The diurnal course of transpiration was measured in
two apricot trees growing in 70 L pots. Each pot was
placed on top of a weighing balance (capacity 150
kg and, resolution of 5 g, Ohaus, model 3150510).
The top surface of each pot was covered with plastic
to eliminate soil evaporation. The mass of each pot
was recorded every half an hour using a Campbell
data logger (Model CR10, Campbell Sci, Logan, Utah,
USA).