Experimental site and plant material
The experiment was conducted in a research greenhouse
near Murcia, Spain, over a 2-week period
between November 2 (Day 306) and November 14
(Day 318) 1997. Three-year-old apricot trees (Prunus
armeniaca cv. Búlida, about 2 m high and 1.5 m wide
at the base of the crown, total leaf-area of about 6.4
m2) were grown in 70 L plastic pots containing soil
mixture of 2 parts clay loam, 1 part peat and 1 part
vermiculite.