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ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

LIGHT QUANTUM INTEGRAL AND PLANT DENSITY AFFECTS BUD AND SHOOT GROWTH, FRESH BIOMASS PRODUCTION AND BLOOM QUALITY IN SINGLE-STEMMED ROSES

Author:   N. Bredmose
Keywords:   Bloom quality, bud growth, cut rose, fresh biomass production, growth synchronization, light quantum integral, plant density, single-stemmed roses
Abstract:
The cut rose, grown as a single-stemmed crop, resembles a potted plant and can be adapted to transportable bench systems. Potentially, this cultivation method could increase control of rose development, flexibility of production and produce, and automation of difficult or laborous cultural operations. Synchronous growth and flowering is considered important. The effects of increased quantum integral and plant density on shoot growth, fresh biomass production, and bloom quality were studied in single-stemmed rose plants grown under 20 h photoperiods at 23°C air temperature. Plants were grown in rockwool cubes on ebb and flood benches irrigated with a complete nutrient solution, and were supplied with CO2 at 1000 μl 1-1. Increased daily quantum integral from 17.8 to 21.0 mol m-2 d-1 increased fresh biomass efficiency, stem diameter, and specific fresh weight while number of nodes, number of five-leaflet-leaves, plastochron, stem length at anthesis, and flower diameter decreased. Increasing plant density from 100 to 178 plants m-2 increased stem length at visible flower bud, and reduced both fresh biomass efficiency and specific fresh weight. Light quantum integral is suggested to be used as a means to synchronize single-stemmed rose plant development.
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