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2014 Vol.32, Issue 2 Preview Page
Growth Model of Sowthistle (Ixeris dentata Nakai) Using Expolinear Function in a Closed-type Plant Production System

완전제어형 식물 생산 시스템에서 선형 지수 함수를 이용한 씀바귀의 생육 모델

Mi-Kyung Cha1
,
Son Jung-Eek2,3
,
Cho Young-Yeol4,5*
차 미경1
,
손 정익2,3
,
조 영열4,5*
1Major in Plant Resources and Environment, Jeju National University
2Department of Plant Science, Seoul National University
3Research Institute for Agriculture and Life Sciences, Seoul National University
4Major in Horticultural Science, Jeju National Universit
5Research Institute for Subtropical Agriculture and Animal Biotechnology, Jeju National University
1제주대학교 식물자원환경전공
2서울대학교 식물생산과학부
3서울대학교 농업생명과학연구원
4제주대학교 원예환경전공
5제주대학교 아열대농업생명과학연구소
*교신저자. *Corresponding Author. 
30 April 2014. pp. 165-170
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Abstract

The objective of this study was to make growth and yield models of sowthistle (Ixeris dentata Nakai) by using an expolinear functional equation in a closed-type plant production system. The growth and yield of hydroponically-grown sowthistle were investigated under four different planting distances (15 × 10, 15 × 15, 15 × 20, and 15 × 25 cm). Shoot dry weights per plant was the highest at 15 × 25 cm, but was the lowest at 15 × 10 cm. Shoot dry weights per area was the highest at 15 × 15 cm, but was the lowest at 15 × 25 cm. The optimum planting density and planting distance for yield of sowthistle were 44 plants/m2 and 15 × 15 cm, respectively. Shoot dry weights per plant and per area were showed as an expolinear type functional equation. A linear relationship between shoot dry and fresh weights was observed to be linear regardless of the planting distance. Crop growth rate, relative growth rate and lost time in an expolinear functional equation showed quadratic function form. Radiation use efficiency of sowthistle was 4.3-6.1 g･MJ-1. The measured and estimated shoot dry weights showed a good agreement using days after transplanting as input data. It is concluded that the expolinear growth model can be a useful tool for quantifying the growth and yield of sowthistle in a closed-type plant production system.

Keywords
hydroponics
modeling
planting distance
plant factory
shoot dry weight per area

본 연구는 완전제어형 식물공장에서 선형 지수 함수를 이용하여 재식거리(15 × 10, 15 × 15, 15 × 20, 15 × 25cm)에 따른 씀바귀의 생육과 수량 모델을 개발하고자 수행되었다. 개체당 건물중은 25cm 처리구가 가장 높았으며, 10cm 처리구가 가장 낮았다. 단위면적당 건물중으로 보면 15cm 처리구가 가장 높았으며, 25cm 처리구가 가장 낮았다. 따라서 씀바귀 생육을 위한 적정 재식밀도와 재식거리는 각각 44 plants/m2와 15 × 15cm였다. 정식 후 일수에 따른 건물중의 변화 곡선은 선형 지수적인 형태를 보였으며, 재식거리에 따른 선형 지수 형태를 이용하여 모델식을 예측할 수 있었다. 개체당 건물중과 개체당 생체중과의 관계는 재식거리와는 무관하게 직선적인 관계를 보여, 건물중 예측으로 생체중도 예측할 수 있었다. 선형 지수 함수식에서 작물생장율과 상대생장율, lost time는 쌍곡선 형태를 보였다. 씀바귀의 광사용효율는 4.3-6.1g･MJ-1였다. 재식거리에 따른 씀바귀의 생육과 수량은 선형 지수 함수식으로 정확하게 예측할 수 있었다. 결론적으로, 선형 지수 함수는 완전제어형 식물공장에서 씀바귀의 생육과 수량을 예측하는데 유용한 함수였으며, 생육과 수량 모델을 개발할 수 있었다.

키워드
수경재배
모델링
재식거리
식물공장
단위면적당 건물중
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 32
  • No :2
  • Pages :165-170
  • Received Date : 2013-09-02
  • Revised Date : 2013-10-12
  • Accepted Date : 2013-11-19
  • DOI :https://doi.org/10.7235/hort.2014.13141
Journal Informaiton Horticultural Science and Technology Horticultural Science and Technology
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