Irrigation scheduling strategies Sample Clauses

Irrigation scheduling strategies. The effect of different irrigation strategies has been also considered. More specifically, the application of a deficit irrigation (DI) strategy has been evaluated in order to reduce crop water consumption to counterbalance the expected increase of daily ETc due to climate change. DI is an effective management strategy under conditions of water scarcity for increasing water productivity for various crops without causing severe yield reduction, by limiting water applications to drought‐sensitive growth stages, and thus improving water use efficiency (Xxxxxxx et al., 2002). With the “full irrigation” strategy, a crop is kept at maximum potential ETc and no reduction in yield is expected. On the contrary, with a “deficit irrigation” strategy crop ETc is fully satisfied only during the selected drought‐sensitive stages, while otherwise a certain level of water stress is allowed. As a consequence, yield reduction is expected, and its level will depend on the crop Ky values for the given stage and the severity of ETc reduction. The most appropriate DI strategies have been selected also according to current scientific knowledge on water productivity WP (or WUE) and crop sensitivity to water stress (Xxxxxx, 2007; Xxxxxxxxx and Xxxxxx, 1979; Xxxxxxx et al., 2008; Xxxxxxx et al., 2007; Xxxxxxx et al., 2012; Vaux and Xxxxxx, 1983) To simulate the effect of different irrigation strategies on crop water requirements and yield response to water under different climate scenarios, a combination of 7 irrigation strategies has been then defined and used to run the model for all the selected crops. The following different combinations of model parameters for irrigation scheduling (MAD and Kia) have been selected (as a function of the depletion fraction p), together with the selection of some critical crop specific Ky, as summarized in the tables 11‐12 and figure 3. Tab. 11 – Irrigation strategies tested with the model to simulate different levels of crop water stress and yield response. Irrigation strategies Management allowable depletion (MAD) Irrigation application coefficient (Kia) Mild water stress Severe water stress Full irrigation p – 0.05 0.7 No water stress allowed Mild stress 1 p + 0.10 0.5 Allowed in less sensitive stages No Mild stress 2 p – 0.05 0.35 Allowed in all stages No Medium stress 2 p + 0.10 0.25 Allowed in very sensitive stages Allowed in less sensitive stages Severe stress 1 p + 0.15 0.5 Allowed in very sensitive stages Allowed in less sensitive stages...
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