Effects of Minimum Air Temperatures at Seedling Stage on Plant Growth, Yield, and Fruit Quality of Tomatoes Grown on a Single-Truss System.

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  • 育苗時の最低気温が一段栽培トマトの生育ならびに果実の収量と品質に及ぼす影響
  • イクビョウジ ノ サイテイ キオン ガ イチダン サイバイ トマト ノ セイイク ナラビニ カジツ ノ シュウリョウ ト ヒンシツ ニ オヨボス エイキョウ

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Abstract

The effects of minimum air temperatures during the seedling stage on single-truss tomatoes were studied. Tomato seedlings were grown hydroponically in a greenhouse at 5°, 10°, 15° and 20°C 1. As the minimum air temperature increased, plant growth increased. Shoot fresh weight, plant height and leaf area were greatest at 20°C. Leaf number increased in proportion to the integrated effective air temperature. Regression analysis indicated that each cultivar fitted into only one regression line regardless of the minimum air temperature, the regression coefficients of 'Momotaro', 'Multi-first', and 'TVR-2' were 0.0157, 0.0147, and 0.0153, respectively. 2. Seedlings from each minimum temperature treatment were transplanted and grown on a singletruss system at a minimum of 20°C when the flower buds appeared. As the minimum air temperature at the seedling stage was lowered, the number of flowers per plants significantly increased, except for 'Momotaro'. Fruit were heavier on seedlings exposed to 5° and 10°C than at 15° and 20°C, but the number of irregularly shaped fruits significantly increased, so that marketable fruit yield decreased. The Brix of the fruits significantly increased as the seedlings were exposed to higher minimum air temperatures.

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