Effects of Low Nighttime Air Temperature and High Electrical Conductivity of Nutrient Solution on the Growth and Yield of Sweet Pepper (<i>Capsicum annuum</i> L.) in a Venlo-type Greenhouse

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  • 高軒高温室における夜間気温および養液濃度の違いがパプリカの生育と収量に及ぼす影響
  • コウノキダカ オンシツ ニ オケル ヤカン キオン オヨビ ヨウエキ ノウド ノ チガイ ガ パプリカ ノ セイイク ト シュウリョウ ニ オヨボス エイキョウ

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Effects of low nighttime air temperature (LNT) and high electrical conductivity (HEC) of a nutrient solution on the growth and yield of sweet pepper (Capsicum annuum L.) were investigated during winter (Oct 25, 2014 to Feb 28, 2015) in an experimental Venlo-type greenhouse in Kochi Prefecture. A “pre-night temperature drop,” which is a quick drop in the air temperature early in the nighttime, is often used in large-scale greenhouses. In this study, the length of the pre-night temperature drop was extended from 3 h (control) to 9 h (LNT), and the electrical conductivity of the nutrient solution supplied to the plants was increased from 2–3 dS m-1 (control) to 3–4 dS m-1 (HEC). The effects of LNT and HEC on the growth of sweet pepper differed between the periods before and after the winter solstice. Before the winter solstice, LNT significantly reduced the rates of stem elongation and node formation by 34% and 32%, respectively, whereas after the winter solstice, HEC became the key factor influencing the reduction in the rate of stem elongation, but neither LNT nor HEC affected the rate of node formation. Neither LNT nor HEC affected the leaf photosynthetic ability, or the number or dry weight of fruits, but HEC did reduce the total yield by inhibiting leaf expansion and fruit enlargement.

Journal

  • Eco-Engineering

    Eco-Engineering 28 (2), 29-36, 2016

    The Society of Eco-Engineering

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