Effects of the number and the height of knuckles on the yield and quality of cut roses grown on high-rack training method
1998
Nimura, M. (Aichi-ken. Agricultural Research Center, Nagakute (Japan)) | Itoh, K.
In order to improve the quality and yield of cut roses, experiments were performed to determine the effects of height and number of knuckles per plant on the yield and quality of cut roses cv. 'Rote Rose' grown on rockwool culture. A knuckle on High-rack training method is formed at the curved base of assimilating branch which is bent down horizontally. The height of knuckles from ground was examined from 0 to 90 cm. The cut flower/yields for the total height and height above 80 cm were directly proportional to the knuckle position so that the higher the knuckle position, the higher the yields. Inversely, the higher the knuckle position, the narrower the diameter of flower peduncle. It was concluded that the knuckle position should be as high as possible suited to the level of a worker's waist, if the yield and quality of cut flowers in relation to work efficiency were to be considered. Knuckles per plant examined numbered from 1 to 6. This number was directly proportional to the total cut flower yield and inversely proportional to the diameter of flower peduncle. In case knuckles formed same number for each plant, two knuckles formed on two branches of a basal shoot brought about an increase in the total cut flower yield. However, it brought about a decrease in the diameter of the bottom of mother stem and flower peduncle, too. After the regeneration of knuckles, leaf area index had increased during 4 weeks and had become directly proportional to the number of knuckles per plant. The above results indicate that it is important that basal shoots grow out as many as possible, and that 3 or 4 knuckles may be adequate for the number of knuckles per plant when the plant density is 5 plants per square meter of total glasshouse. The number of knuckles per plant should be considered in relation to plant density
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