The determination of the rosebushes productivity was performed by a sampling during the production period, which usually occurred 2 months after the beginning of the irrigation process. Straight stems measuring more than 30 cm and presenting a floral bud were considered as of commercial grade. The stems were classified in three different sizes of 30, 40, and 60 cm; because of commercial wrapping, the flower stems should have the same length to make the bouquets.
The length of the stems was measured from the cutting point to the end of the bud. The stem diameter was determined at its lower end using a vernier caliper. As for the rose buds, the length was determined from the base of the bud, while the diameter was measured in its median part. Twenty harvests were performed throughout the experiment.