The experiment was carried out in Wageningen (The
Netherlands, latitude 51.97 N, longitude 5.67 E) in July 2008,
in a heated experimental greenhouse. Rose plants ‘Akito’ were
grown on rockwool slabs (transplant 25 February 2008), in double
rows, at the plant density of 6.5 plants m−2. Water and fertilizers
were supplied via a drip-system, automatically controlled by a
fertigation computer.