The promotion of flower bud differentiation of the secondary flower cluster by the processing of heat rejection after the planting of 'Amaou' strawberry [Fragaria] cultivar in the early-season culture
2008
Kitajima, N.(Fukuoka-ken. Agricultural Research Center, Chikushino (Japan)) | Sato, K.
In the early-season culture of the strawberries planted on or around the 10th of September, there is a tendency for a break in yields between January and February. In an attempt to continuously harvest the yields, the effects of the processing of heat rejection on secondary flower cluster were examined. 1. The period of the processing of heat for 'Amaou' and 'Toyonoka' started 25 to 40 days before the middle of October and by using this treatment method, the secondary flowers differentiated. As for 'Amaou', as the secondary flower cluster differentiated, the number of leaves decreased. From the 15th to the 20th of October, the secondary flower clusters emerged from the primary flower clusters. At this stage, the number of leaves emerging between the primary and the secondary flower clusters decreased. Even though the number of flowers of the primary flower cluster and the annual yield decreased, since the yield from January to February increased, the overall yield was the same. 2. The promotion effect of the processing of heat rejection to flower bud differentiation of the secondary flower cluster was caused by the lowering of the temperature of the surface of the leaves and the inside-temperature of the crown of the strawberry plants, which were caused by the lowering of air and soil temperature around the strawberry plants. 3. The processing of heat rejection was effected when the basal dressing of nitrogen in special manure manufactured for use on 'Toyonoka' strawberries was in the range of 5 to 10kg per 10a.
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