Grain yield (kg/fed)

*Effect of different drip irrigation system types and different saline water on wheat grain yield. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip irrigation at soil depth 25 cm.*

#### **Figure 3.**

*Effect of different drip irrigation systems and different saline water on wheat straw yield. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip irrigation at soil depth 25 cm.*

greater with the tape at 0.2 m than at 0.1 or 0.025 m. El-Hagarey et al. [28] found that tape depths of 0.08 m (above the seed piece) and 0.46 m (below the seed piece) performed better than intermediate and greater depths. Tayel et al. [38] used 10 drip irrigation treatments to examine the effect of the timing of irrigation deficits on potato yield and water use efficiency in Spain. Irrigation deficits occurring during mid- and late-season tuber bulking were particularly damaging to yield. High yield was combined with high water use efficiency when irrigation deficits were restricted early in the season. Mansour et al. [49] investigated the performance

**69**

*Performance of Water Desalination and Modern Irrigation Systems for Improving Water…*

Grain water productivity (kg/m3)

100 70 40 100 70 40 100 70 40 SDI SSD-15 SSD-25

Drip irrigation system types and fresh water (%)

*Effect of different drip irrigation systems and different saline water on wheat grain yield water productivity. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip* 

Straw water productivity (kg/m3)

of 'Umatilla Russet' under drip irrigation in silt loam. The factors considered in the study were tape placement (one tape per row or one tape per two rows) and four soil water tension levels for automatically starting irrigation (1.5, 3.0, 4.5, and 6.0 bar). They concluded that drip tape placement had a significant effect on every variable except total marketable yield and bud-end fry color for which interactions of irrigation criteria with tape number were significant. Tape placement and irrigation criterion interacted to influence total yield, total marketable potatoes, and US No. 2 yield. Results indicated potato should be irrigated at 3.0 bar, given the silt loam soil and 2.5 mm water applied at each irrigation episode. The irrigation criterion

*Effect of different drip irrigation systems and different saline water on wheat straw yield water productivity. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip* 

Drip irrigation system types and fresh water (%)

100 70 40 100 70 40 100 70 40 SDI SSD-15 SSD-25

*DOI: http://dx.doi.org/10.5772/intechopen.87010*

0

**Figure 4.**

0

*irrigation at soil depth 25 cm.*

**Figure 5.**

0.5

1

wart S 1.5

2

2.5

3

3.5

) 3 m/ gk( yti vit cudor pr et a w

*irrigation at soil depth 25 cm.*

1

2

3

4

5

) 3 m/ gk( yti vit cudor pr et a wni ar G

6

*Performance of Water Desalination and Modern Irrigation Systems for Improving Water… DOI: http://dx.doi.org/10.5772/intechopen.87010*

#### 0 1 2 3 4 5 6 100 70 40 100 70 40 100 70 40 SDI SSD-15 SSD-25 ) 3 m/ gk( yti vit cudor pr et a wni ar G Drip irrigation system types and fresh water (%) Grain water productivity (kg/m3)

#### **Figure 4.**

*Irrigation - Water Productivity and Operation, Sustainability and Climate Change*

Grain yield (kg/fed)

greater with the tape at 0.2 m than at 0.1 or 0.025 m. El-Hagarey et al. [28] found that tape depths of 0.08 m (above the seed piece) and 0.46 m (below the seed piece) performed better than intermediate and greater depths. Tayel et al. [38] used 10 drip irrigation treatments to examine the effect of the timing of irrigation deficits on potato yield and water use efficiency in Spain. Irrigation deficits occurring during mid- and late-season tuber bulking were particularly damaging to yield. High yield was combined with high water use efficiency when irrigation deficits were restricted early in the season. Mansour et al. [49] investigated the performance

*Effect of different drip irrigation systems and different saline water on wheat straw yield. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip irrigation at soil* 

100 70 40 100 70 40 100 70 40 SDI SSD-15 SSD-25

Straw yield (kg/fed)

*Effect of different drip irrigation system types and different saline water on wheat grain yield. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip irrigation at* 

100 70 40 100 70 40 100 70 40 SDI SSD-15 SSD-25

Drip irrigation system types and fresh water (%)

Drip irrigation system types and fresh water (%)

**68**

**Figure 3.**

*depth 25 cm.*

Straw yield (kg/fed)

0

1000

**Figure 2.**

*soil depth 25 cm.*

2000

3000

Grain yield (kg/fed)

4000

5000

6000

*Effect of different drip irrigation systems and different saline water on wheat grain yield water productivity. SDI: surface drip irrigation; SSD-15: subsurface drip irrigation at soil depth 15 cm; SSD-25: subsurface drip irrigation at soil depth 25 cm.*
