ABSTRACT
Drip irrigation supplies water directly in the root zone of a plant. This method allows the effective wetted soil volume to be reduced thus reducing the evaporation and deep (water and nutrients) percolation losses. The prediction of wetted soil volume under an emitter is a must for water management, because an over water application results in loss of water and fertilizers beyond the root zone, particularly in sandy soils [11, 22]. Mickelakis et al. [25] have observed negligible, moderate and high deep percolation losses in a drip irrigated avocado orchard for three water levels application: 0.30.Epan, 0.60.Epan and 0.90.Epan. Levin et al. [24] have evaluated the deep percolation beyond 60 cm depth in a sandy soil at 26% of the amount of water supplied.
