Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Effects of Diurnal Alternation of Nutrient Solution Salinity on Growth and Fruit Quality of Tomatoes Hydroponically Grown in NFT System

NFT 수경재배시스템에서 주/야 양액농도변환이 토마토의 생육 및 품질에 미치는 영향

  • Kim Ki-Deog (National Institute of Highland Agriculture, RDA) ;
  • Lee Eung-Ho (National Institute of Highland Agriculture, RDA) ;
  • Lee Jae-Wook (National Horticultural Research Institute, RDA) ;
  • Lee Byoung-Yil (Dept. of Horticultural Science, Seoul National University) ;
  • Son Jung-Eek (Dept. of Horticultural Science, Seoul National University) ;
  • Chun Chang-Hoo (Dept. of Horticultural Science, Seoul National University)
  • Published : 2006.03.01
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Abstract

This experiment was conducted to investigate the effects of diurnal alternation of nutrient solution salinity on growth and fruit quality of tomatoes (Lycoperisicon esculentum cv. 'House momotaro') hydroponically grown in root intercept bag-NFT (RIB-NFT) system. Plant height was the lowest in the high concentration during daytime (6/1 $dS\;m^{-1}$, day/night). Yield was very high in the concentration of 1/1 $dS\;m^{-1}$, it decreased with increasing the concentration of nutrient Yield was higher at low concentration (4/1 $dS\;m^{-1}$) at nighttime compared to the same concentration (4/4 $dS m^{-1}$) at daytime and nighttime, and the reverse (1/4 $dS\;m^{-1}$) was similar to the control (perlite culture). Yield was greatly reduced by higher concentration at daytime than nighttime, and the decrease was alleviated by lower concentration at nighttime. With increasing the concentration of nutrient solution during daytime, sugar content of tomato fruit was increased, but yield was decreased. In the other experiment, tomato plants were hydropoically cultured in NFT system diurnally alternated between Aichi's solution and $Ca(NO_3)_2$ solution. $Ca(NO_3)_2$ solution was supplied for 4 hours from 10:00 to 14:00 at daytime and from 22:00 to 2:00 at nighttime, respectively, and Aichi's solution was supplied for the time except the 4 hours. Ca content of leaves and sugar content of fruit were increased by supplying $Ca(NO_3)_2$ solution at daytime compared to nighttime, but plant growth was greatly suppressed by supplying $Ca(NO_3)_2$ solution with the concentration of 4 $dS\;m^{-1}(4/4^{Ca}\;dS\;m^{-1})$ at nighttime.

Keywords

References

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