Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Cooling Efficiency and Growth of Tomato as Affected by Root Zone Cooling Methods in Summer Season

고온기 근권냉방방식에 따른 냉방효과와 토마토 생육

  • Published : 2002.06.01
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Abstract

This study was conducted to investigate the cooling efficiency and growth of tomatoes by root zone cooling device using a pad-box and cultivated system. The structure of the root zone cooling system using a pad-box was four piece of pads bonded an the side and a fan set at the bottom. Cool wind was generated by the outside air which was punched at intervals of 10 cm along three rows. Cold wind flowed to the root zone in the culture medium. The root zone cooling efficiency of cold wind generation by using a pad-box flowing through a wet-pad was determined. Major characteristic of this cuttural system consist of bed filled with a perlite medium and a ventilation pipe using PVC. The cold wind generation by a pad box (CWP) was compared to that of cold wind generation by a radiator (CWR), cold water circulation using a XL-pipe (CWX) and the control (non-cooling). When the temperature of water supplied was 16.2-18.4$^{\circ}C$, temperatures in the medium were 20.5~23.2$^{\circ}C$ for CWP 22.7~24.2$^{\circ}C$ for CWR, 22.8~24.27$^{\circ}C$ for CWX and 23.1~-29.6$^{\circ}C$ for the control. The results show that the cold wind temperature using the pad-box was lower by 1~2$^{\circ}C$ than that of cold water circulation in the XL-pipe and lower by 5~6$^{\circ}C$ than that of the control. Growth such as leaf length, leaf width, fresh weight and dry weight, was greater in three root zone cooling methods than in the control. Root activity was higher in the rat zone cooling methods than in the control. However, there was no significant difference among root zone cooling methods.

근권냉방 방식에 따른 냉방 효율과 토마토 생육 특성을 검토하고자 XL냉수순환, 라디에이타 냉풍, 패드냉풍 및 대조구를 처리한 결과는 다음과 같다. 근권부 냉방온도는 공급수온이 17.8$^{\circ}C$일 때 XL 냉수순환구는 18.$0^{\circ}C$ 라디에이타 냉풍구는 27.2$^{\circ}C$, 패드 냉풍구는 20.3$^{\circ}C$였다. 배지 깊이와 시간대별 평균온도는 XL냉수순환구 22.8~24.7$^{\circ}C$. 라디에이타 냉풍구 22.7~24.2$^{\circ}C$, 패드 냉풍구 20.5~23.2$^{\circ}C$, 대조구 25.9~29.6$^{\circ}C$를 나타내어 냉방처리구가 대조구에 비해 5~6$^{\circ}C$더 낮았다. 토마토의 생육에 있어 엽장. 엽폭은 대조구에 비해 컸으며, 생체중 및 건물중의 경우에서도 비슷한 경향이었다 근활력에 있어 대조구는 45.0ug/g에 비해 근권냉방 처리구는 58.5-62.8 ug/g으로 높았으나. 근권냉방 처리구간에는 큰 차이가 없었다.

Keywords

References

  1. Carpenter, W.J. and W.W. Willis. 1959. Compari-sonofevaporative fan-and-pad and high pressure mist-systems for greenhouse cooling. Proc. Amer. Soc. Hort. Sci. 74:711-718
  2. Fujishige, A.J. 1973. Influence of rooting-medium tem-perature on growth of Lycopersicon esculentum. Ann. appl. Biol.74.:379-385 https://doi.org/10.1111/j.1744-7348.1973.tb07758.x
  3. Kojima, K. and H. Suhardiyanto. 1991. Studies on the zone cooling system in greenhouse(1). Performance of the system in amodel sized greenhouse. Environ. Control in Biol 29(1): 1-10 https://doi.org/10.2525/ecb1963.29.1
  4. Kozai, T., Z. Quan, and M.H ayashi, I. Watanabe, T. Shinko, and H. Higuchi. 1986. Cooling load of a greenhouse (2). Reduction of the cooling load in night-time. J. Agr. Met.41:351-357 https://doi.org/10.2480/agrmet.41.351
  5. Lee, B.S., S.J. Ctiung, J.G. Kang, B.S. Sea. 1999. Effects of bed structures on the growt hand cut flower-quality of hydroponically grown crysanthemum. J. kor. Soc. Hort. Sci. 40(1): 112-116 (in Korean)
  6. Lee, J.S., Y.H. Kim. B.Y. Ryu and H.S. Noh. 1999. Experimental analys isofseveral dropping method air temperature for summer culture flower crops in the experimental plastic house. J. kor. Soc. Hort. Sci. 40(4) :495-499 (in Korean)
  7. Lee. G.M. 1994. Management for fruit vegetables of greenhouse in warm season, Protected Horticulture. The Korean Research Society for Protected Horticulture. 7(1):23-31 (in Korean)
  8. Park, K.W., Y.B.Lee, N.H. Choi and J.C. Jeong. 1990. Effects of culture media and nutrient solution on the yield and quality of cucumber (Cucummis sativus L.) and tomato (Lycopersicon esculentum Mill.). Korea J. Environ. Agric. 9:143-151 (in Korean)
  9. Quan, Z. and T. Takakura. 1988. Estimation ofthe sea-sonal cooling or heating load using a simulation model. J. Agr. Met. 44:187-194 https://doi.org/10.1016/0168-1923(88)90017-2
  10. Udagawa,Y., T.Ito. and K. Gomi. 1991. Effects of root temperature on the absorption of water and mineral nutrients by strawberry plants 'Reiko' grown hydro-ponically. J. Japan. Soc. Hort. Soc. 59:711-717 (in Japanse) https://doi.org/10.2503/jjshs.59.711
  11. Woo, Y.h., J.M. Lee, H.J. Kim and Y.S. Kwon. 1996. Prediction of maximum air temperature and cooling load of glasshouse during summer. J. kor. Soc. Hort. Sci. 37(3):479-485
  12. Youshia, M. 1996. Activity measurement of root. J Sci. Soil Manure 37(1): 63-68