Development of a new cropping type of strawberry [Fragaria ananassa] using water curtain under short-day and night-cooling conditions
2007
Ienaka, T.(Tochigi-ken. Agricultural Experiment Station, Utsunomiya (Japan)) | Inaba, Y.
The purpose of this study was to prevent the none-differentiation in the axillary flower bud of strawberry under the high-temperature and long-day conditions, leading to long-term intermission of harvest. The new cropping type developed allowed the first axillary flower bud to differentiate using water curtain under the short-day and night-cooling conditions, resulting in the harvest from early October without long-term intermission. The photoperiod of eight hours was the most effective in the production of fruit of three plots; the other two periods were 12 and 16 hours. The yields of eight-hour plot were at most 95% greater than a conventional early cropping type. For the new type, the short-day treatment of axillary bud had been carried out simultaneously with the flower organ formation of terminal flower truss, leading to a decrease in the number of flowers, and 70mg/pot of nitrogen had been normally applied. However, the nitrogen application of 210mg/pot enhanced the differentiation of flower bud. Additionally, the bloom fruition of terminal flower bud became slightly earlier with a slightly increase in the number of flower, resulting in the yield from terminal flower truss greater by 20% than before. Indeed, the yield from terminal flower bud was increased by bed refrigeration technique. However, the review of the technique is required because of the delay of the bloom and harvest.
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