Effect of Minimal Air Temperature on Yield and Fruit Quality of 'Mizunasu' Eggplant Grown in Heated Plastic House

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  • Suzuki Toshiyuki
    Agricultural, Food and Environmental Sciences Research Center of Osaka Prefecture
  • Tsuji Hiromi
    Agricultural, Food and Environmental Sciences Research Center of Osaka Prefecture
  • Morikawa Shinya
    Agricultural, Food and Environmental Sciences Research Center of Osaka Prefecture

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Other Title
  • ‘水ナス’の加温栽培における最低気温が収量および果実品質に及ぼす影響
  • ミズナス ノ カオン サイバイ ニ オケル サイテイ キオン ガ シュウリョウ オヨビ カジツ ヒンシツ ニ オヨボス エイキョウ

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‘Mizunasu’ eggplants were grown in heated plastic houses kept at the minimum air temperature of 14°C, 16°C and 18°C. At 14°C, low temperature injuries were observed and marketable yield was remarkably lower than that at 16°C or 18°C. The yield and fruit color at 16°C were similar to those at 18°C. The fruit shape at 16°C was slightly more slender than that at 18°C. At 16°C, the mesocarp of the fruit was firm and the NaCl permeability into the fruit was decreased compared to that at 18°C. However, the ‘Mizunasu’ eggplant fruit is valued mainly by the appearance (fruit color and shape) in the present markets, so the market value of fruit cultivated at 16°C was similar to that at 18°C. On estimation by yield, the appearance of fruits and the heating cost, the minimum air temperature of 16°C was suitable for ‘Mizunasu’ eggplant production in heated plastic houses.

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