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Katsumi Ohta

Kyoto University

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Shokubutsu Kankyo Kogaku | 1999

Differences in the Occurrence of Blossom-end Rot in Cherry and Large Fruit Tomatoes

Katsumi Ohta; Eijirou Takeda; Daisuke Yoshioka; Toshiki Asao; Takashi Hosoki

ミニトマトと大型トマトを供試して, 高温期と低温期において水耕培養液濃度を変えて栽培することによって, 尻腐れ果発生の差異を比較するとともに, 尻腐れ果発生初期の小果柄の離層部周辺の維管束の様子を観察した.1.ミニトマトでは低温期には尻腐れ果が全く発生しなかったが, 高温期には16～18%の発生が見られた.大型トマトでは低温期, 高温期いずれも高濃度培養液で栽培すると多くの尻腐れ果が発生した.2.ミニトマトの果実縦径当たりの果実生長量は栽培時の気温や培養液濃度によって変化しなかったが, 大型トマトのそれは高温期において高濃度より低濃度の培養液で栽培するとやや大きかった.3.尻腐れ果発生初期の小果柄の離層部周辺の維管束を正常果のそれと比較した.ミニトマトでは両者に大きな差異はみられなかったが, 大型トマトでは維管束数が減少し, かつ導管の径が小さくなっていた.

Journal of The Japanese Society for Horticultural Science | 2004

Effects of Chitosan Soil Mixture Treatment in the Seedling Stage on the Growth and Flowering of Several Ornamental Plants

Katsumi Ohta; Shinya Morishita; Kohei Suda; Nobuo Kobayashi; Takashi Hosoki

Journal of The Japanese Society for Horticultural Science | 1998

Decrease of Yield of Cucumber by Non-renewal of the Nutrient Hydroponic Solution and its Reversal by Supplementation of Activated Charcoal

Toshiki Asao; Motomasa Umeyama; Katsumi Ohta; Takashi Hosoki; Norihiro Ito; Hisafumi Ueda

Journal of The Japanese Society for Horticultural Science | 1999

Influences of Phenolics Isolated from the Nutrient Solution Nourishing Growing Cucumber (Cucumis sativus L.) Plants on Fruit Yield

Toshiki Asao; Md. H. R. Pramanik; Kouhei Tomita; Yumiko Ohba; Katsumi Ohta; Takashi Hosoki; Yoshihisa Matsui

Journal of The Japanese Society for Horticultural Science | 1999

Effect of Rootstocks on the Extension of Harvest Period of Cucumber (Cucumis sativus L.) Grown in Non-renewal Hydroponics

Toshiki Asao; Noriko Shimizu; Katsumi Ohta; Takashi Hosoki

Journal of The Japanese Society for Horticultural Science | 1999

Effects of Activated Charcoal and Dissolved Oxygen Levels in the Hydroponic Solution on the Growth and Yield of Cucumber Plants

Toshiki Asao; Yumiko Ohba; Kouhei Tomita; Katsumi Ohta; Takashi Hosoki

Journal of The Japanese Society for Horticultural Science | 2000

Effects of chitosan with or without nitrogen treatments on seedling growth in Eustoma grandiflorum (Raf.) Shinn. cv. Kairyou Wakamurasaki.

Katsumi Ohta; Hiroyo Atarashi; Yuko Shimatani; Shingo Matsumoto; Toshiki Asao; Takashi Hosoki

Journal of The Japanese Society for Horticultural Science | 1998

Possibility of Controlling Fruit-Cracking in Cherry Tomatoes by Light Treatment at Night

Katsumi Ohta; Kenji Tsurunaga; Takashi Hosoki

Journal of The Japanese Society for Horticultural Science | 1985

Relationship between endogenous hormone and nutrient levels in shoot apices of tomato and occurrence of fruit malformation, and its control by auxin spray and nutritional restrictions

Takashi Hosoki; Katsumi Ohta; Tadashi Asahira; Kiyoshi Ohta

Journal of The Japanese Society for Horticultural Science | 1990

Cultivar Differences in Fruit Malformation in Tomato and its Relationship with Nutrient and Hormone Levels in Shoot Apices

Takashi Hosoki; Katsumi Ohta; Tadashi Asahira

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Takashi Hosoki

Kyoto University

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Toshiki Asao

Shimane University

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Shingo Matsumoto

Shimane University

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Nobuo Kobayashi

Shimane University

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Norihiro Ito

Shimane University

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Tadashi Asahira

Kyoto University

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Hisafumi Ueda

Shimane University

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Junko Kasuga

Shimane University

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Kiyoshi Ohta

Kyoto University

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Noriyuki Ohtani

Shimane University

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