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Surface irrigation performance of date palms under water scarcity in arid irrigated lands

Haj-Amor, Zied; Ritzema, Henk; Hashemi, Hossein LU and Bouri, Salem (2018) In Arabian Journal of Geosciences 11(2).
Abstract

In this paper, a study on the performance of surface irrigation of date palms in a Tunisian arid area (Douz oasis) is presented. The study is conducted in 16 plots with various sizes and soil textures over a 4-year period (2012–2015). In the first step, an assessment of total water requirements of the date palms is carried out. Then, the surface irrigation performance is analyzed using three indicators, i.e., the relative water supply (RWS) indicator, the uniformity index of water distribution (DU), and the water application efficiency (Ea). Finally, the irrigation management problems are identified. The results indicate that in the arid Tunisian Saharan oases, the soil texture, plot size, and farmers’ practices... (More)

In this paper, a study on the performance of surface irrigation of date palms in a Tunisian arid area (Douz oasis) is presented. The study is conducted in 16 plots with various sizes and soil textures over a 4-year period (2012–2015). In the first step, an assessment of total water requirements of the date palms is carried out. Then, the surface irrigation performance is analyzed using three indicators, i.e., the relative water supply (RWS) indicator, the uniformity index of water distribution (DU), and the water application efficiency (Ea). Finally, the irrigation management problems are identified. The results indicate that in the arid Tunisian Saharan oases, the soil texture, plot size, and farmers’ practices (especially irrigation duration) have significant effects on surface irrigation performance. The average annual net irrigation requirements of date palms are about 2400 mm. The RWS increases from 1.8 in the smaller plots (0.5 ha) to 3.6 in the largest plots (2.5 ha), implying that the increase in the plot size requires an excessive water supply. DU decreases from 80.7 in the 0.5 ha plots to 65.4 in the 2.5 ha plots; however, no significant difference in the Ea is observed. The results show that the soil texture has no influence on the RWS and DU, but the Ea is significantly higher in the loamy-sand soils (46.7%) compared to the sandy soils (36.3%). Overall, RWS indicator is higher than 1 (RWS = 2.6) implying excessive irrigation supply to the system. Although DU is relatively uniform (> 60%), Ea is relatively low (< 50%) indicating that the current irrigation management is inefficient. These findings have a paramount importance for improving irrigation water management in the Tunisian Saharan oases.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arid area, Irrigation, Performance, Plot size, Soil texture, Water supply
in
Arabian Journal of Geosciences
volume
11
issue
2
publisher
Springer Verlag
external identifiers
  • scopus:85040336526
ISSN
1866-7511
DOI
10.1007/s12517-017-3374-5
language
English
LU publication?
yes
id
69b12ebd-7935-4eec-b43c-fc369c6dc69b
date added to LUP
2018-01-22 13:31:32
date last changed
2018-01-22 13:31:32
@article{69b12ebd-7935-4eec-b43c-fc369c6dc69b,
  abstract     = {<p>In this paper, a study on the performance of surface irrigation of date palms in a Tunisian arid area (Douz oasis) is presented. The study is conducted in 16 plots with various sizes and soil textures over a 4-year period (2012–2015). In the first step, an assessment of total water requirements of the date palms is carried out. Then, the surface irrigation performance is analyzed using three indicators, i.e., the relative water supply (RWS) indicator, the uniformity index of water distribution (D<sub>U</sub>), and the water application efficiency (E<sub>a</sub>). Finally, the irrigation management problems are identified. The results indicate that in the arid Tunisian Saharan oases, the soil texture, plot size, and farmers’ practices (especially irrigation duration) have significant effects on surface irrigation performance. The average annual net irrigation requirements of date palms are about 2400 mm. The RWS increases from 1.8 in the smaller plots (0.5 ha) to 3.6 in the largest plots (2.5 ha), implying that the increase in the plot size requires an excessive water supply. D<sub>U</sub> decreases from 80.7 in the 0.5 ha plots to 65.4 in the 2.5 ha plots; however, no significant difference in the E<sub>a</sub> is observed. The results show that the soil texture has no influence on the RWS and D<sub>U</sub>, but the E<sub>a</sub> is significantly higher in the loamy-sand soils (46.7%) compared to the sandy soils (36.3%). Overall, RWS indicator is higher than 1 (RWS = 2.6) implying excessive irrigation supply to the system. Although D<sub>U</sub> is relatively uniform (&gt; 60%), E<sub>a</sub> is relatively low (&lt; 50%) indicating that the current irrigation management is inefficient. These findings have a paramount importance for improving irrigation water management in the Tunisian Saharan oases.</p>},
  articleno    = {27},
  author       = {Haj-Amor, Zied and Ritzema, Henk and Hashemi, Hossein and Bouri, Salem},
  issn         = {1866-7511},
  keyword      = {Arid area,Irrigation,Performance,Plot size,Soil texture,Water supply},
  language     = {eng},
  month        = {01},
  number       = {2},
  publisher    = {Springer Verlag},
  series       = {Arabian Journal of Geosciences},
  title        = {Surface irrigation performance of date palms under water scarcity in arid irrigated lands},
  url          = {http://dx.doi.org/10.1007/s12517-017-3374-5},
  volume       = {11},
  year         = {2018},
}