Agriculture Reference
In-Depth Information
Table 1. CASI 3 nomenclature (agricultural areas only)
CORINE code
Land use code
Description
211
211
Not irrigated arable land
2121
Irrigated industrial crops at spring - summer cycle
2122
Irrigated horticulture at summer - autumn - spring cycle
212
2123
Irrigated horticulture at spring - summer cycle
2124
Nurseries
2125
Greenhouses
213
213
Rice field
2211
Irrigated vineyards
221
2212
Not irrigated vineyards
2221
Irrigated fruit and berries plantation
222
2222
Not irrigated fruit and berries plantation
223
2231
Irrigated olives groves
2232
Not irrigated olives groves
231
Irrigated pastures
231
232
Not irrigated pastures
The methodology developed consists of the following steps:
1.
intersection between CASI 3 land use cartography and the irrigated areas layers;
2.
aggregation CASI 3 and short term ISTAT data per single Agriculture Region;
3.
calibration of ISTAT data with those of AGEA and land reclamation and irrigation
consortia;
4.
identification of the possible crop frequency classes per single CASI 3 class polygon
(i.e. a polygon formed by irrigated arable land of industrial cultures — class 2121 — of
30 hectares is made by: 50% corn, 20% sugar beet, 20% sunflower, 10% sorghum
= 100%);
5.
clipping of the CASI 3 polygon with relative frequency class on the irrigated area
boundaries.
Table 2 and Figure 3 show how, inside a Comprensorio, for each land use
polygon/class every single irrigated crop is defined (4th level) and the related area
calculated.
2.2.2 Crop water requirements
The CWR analysis and evaluation is based on two different values: nominal crop
water requirements (N CWR) and real crop water requirements (R CWR). The first one
refers to the volumes value used by the irrigation consortia to define the water cost (tariff
"#$￿%￿￿￿￿￿￿￿￿￿￿￿&￿'￿￿
consideration the soil and meteorological variability, but historical data from literature
and experimental parcels (coming from: Land Reclamation and Irrigation Consortium
archive — see Figure 4; specific studies at parcel or irrigation districts level from
Agriculture University and research Institute). These data have been collected, processed
and stored in the land use database. But available data do not cover all the irrigated areas.
In these cases, the evaluation of N CWR is based on the FAO methodology, applied on
the main crops per area (from land use map), and the assessment of the effective rainfall.
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