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poster - International Conference of Agricultural Engineering

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3. Results<br />

The water balance model was developed based on daily water balance on the 5 x 5 km grid,<br />

and then aggregated into administrative (provincial) units.<br />

3.1. Change in water balance from 1971 to 2010<br />

Annual mean rainfall increased over the analyzed period, while annual mean crop<br />

evapotranspiration decreased, as shown in Figs. 2 and 3. As a result, irrigation requirements<br />

decreased. The average amount <strong>of</strong> irrigation required in the 2000s, 511.8 mm/yr, was<br />

reduced by about 7.5% from that <strong>of</strong> the previous decade (Fig. 4).<br />

a) 1971-1980 (b) 1981-1990 (c) 1991-2000 (d) 2001-2010<br />

Figure 2: Annual mean precipitation (PR) by decade from 1971 to 2010.<br />

(<br />

a) 1971-1980 (b) 1981-1990 (c) 1991-2000 (d) 2001-2010<br />

Figure 3: Annual mean actual crop evapotranspiration (AET) by decade from 1971 to 2010.<br />

(<br />

a) 1971-1980 (b) 1981-1990 (c) 1991-2000 (d) 2001-2010<br />

Figure 4: Annual mean irrigation requirement (IR) by decade from 1971 to 2010.<br />

(

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