نگرشي بر سامانه هاي آبياري قطره اي در تامين آب مورد نياز مركبات در مناطق خشك و نيمه خشك (مطالعه موردي )

A glance to drip irrigation systems in providing citrus water requirements in arid and semi arid regions (A case study)

High income of citrus has made a great attraction to extend citrus gardens with drip systems without caring to water scarcity particularly in arid and semi arid regions. Although drip systems in the studied region because of water limitation and importance of citrus are very popular, evaluation shows that some gardens are over irrigated while some others suffer from insufficient irrigation. For more evaluation, real water requirement and water consumed by irrigation in a number of gardens and also the relation between age and water requirement of citrus in more than 50 gardens with the age of 1 to 30 years were studied. Results indicated the management and evaluation of drip systems, with increasing the technical knowledge of farmers are very essential. The systems without clogging problems with sufficient pressure are over-irrigated while the systems which suffer from clogging and their pressure is not sufficient are not irrigated sufficiently. For example, in some evaluated gardens the volume of irrigation was measured as 21097, 11252, 16802, 14721, 498, 5648 and 10552 cubic meter per hectare while real water requirement base on modified Hargreave-Samani equation was estimated as 16470, 8680, 14160, 11647, 5590, 12990 and 13450 cubic meter per hectare, respectively.