Effect of salinity x calcium interaction on cation balance in melon plantsgrown under two regimes of orthophosphate

Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse to investigate the interaction of phosphorus (P) and calcium (Ca) under salin e conditions on vegetative biomass and cation balance. Three levels of Ca ( 0.4, 2, and 8 mM) were combined factorially with two levels of phosphate (0 .1 and 1 mM) under two regimes of NaCl salinity (10 and 80 mM). An increase of phosphate and salinity level decreased shoot and root growth. A strong antagonism between Ca and magnesium (Mg) was observed regardless of the sal inity level. Calcium effect on growth depended on the salinity level. At lo w salinity, an increase of Ca reduced sodium (Na) concentration in all plan t fractions. At high salinity, this effect was only significant in young an d medium leaves. At low salinity and low Ca the reduction of growth could b e due to Na toxicity and an unbalanced Ca/Mg ratio. In addition to that, at high salinity, the restoration of growth by increasing Ca concentration in the root medium could be due to an effect on water relation and by increas ing potassium K/Na selectivity.