Environmental Engineering Reference
In-Depth Information
600
500
400
Mean = 339
300
200
100
0
Rainfall Season
70
60
50
40
30
20
10
0
Ten-day Intervals Starting October 1
Wet year: 503 mm (1987-88)
Dry year: 223 mm (2007-08)
FIGURE 22.4
Rainfall characteristics at ICARDA research station, Tel Hadya, Aleppo,
Syria (1979-2009).
and increases in yield are remarkable even when rainfall is as high as 500 mm. The
response was found to be higher when rain distribution over the season is poor.
In Syria, average wheat yields under rainfed conditions are only 1.25 t/ha and this
is one of the highest in the region. With SI the average grain yield was up to 3 t/ha.
In 1996, over 40 percent of rainfed areas were under SI and over half of the 4 million
tons national production was attributed to this practice. Supplemental irrigation does
not only increase yield but also stabilizes farmers' production. The coefficient of
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