Comparisons of Water Behavior and Moisture Content between Rockwools and Coir used in Soilless Culture

Jong Hwa Shin; Jung Eek Son

doi:10.12791/KSBEC.2015.24.1.039

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2015 Vol.24, Issue 1 Preview Page Next Page

Comparisons of Water Behavior and Moisture Content between Rockwools and Coir used in Soilless Culture 무토양재배용 암면과 코이어 배지의 수분 이동 및 함수율 특성 비교

31 January 2015. pp. 39-44

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Abstract

To improve crop productivity with optimal water management in soilless culture, the information of physical characteristics of the root medium including water behavior should be required. The objectives of this study were to analyze the physical characteristics including hydraulic properties of the root media commercially used and to analyze the relationships between actual moisture content and measured one by FDR sensor. The weight of the medium was measured by load cell for calculating the actual moisture content. The accuracy of the moisture content measured by FDR sensor was obtained by comparing with the actual one. The water holding capacity of the coir was lower than those of the rockwool due to the features of large and rough particles of the coir. The moisture content measured by FDR sensor showed large difference from the actual moisture contents measured by loadcell, indicating that the calibration of FDR sensor is needed before starting measurement. The optimum range of moisture content for irrigation control was narrow in the coir than the rockwool due to the lower water holding capacity and rehydration capability of the coir. The results of this study can be useful in establishing adequate irrigation strategies in the soilless culture.

Keywords

drainage characteristics

FDR

physical characteristics

root medium

water holding capacity

무토양재배에서 작물의 생산성 향상을 위하여 최적의 수분관리가 중요하기 때문에, 배지의 종류에 따른 수분 이동을 포함한 배지의 물리적 특성의 분석이 필요하다. 본 연구의 목적은 현재 상업적으로 많이 이용되고 있는 대표적인 배지를 대상으로 물리적 특성을 분석하고 수분 의 이동 형태 및 함수율과 FDR 센서 측정값과의 관계 를 파악하는 것이다. 로드셀을 이용하여 배지의 중량을 측정하고, 이 데이터를 바탕으로 배지의 기본적인 물리 적 특성을 파악하고자 하였다. 중량에 따른 실제 함수율 과 FDR 센서값의 비교를 통해 배지 종류에 따른 FDR 의 정확성을 비교하였다. 암면에 비하여 코이어 배지는 입자가 크고 거친 특성 때문에 전체적으로 보수력이 낮 았다. 중량 기준의 동일 함수율 조건에서 FDR센서 측정 값은 코이어에서 큰 오차를 보였으므로 FDR센서 사용 전 보정이 필요하다. 그리고 코이어의 낮은 보수력과 재 수화력 때문에 관수제어에 적합한 함수율 범위도 암면에 비하여 좁았다. 무토양재배에서 최적 관수제어를 위한 관수전략 수립에 실험을 통한 위와 같은 데이터가 유용 하게 이용될 수 있을 것으로 기대된다.

키워드

배액특성

양수분공급

인공배지

주파수영 역 반사계

함수율측정

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Information

Publisher :The Korean Society for Bio-Environment Control
Publisher(Ko) :(사)한국생물환경조절학회
Journal Title :Protected Horticulture and Plant Factory
Journal Title(Ko) :시설원예ㆍ식물공장
Volume : 24
No :1
Pages :39-44
Received Date : 2015-01-29
Revised Date : 2015-02-24
Accepted Date : 2015-03-03
DOI :https://doi.org/10.12791/KSBEC.2015.24.1.039

Journal of Bio-Environment Control ISSN:1229-4675(Print) 2765-3641(Online) 생물환경조절학회지

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