期刊
AGRICULTURAL WATER MANAGEMENT
卷 49, 期 3, 页码 185-196出版社
ELSEVIER
DOI: 10.1016/S0378-3774(00)00148-7
关键词
EPIC model; sunflower; irrigation scheduling; yield; economic
A crop simulation model was used to optimize irrigation scheduling for sunflower grown in Southern Italy. The EPIC model, calibrated and validated in previous studies, was run for a 45-year simulation with climatic data; measured daily, using 66 scenarios involving a combination of irrigation times (at five fixed data), seasonal irrigation amounts (from 0 to 200 mm) and irrigation frequency. The results obtained from the simulation indicate: (i) the superiority of single or double irrigation in the central phase (bud flower opening, flowering) for seed and biomass yield; (ii) the optimal value of seasonal irrigation water to be about 250-300 mm for the highest water use efficiency value; (iii) the highest profitability for the farmer achieved with a single irrigation of 200 mm at bud flower phase and a reduction of net income with irrigation at sawing or at seed ripening phases. The EPIC model, due to its sub-models (growth, weather, soil, management, water, erosion, economic, etc.), can be considered a useful tool fo; comparing several management strategies, and requires a minimum investment of time and money. This approach could be used at the farm level or on a larger scale. (C) 2001 Elsevier Science B.V. All rights reserved.
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