Effects of shallow water table, salinity and frequency of irrigation water on the date palm water use

Askri, Brahim; Ahmed, Abdelkader T.; Abichou, Tarek; Bouhlila, Rachida

doi:10.1016/j.jhydrol.2014.03.030

Cited by 46 publications

(22 citation statements)

References 16 publications

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“…The effect of change in groundwater table on crop water consumption was analysed in many studies, and the contribution of groundwater to evapotranspiration decreases with the decline of WTD (Karimov et al, ; Gao, Huo, et al, ). On the other hand, lowering the groundwater table decreases the actual evaporation rate at the soil surface and consequently decreases the root‐zone salinity (Askri, Ahmed, Abichou, & Bouhlila, ; Chen & Hu, ). Therefore, lowering groundwater may also have an effect on the hydrological processes of riparian vegetation (Doody et al, ) or natural patches adjacent farmland.…”

Section: Resultsmentioning

confidence: 99%

Drip irrigation enhances shallow groundwater contribution to crop water consumption in an arid area

Wang

Huo

Guan

et al. 2018

Hydrological Processes

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Shallow groundwater plays a key role in agro‐hydrological processes of arid areas. Groundwater often supplies a necessary part of the water requirement of crops and surrounding native vegetation, such as groundwater‐dependent ecosystems. However, the impact of water‐saving irrigation on cropland water balance, such as the contribution of shallow groundwater to field evapotranspiration, requires further investigation. Increased understanding of quantitative evaluation of field‐scale water productivity under different irrigation methods aids policy and decision‐making. In this study, high‐resolution water table depth and soil water content in field maize were monitored under conditions of flood irrigation (FI) and drip irrigation (DI), respectively. Groundwater evapotranspiration (ETg) was estimated by the combination of the water table fluctuation method and an empirical groundwater–soil–atmosphere continuum model. The results indicate that daily ETg at different growth stages varies under the two irrigation methods. Between two consecutive irrigation events of the FI site, daily ETg rate increases from zero to greater than that of the DI site. Maize under DI steadily consumes more groundwater than FI, accounting for 16.4% and 14.5% of ETa, respectively. Overall, FI recharges groundwater, whereas DI extracts water from shallow groundwater. The yield under DI increases compared with that under FI, with less ETa (526 mm) compared with FI (578 mm), and irrigation water productivity improves from 3.51 kg m−3 (FI) to 4.58 kg m−3 (DI) through reducing deep drainage and soil evaporation by DI. These results highlight the critical role of irrigation method and groundwater on crop water consumption and productivity. This study provides important information to aid the development of agricultural irrigation schemes in arid areas with shallow groundwater.

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Section: Resultsmentioning

confidence: 99%

Drip irrigation enhances shallow groundwater contribution to crop water consumption in an arid area

Wang

Huo

Guan

et al. 2018

Hydrological Processes

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“…Date palms have a high water demand, which results in a lower unmet demand for land use scenario L2 than for land use scenario L1. However, date palms tolerate soil and water salinity [41], which are basic prerequisites for future crops in the Middle Drâa valley's agriculture [11].…”

Section: Water Demand and Unmet Demand In The Land Use Scenariosmentioning

confidence: 99%

Future of Water Supply and Demand in the Middle Drâa Valley, Morocco, under Climate and Land Use Change

Johannsen

Hengst

Goll

et al. 2016

Water

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Abstract:Regions of scarce fresh water resources, such as the Middle East and North Africa, are facing great challenges already today, and even more in the future, due to climatic and socioeconomic changes. The Middle Drâa valley in Morocco is one of many semi-arid to arid mountainous areas struggling with increasing water scarcity threatening self-sufficient husbandry. In order to maintain people's livelihoods water management needs to be adapted. The Water Evaluation And Planning System (WEAP) software has been widely used to examine complex water systems in the water resource planning sector all around the world and proved to be a helpful asset to show the various interactions of water supply and demand. This paper presents the application of WEAP on the Middle Draâ valley's water demand and supply, including several socioeconomic and land use scenarios under one basic climate change scenario. The climate scenario shows a significant decrease in available water resources up to 2029 while all socioeconomic scenarios show an increase in water demand. In years of droughts groundwater is used for irrigation, leading to increasingly depleted aquifers. The aquifers are recharged by percolation losses from irrigation and by river bed infiltration the latter of which is stronger in the northern oases than in the southern oases due to water withdrawal rules. A drastic reduction of irrigated agricultural area is the only solution to guarantee sustainable water use.

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“…Xie et al [4] reported that irrigation clearly increased reed water use, especially when irrigation quantities were higher than 3 cm·d . Askri et al [57] demonstrated that in order to increase date palm water use, high irrigation frequencies and shallow groundwater are needed to maintain high water content and low salinity in the root zone. Therefore, we would suggest it would be beneficial to have artificial irrigation to maintain the sustainable development of the arid riparian wetlands.…”

Section: Preseason Irrigation Strategymentioning

confidence: 99%

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

Jian-guo

et al. 2015

Water

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Abstract:In the Heihe River basin, China, increased salinity and water shortages present serious threats to the sustainability of arid wetlands. It is critical to understand the interactions between soil water and salts (from saline shallow groundwater and the river) and their effects on plant growth under the influence of shallow groundwater and irrigation. In this study, the Hydrus-1D model was used in an arid wetland of the Middle Heihe River to investigate the effects of the dynamics of soil water, soil salinization, and depth to water table (DWT) as well as groundwater salinity on Chinese tamarisk root water uptake. The modeled soil water and electrical conductivity of soil solution (ECsw) are for ECsw, during the model calibration and validation periods, respectively). The calibrated model was used in scenario analyses considering different DWTs, salinity levels and the introduction of preseason irrigation. The results showed that (I) Chinese tamarisk root distribution was greatly affected by soil water and salt distribution in the soil profile, with about 73.8% of the roots being distributed in the 20-60 cm layer; (II) root water uptake accounted for 91.0% of the potential maximal value when water stress was considered, and for 41.6% when both water and salt stress were considered; (III) root water uptake was very sensitive to fluctuations of the water table, and was greatly reduced when the DWT was either dropped or raised 60% of the 2012 reference depth; (IV) arid wetland vegetation exhibited a high level of groundwater dependence even though shallow groundwater resulted in increased soil salinization and (V) preseason irrigation could effectively increase root water uptake by leaching salts from the root zone. We concluded that a suitable water table and groundwater salinity coupled with proper irrigation are key factors to sustainable development of arid wetlands.

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Effects of shallow water table, salinity and frequency of irrigation water on the date palm water use

Cited by 46 publications

References 16 publications

Drip irrigation enhances shallow groundwater contribution to crop water consumption in an arid area

Drip irrigation enhances shallow groundwater contribution to crop water consumption in an arid area

Future of Water Supply and Demand in the Middle Drâa Valley, Morocco, under Climate and Land Use Change

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

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