Abstract :
The aim, of this research is to make a
comparison between two methods of irrigation: surface and
the pressurized irrigation, according to a parametric system
which was done in Chenaran plain in an area of 29113
hectares. The land properties (the Slope and the Drainage,)
and the physical and chemical properties of the soil (lime,
salinity, Alkalinity,) were considered as the base for
parametric assessment, and after the analysis with the use of
the geographic information system (GIS) the assessment was
made. The results showed that 58.34% of the land is
relatively suitable (S2) for surface irrigation, and 50% of the
land is relatively suitable (s2) for the purpose of pressurized
irrigation. 16.6% of the land is not suitable for surface
irrigation, neither for the pressurized one. In general the
result indicated that the suitability of the land for two
methods of irrigation is approximately the same. Since the
choice of a suitable method of irrigation could results in an
increase in production efficiency of the land, but it must be
noted that the main limiting factors which determines the
method of irrigation in each region are the texture of the soil,
salinity, Alkalinity, Drainage, calcium carbonate and the
slope and topography of the land. This research also showed
that GIS has an important role in assessment of the lands
suitability for different methods of irrigation.
