IMPACT OF CLIMATE UNCERTAINTIES ON IRRIGATION SCHEDULING UNDER MAIZE IN SOUTH BULGARIA
2010
Popova, Z., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria)
Climate change creates uncertainties for irrigation management. To cope with them, simulations were performed for present and scenario built weather conditions. In former studies, the irrigation scheduling simulation model ISAREG was calibrated in soils of high and moderate water holding capacity, respectively a vertisol and a chromic cambisol, and for water stress resistant/sensitive maize, respectively the hybrids Kn-2L-611 and H708. The study compares several irrigation scheduling alternatives developed from past studies aimed at improved irrigation practice with irrigation schedules presently advised in the region. Simulations for the pessimistic scenario show that the developed irrigation scheduling alternatives may easily accommodate the foreseen precipitation decrease when adequately selecting the irrigation dates, including delaying the conventional date for the last irrigation. Results are useful to build an information system for farmers using actual weather data and considering an increase in the seasonal irrigation demands for the pessimistic scenario. Coping with possible rainfall decreases requires adopting less sensitive crop varieties when deficit irrigation would be applied.
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