.5539/jas.v8n4p76

Cited by 9 publications

(7 citation statements)

References 31 publications

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“…Crop production function is defined as the relationship between water consumed (ET) and yield produced (Aiken et al 2013;Varzi 2016;Moberly et al 2017). Crop production function is defined as the relationship between water consumed (ET) and yield produced (Aiken et al 2013;Varzi 2016;Moberly et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, crop production functions are useful tools to estimate yield over a range of T or crop ET and yield relationships as affected by water allocations. Crop production function is defined as the relationship between water consumed (ET) and yield produced (Aiken et al 2013;Varzi 2016;Moberly et al 2017). Varzi (2016) reported the relationship to be useful for planning deficit irrigation.…”

Section: Introductionmentioning

confidence: 99%

“…Crop production function is defined as the relationship between water consumed (ET) and yield produced (Aiken et al 2013;Varzi 2016;Moberly et al 2017). Varzi (2016) reported the relationship to be useful for planning deficit irrigation. Many studies have shown linear relationship between wheat yield and ET up to some level of soil water deficit (Doorenbos et al 1979;Zhang and Oweis 1999;Aiken et al 2013;Moberly et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Yield and Water Productivity of Winter Wheat under Various Irrigation Capacities

Araya

Prasad

Gowda

et al. 2019

J American Water Resour Assoc

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The Agricultural Production Systems sIMulator model validated in a prior study for winter wheat was used to simulate yield, aboveground crop biomass (BM), transpiration (T), and evapotranspiration under four irrigation capacities (ICs) (0, 1.7, 2.5, and 5 mm/day) with two nitrogen (N) application rates (N1, 94 kg N/ha; N2, 160 kg N/ha) to (1) understand the performance of winter wheat under different ICs and (2) develop crop water production function under various ICs and N rates. Evaluation was based on yield, aboveground crop BM, transpiration productivity (TP), crop water productivity (WP), and irrigation WP (IWP). Simulation results showed winter wheat yield increased with increase in N application rate and IC. However, the rate of yield increase gradually reduced with additional irrigation beyond 2.5 mm/day. A 5 mm/day IC required a total of 190 mm irrigation and produced a 5%–16% yield advantage over 2.5 mm/day. This indicates it is possible to reduce groundwater use for wheat by 50% incurring only 5%–16% yield loss relative to 5 mm/day. The TP and IWP for grain were slightly higher under IC of 1.7 mm/day (15.2–16.1 kg/ha/mm and 0.98–1.6 kg/m3) when compared to 5 mm/day (14.7–15.5 kg/ha/mm and 0.6–1.06 kg/m3), respectively. Since TP and IWPs are relatively higher under lower ICs, winter wheat could be a suitable crop under lower ICs in the region. Relationship between yield–T and yield–ET was linear with a slope of 15–16 and 9.5–10 kg/ha/mm, respectively. Editor's note: This paper is part of the featured series on Optimizing Ogallala Aquifer Water Use to Sustain Food Systems. See the February 2019 issue for the introduction and background to the series.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Yield and Water Productivity of Winter Wheat under Various Irrigation Capacities

Araya

Prasad

Gowda

et al. 2019

J American Water Resour Assoc

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“…Under water limited condition, researchers found crop yield has linear relation with water use (Kirkham, 2005), which is commonly defined as crop water useyield production function (CWUPF) (Varzi, 2016). It is very useful for crop yield prediction and production risk assessment.…”

Section: Introductionmentioning

confidence: 99%

Predicting spring wheat yields based on water use-yield production function in a semi-arid climate

Zhao

Wang

Zhang

et al. 2019

Span. j. agric. res.

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Grain yield of spring wheat (Triticum aestivum L.) fluctuates greatly in Western Loess Plateau of China due to limited and highly variable precipitation. Farmers in this area need a simple tool to predict spring wheat grain yield and assess yield loss risk efficiently. The objectives of this study were to establish relations between water use and grain yield of spring wheat for predicting actual yield and attainable yield (water limited yield) under conventional management practice and mulching practices. Reference data during 1993-2013 and field experiment conducted from 1987 to 2011 were used to determine water use-yield production function and boundary function for spring wheat. Probability of achieving a given spring wheat grain yield threshold is determined based on available soil water content at sowing plus expected precipitation during growing season. Single linear equation was obtained with slope of 14.6 kg ha-1 mm-1 and x intercept at 126.3 mm for spring wheat water use-yield production function with different wheat varieties under varying climatic patterns. The slopes of the boundary function were 16.2 kg ha-1 mm-1 and 19.1 kg ha-1 mm-1 under conventional management practice and mulching practices, respectively. With increase of available soil water content at sowing, the probability of achieving at least 2000 and 4000 kg ha-1 of spring wheat for actual and attainable yield increased under different agricultural management practices.

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“…The implications of water stress on total production vary depending on the timing of the stress in the crop cycle. Water shortages during the initial and reproduction stages typically can lead to irreversible damages(Varzi 2016).…”

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confidence: 99%

Monitoring Water for Conservation: A Proof of Concept from Mozambique

Paúl¹,

Kondylis²,

Mueller³

et al. 2021

American J Agri Economics

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High-frequency data from three irrigation schemes in Mozambique reveal patterns consistent with water inefficiency. Farmers use the amount of water required at the most sensitive stage of production as a benchmark for all allocations in the crop cycle. We demonstrate that these rule-ofthumb approaches create scarcity at the plot level despite schemes having sufficient water to meet farmers' individual demands. We therefore explore the possibility of a feedback tool that visually communicates to farmers the potential to conserve by varying water applications at each stage of the crop cycle. To test the importance of tailoring the information to farmers' own settings, we randomize a set of farmers to also receive visualizations comparing water requirements with each farmer's water use in the same season of the previous year. The experiment fails to detect an additional effect of individualized comparative feedback relative to a general information treatment. Water measurement shows that the gains from correcting observed misallocations of water in terms of water savings and avoided scarcity is potentially large as a share of water used in the agricultural sector. These findings support additional testing of feedback tools to encourage water conservation but not the expensive investments that would be required to generate feedback based on individual metering for all targeted farmers.

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Crop Water Production Functions—A Review of Available Mathematical Method

Cited by 9 publications

References 31 publications

Yield and Water Productivity of Winter Wheat under Various Irrigation Capacities

Yield and Water Productivity of Winter Wheat under Various Irrigation Capacities

Predicting spring wheat yields based on water use-yield production function in a semi-arid climate

Monitoring Water for Conservation: A Proof of Concept from Mozambique

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