The Effect Of Irrigation Water Quality On Soil
Properties Under Center Pivot Irrigation
Systems In Central Saudi Arabia
Author(s)
H. M. Al-Ghobari
Abstract
A field experiments were conducted for three growing seasons (2007 to 2009) at
five different sites of soil types and salinity levels. Five different ground water
qualities were used to irrigate five fields each with area of 50 to 54 hectares
planted with wheat crop and the irrigation system used at each field was center
pivot sprinkler system. The irrigated fields were located at different locations of
Riyadh region in Saudi Arabia. The soil samples were taken at different depths
(10, 20, 40, 60 cm) from the soil surface at the beginning of season 2007 and at
the end of season 2009.
The quality effect of irrigation water on each soil salinity at each depth was
determined. The results showed that all irrigated fields have differed in salt
concentration as indicated by soil electrical conductivity (ECe) values of the
saturated paste extracts. The soil salinity in some fields decreased and increased
in other soils, and the distribution of salts through the soil profile is highly
correlated with the salinity of irrigation water and soil type. Saline water
increased the soil salt content throughout the profile to a greater extent than nonsaline
water. Thus, the salts accumulation in soil of field 4 and 5 was closely
related to the salt concentration of irrigation water, and there was a progressive
and significant increase in soil salinity values as the salinity of irrigation water
increases. Also, the obtained results showed that the decrease or increase in soil
salinity through the soil profiles for all fields occurred mainly at first season and
slight increase in the following two seasons, and not with the increase of the
number of seasons, and the soil salinity values remains closely the same and
does not influenced by the prolonged use of low or high salinity waters for a
number of years for all fields during the study.
Keywords
center pivot system, soil salinity, water quality, soil property, water applied, irrigation system, Saudi Arabia
Related Book
Other papers in this volume
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