Commercial Floriculture

Yield

• The yield depends as several factors viz., cultivars, plant density/unit area, flowering duration, pruning method, nutrition, other cultural operations adopted from time to time.
• On an average the outdoor rose cultivation produces about 60-80 flowers/m2/year
• Plant density has much influence on total yield. Normally closure spacing yields more number of flowers than wider spacing.

International Quality Standards of Rose Cut Flowers for Export
General requirements
• Straight, strong stem capable of holding the flowers in upright position.
• Uniform stem length
• Tight bud and open slowly
• Size of the flower should be representative of the cultivars
• Flower Should be free from blemishes, bruising, injuries from diseases and pests
• Flower should have more number of petals arranged capacity

Table . ROSE – Rosa hybrida the Society of American Florist standards (SAF)

Vase life
• Senescence in cut roses is characterized by decrease in concentration of anthocyanin, protein and tannic acid and an increase in most amino acids, glutamine, Maleic acid and free ammonia in the petal tissue.
• The advances in senescence are due to increase in ethylene production and membrane permeability.
• Pre-cooled and pulsed flowers stored better in general. However some of the preservatives like 8HQC @ 300ppm, 8HQS @ 150pm, AgNO3 @20-30ppm, citric acid @ 200ppm have been found to be good for prolonging the vase life of cut roses.

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