Dynamic versus steady-state approaches to evaluate irrigation management of saline waters

Letey, J.; Feng, Guang-Da

doi:10.1016/j.agwat.2007.02.014

Cited by 73 publications

(41 citation statements)

References 20 publications

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“…Many steady and unsteady flow models have been used to study water flow in the soil (Bastiansen et al 2007). Letey and Feng (2007) have concluded that steady flow models tend to overestimate the negative effects of saline water. The problem of water flow in the soil gets more complex considering rainfall and the spatial variability (Bastiansen et al 2007;Isidoro & Grattan 2011).…”

Section: Methodsmentioning

confidence: 99%

Leaching effect of rainfall on soil under four-year saline water irrigation

Cucci¹,

Lacolla²,

Mastro³

et al. 2016

Soil & Water Res.

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Cucci G., Lacolla G., Mastro M. A., Caranfa G. (2016): Leaching effect of rainfall on soil under four-year saline water irrigation. Soil & Water Res., In the context of the overall competition for water resources it is important to understand the complex dynamics of crop water management including evapotranspiration, water quality, and leaching requirement, each of them depending on the site-specific conditions. The research started with grain maize and continued with sunflower, grain maize, and wheat, at the experimental field. On both grain maize and sunflower, 10 irrigation treatments were compared that resulted from the factorial combination of two types of water (fresh and brackish water) with five irrigation regimes; the scheduled treatments were applied by furrow irrigation. The amount of salts brought into the soil with the irrigation water during the three irrigation seasons of our trial increased shifting from the lowest to the highest irrigation regime and with the increase of salinity in the irrigation water. From the study of salt distribution in the soil it follows that at the end of the irrigation season the salt concentration increased by passing from the middle of the furrow, a zone more subject to leaching during irrigation, to the intermediate zone between the furrow and the ridge, and in the middle of the ridge between two contiguous furrows, an area of confluence of the wetting and salt accumulation fronts. The leaching water supplied during the irrigation season was poorly efficient in leaching the salts brought in through irrigation, whereas the rainfall water of the autumn-winter period after the irrigation season ensured a good control of soil salinity.

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Section: Methodsmentioning

confidence: 99%

Leaching effect of rainfall on soil under four-year saline water irrigation

Cucci¹,

Lacolla²,

Mastro³

et al. 2016

Soil & Water Res.

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show abstract

“…Evans and Sadler [2008] discuss crop water productivity issues and the potential for precision agriculture and deficit irrigation. Letey and Feng [2007] discusses salinity issues and leaching requirements. Bennett et al [2007] discuss possible improvements in water use efficiency from plant genetics.…”

Section: Context Of Irrigated Agriculturementioning

confidence: 99%

“…[55] Letey and Feng [2007] claim that equation 4 greatly over estimates the leaching requirement, because it assumes uniform salinity conditions in the soil profile, while the lower soil layers can actually be much more saline. Ayars and Schoneman [2006] have demonstrated that with good water management, salt can effectively be stored in the soil below the root zone, such that less salt is taken out in the drainage water than enters with the irrigation water.…”

Section: Water Conservation Effortsmentioning

confidence: 99%

Technical concepts related to conservation of irrigation and rainwater in agricultural systems

Clemmens

Allen

Burt

2008

Water Resources Research

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Forty percent of freshwater withdrawals in the United States are for irrigated agriculture, which contribute more than $50 billion to the economy. Increasing diversions of water for urban, environmental, and other uses will likely decrease water available to agriculture. Water conservation in agriculture is touted as a good method for minimizing the impact of reduced agricultural diversions on production. Because “wasted” water is often reused until it reaches the ocean, there are limitations to the true water savings that result from programs that aim to increase irrigation efficiency. True water savings can come from four areas: reduction of unnecessary evaporation and transpiration, more effective use of rainfall, reduction of deep percolation water that becomes severely degraded in quality, and reduction of runoff from fields that is not reusable downstream. Any other reduction in net water consumption must come from reductions in evapotranspiration from the crops grown, which requires either reduction in acreage or reduction in crop yield brought on by intentional plant water stress. Other benefits of field or district‐level water conservation may include increased in‐stream flows (due to lower diversions) and energy conservation due to less pumping or more hydroelectric production, but not result in true water savings, since unconsumed water returns as a usable water resource. Understanding the hydrologic settings is critical to determining true water savings from conservation practices. On‐farm water conservation practices that provide true water savings at one location may be ineffective at another. In large irrigation projects, water delivery limitations often present obstacles to on‐farm water conservation efforts.

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“…Many mathematical models have been used to study water flow and solute uptake through the soil (Bastiaanssen et al, 2007). Letey and Feng (2007) concluded that steadystate models tend to overestimate the adverse effects of irrigation with saline water, thus pointing to water quality standards for salinity higher than necessary (Corwin et al, 2007). There are also issues with spatial variability that limit the application of these models on a large-scale basis (Bastiaanssen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Irrigation with saline-sodic water: effects on two clay soils

Cucci

Lacolla

2013

Ital J Agronomy

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The results of a 4-year experiment aimed at evaluating the effect of irrigation with saline-sodic water on the soil are reported. The research was carried out at the Campus of the Agricultural Faculty of Bari University (Italy) on 2 clay soils (Bologna -T1 and Locorotondo -T2). The soils were cropped to borlotto bean (Phaseolus vulgaris L.), capsicum (Capsicum annuum L.), sunflower (Helianthus annuus L.), wheat (Triticum durum Desf) grown in succession; the crops were irrigated with 9 saline-sodic types of water and subjected to two different leaching fractions (10% and 20% of the watering volume). The 9 solutions were obtained dissolving in de-ionised water weighted amounts of sodium chloride (NaCl) and calcium chloride (CaCl2), deriving from the combination of 3 saline concentrations and 3 sodicity levels. The crops were irrigated whenever the water lost by evapotranspiration from the soil contained in the pots was equal to 30% of the soil maximum available water. The results showed that, though the soils were leached during the watering period, they showed a high salt accumulation. Consequently, the saturated soil extract electrical conductivity increased from initial values of 0.65 and 0.68 dS m -1 to 11.24 and 13.61 dS m -1 at the end of the experiment, for the soils T1 and T2, respectively. The saline concentration increase in irrigation water caused in both soils a progressive increase in exchangeable sodium, and a decrease in exchangeable calcium and non-significant variations in exchangeable potassium (K) and magnesium (Mg).

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Dynamic versus steady-state approaches to evaluate irrigation management of saline waters

Cited by 73 publications

References 20 publications

Leaching effect of rainfall on soil under four-year saline water irrigation

Leaching effect of rainfall on soil under four-year saline water irrigation

Technical concepts related to conservation of irrigation and rainwater in agricultural systems

Irrigation with saline-sodic water: effects on two clay soils

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