Relationship between positions of CO<SUB>2</SUB> supply in a canopy of tomato grown by high-wire system and distribution of CO<SUB>2</SUB> concentration in a greenhouse

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  • KUMAZAKI Tadashi
    Research Center for Agrotechnology and Biotechnology, Toyohashi University of Technology
  • IKEUCHI Yuya
    Department of Environmental and Life Sciences, Toyohashi University of Technology
  • TOKAIRIN Takayuki
    Department of Environmental and Life Sciences, Toyohashi University of Technology Department of Architecture and Civil Engineering, Toyohashi University of Technology

Bibliographic Information

Other Title
  • ハイワイヤー栽培のトマト群落におけるCO<SUB>2</SUB>施用位置とハウス内のCO<SUB>2</SUB>濃度分布の関係
  • ハイワイヤー栽培のトマト群落におけるCO₂施用位置とハウス内のCO₂濃度分布の関係
  • ハイワイヤー サイバイ ノ トマト グンラク ニ オケル CO ₂ シヨウ イチ ト ハウス ナイ ノ CO ₂ ノウド ブンプ ノ カンケイ
  • Relationship between positions of CO2 supply in a canopy of tomato grown by high-wire system and distribution of CO2 concentration in a greenhouse

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Description

This study aimed to propose an effective positions of CO2 supply in tomato plants grown by high-wire system to reduce CO2 leakage from a naturally ventilated greenhouse. CO2 was supplied at two different positions within the tomato canopy, and CO2 concentration was measured at different heights above the ground within or outside the canopy under ventilated or unventilated conditions in the greenhouse. CO2 supply started below 400 µmol mol-1 of the CO2 concentration measured at 2.4 m above the ground and stopped at 450 µmol mol-1. When CO2 was supplied at the base of the canopy (0.6 m above the ground), the CO2 concentration near the top of the canopy (2.4 m above the ground) was below 400 µmol mol-1 in some cases. On the other hand, when CO2 was supplied at the middle layer of the canopy (1.2 m above the ground), the CO2 concentration within the canopy (1.2 to 2.4 m above the ground) was maintained around 450 µmol mol-1 regardless of ventilated or unventilated conditions. The CO2 concentration below the roof windows (4.2 m above the ground) was hardly increased by changing the position of CO2 supply from 0.6 to 1.2 m above the ground. The CO2 concentration at 4.2 m above the ground under unventilated condition was slightly above 400 µmol mol-1, which was almost the same as that under ventilated condition. In summary, it was suggested that the CO2 supply at the middle layer of the canopy was more appropriate than at the base of the canopy to elevate the CO2 concentration within a canopy of tomato grown by high-wire system. In addition, the CO2 supply at the middle layer of the canopy was seemed to have a low CO2 leakage from the top windows even in the ventilated greenhouse.

Journal

  • Climate in Biosphere

    Climate in Biosphere 21 (0), 54-59, 2021

    The Society of Agricultural Meteorology of Japan

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