Agriculture Reference
In-Depth Information
Irrigation
suitability map
Irrigation
suitability map
Irrigated land
uses map
Irrigated land
uses map
Irrigated land with different
degree of irrigation
suitability
Irrigated land with different
degree of irrigation
suitability
Rcwr
, calculated on
the basis of SWAP
Rcwr
, calculated on
the basis of SWAP
Ncw
r, basis of water
tariffs definition
Ncw
r, basis of water
tariffs definition
Rcwr
IEff =
Ncwr
Rcwr
Rcwr
FAO agronomic
efficiency of
water use
Index
FAO agronomic
efficiency of
water use
Index
Comparison
Comparison
IEff =
Ncwr
IEff =
Ncwr
IEff application to the total irrigated surface =
Crop Water Requirements (M mc - mc/ha)
IEff application to the total irrigated surface =
Crop Water Requirements (M mc - mc/ha)
Table 8. Values of IEff for the Land Units of Italy - Southern Regions
Soil suitability class
for specified
irrigation techniques
N. Not
suitable
S1. Suitable
S2. Moderately suitable
S3. Marginally suitable
IEff values
1.0
1.25
1.67
2.60
2.6 New methodologies and quantitative methods
The SWAP Soil-Water-Atmosphere-Plant (SWAP ver. 3.0.3., 2003 - University of
Wageningen -NL) model will be also used to calculate, trough several simulation cycles,
the best performance irrigation index Ip for irrigation practice for every benchmark site.
The performance irrigation index Ip is defined by the minimum irrigation volume (Virr)
necessary to maintain the crop productivity without stress with the same Potential
Evapotrasipartion (ETp).
ETp
Ip
Virr
The SWAP model consists in the implementation of mathematical soil water flow
descriptions, solute transport and soil temperatures, with special emphasis on soil
heterogeneity.
The model will be run on about 60-70 selected benchmark sites, representative of all
the variability of the system soil/crop/irrigation technique/water irrigation volumes.
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