Abstract
This study aims to evaluate the potential effects of the climatic variations on the reference evapotranspiration (ET0) and, consequently, on the crop water requirements in the Apulian Tavoliere, one of the largest irrigated districts of Southern Italy. To reach this purpose, both climatic parameters (air temperature and rainfall) and estimated water requirements of ‘processing’ tomato (among the most representative irrigated crops in the district since the mid-1970s and, therefore, chosen as a study-case) were analyzed in order to find out if a time trend exists or does not. The analysis covered the period from 1957 to 2008. The analysis showed that the rainfall amounts decreased (−3.4 mm per year in the analyzed period), while air temperature increased (0.18 °C and 0.25−°C per decade for minimum and maximum, respectively). As a consequence of the climatic variation during the considered period, a growth trend of the ET0 (1.4 mm per year) and water deficit (3.2 mm per year) took place. As a consequence, the water amounts for irrigating the same crop in the considered period were growing. This increased consumption is in agreement with the perception of the farmers of the district but never documented. Through the FAO AquaCrop model, the tomato irrigation water requirements have been simulated during the considered period. The trend analysis of the seasonal evapotranspiration values simulated in 52 years confirmed the increase in tomato water requirements (0.7 mm per year).
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Acknowledgments
This research was funded by CLIMESCO (‘Evolution of cropping systems as affected by climate change’) project, contract n. 285, 20/02/2006 (Ministry for Education, University and Research, Italy).
The Authors thank Dr. G. Rana (CRA-SCA) for the discussion about the available methods to estimate evapotranspiration.
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Palumbo, A.D., Vitale, D., Campi, P. et al. Time trend in reference evapotranspiration: analysis of a long series of agrometeorological measurements in Southern Italy. Irrig Drainage Syst 25, 395–411 (2011). https://doi.org/10.1007/s10795-012-9132-7
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DOI: https://doi.org/10.1007/s10795-012-9132-7