행거형 지주를 활용한 씨 없는 수박 수경재배에서 온실 내 생육 위치별 환경과 광합성 특성 비교

Comparison of Environmental and Photosynthetic Characteristic Factors between Growing Locations in Seedless Watermelon Greenhouse Hydroponic Cultivation Using a Pillar of Hanger System

This study was conducted to compare differences in the environmental and photosynthetic characteristics between growing locations in hydroponic cultivation of seedless watermelon (Citrullus lanatus) ‘Minimi’ in a greenhouse using pillar of hanger-type. The type of greenhouse was a single-span greenhouse (width:height = 6.0:3.3 m), and growing locations were the front (south, SL) and back (north, NL) in a greenhouse with a north-south direction. During the study period (early October to late November), daily average solar radiation (PPFD) inside the greenhouse showed a much larger change than the daily average air temperature and peaked from 12:00 to 13:00, while the air temperature did not change much from 11:00 to 13:00. The solar radiation (PPFD) at the top of the plants inside the greenhouse was significantly higher in SL (1.26 times) than in NL, but R:FR showed no difference. Plant leaf temperature and light intensity showed significant correlations with stomatal conductance, transpiration rate, and vapor pressure deficit at both locations. These correlations were higher in NL with lower solar radiation and later exposure to higher light intensities than in SL.

This study was conducted to compare differences in the environmental and photosynthetic characteristics between growing locations in hydroponic cultivation of seedless watermelon (Citrullus lanatus) ‘Minimi’ in a greenhouse using pillar of hanger-type. The type of greenhouse was a single-span greenhouse (width:height = 6.0:3.3 m), and growing locations were the front (south, SL) and back (north, NL) in a greenhouse with a north-south direction. During the study period (early October to late November), daily average solar radiation (PPFD) inside the greenhouse showed a much larger change than the daily average air temperature and peaked from 12:00 to 13:00, while the air temperature did not change much from 11:00 to 13:00. The solar radiation (PPFD) at the top of the plants inside the greenhouse was significantly higher in SL (1.26 times) than in NL, but R:FR showed no difference. Plant leaf temperature and light intensity showed significant correlations with stomatal conductance, transpiration rate, and vapor pressure deficit at both locations. These correlations were higher in NL with lower solar radiation and later exposure to higher light intensities than in SL.