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Abstract
The availability and losses of NO3‐N, Ca and K in an olive‐orchard soil under two fertigation treatments (1 and 2 kg urea/tree year) have been studied. The amount of water applied to both treatments and to the treatment without fertilization (only water) corresponded to the equivalent of 0.4 times the evaporation observed in a class A pan. The availability of NO3‐N and Ca in the soil was very high. Analysis of leachates showed that K is slowly lost from the soil, although the Ark values suggest that the soil can easily recover these losses.