Horticultural Research (Japan)
Online ISSN : 1880-3571
Print ISSN : 1347-2658
ISSN-L : 1347-2658
Crop Production & Cropping Type
Effects of the Raising Conditions and Nitrogen Concentration in the Field on Growth, Development and Fruit Yield in Strawberry Forcing Culture Using 72-Cell Plug Plants
Keisuke YamazakiHiroshi KumakuraHiroshi HamamotoYaoko Saito
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JOURNAL FREE ACCESS

2011 Volume 10 Issue 4 Pages 521-529

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Abstract

Effects of the shape and volume of plugs, duration of raising runner plants, and soil nitrogen concentration before planting on the initial growth, development of terminal and axillary inflorescences, and fruit yield in plug-grown ‘Akihime’, ‘Tochiotome’ and ‘Benihoppe’ strawberry plants were investigated to develop a technique for division of labor between raising runner plants and fruit production in strawberry forcing culture. Runner plants excised from the mother plant formed root clumps in 20 days when grown in the round-type 72-cell plug tray (37 mL/cell) for all 3 cultivars. These plug plants were the most suitable for transplantation compared to those grown in other plug trays (45 and 70 mL/cell). When ‘Benihoppe’ plants raised in plug trays for 20, 30 and 40 days were transplanted on the same day, the 20-day-old plug plants showed a better rooting and initial growth 20 days after transplanting compared to those of the older plug plants. The fruit yields of terminal inflorescence were also high in 20-day-old plug plants. Furthermore, in all 3 cultivars, the flower bud emergence of terminal inflorescence tended to be delayed if a certain amount of nitrate nitrogen was present in the soil before fertilization, resulting in decrease in fruit yield until March. The optimal nitrate nitrogen content (mg per 100 g dry soil) before fertilization was 2.5 to 6.3 in ‘Akihime’ and 4.4 to 8.8 in ‘Tochiotome’ and ‘Benihoppe’.

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© 2011 by Japanese Society for Horticultural Science
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