Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Water Content Characteristics of Coconut Coir Substrates on Different Mixture Ratios and Irrigation Rates and Times

코코넛 코이어 혼합 조성, 급액량 및 급액횟수에 따른 배지 수분 특성

Park, Sung-Tae;Choi, Ki-Young;Lee, Yong-Beom
박성태;최기영;이용범

  • Published : 20100400
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Abstract

This experiment was conducted to investigate the water content characteristics of coconut coir substrates on component (dust + fiber or chip) ratios and irrigation rates and times using FDR (Frequency domain reflectometry) sensor for rose in bag culture (35 L) hydroponics from January to May 2008. When water supply rate was 60 mL, average water contents of substrate were 48.7, 42.7, 37.1, 35.8 and 34.8% for 0, 10, 20, 30 and 50% of fiber mixed substrates, respectively and 51.1, 45.3, 37.6 and 30.3% in 0, 30, 60 and 80% of chip mixed substrates, respectively. The margins between maximum and average water contents were the smallest for the substrates with 20% fiber and 30% chip. Substrate with 20-30% of fiber or chip looked appropriate for hydroponics because of low water content variation. Water content changes by water supply rates were investigated with 20% of fiber mixed substrates. The total amount of daily water supply was 600 mL per plant with 30, 45, 60, 90, 120 or 150 mL each time. The average, minimum and maximum water contents of the substrates were 35.4-37.7, 31.7-34.1 and 37.4-41.4%, respectively. It was possible to reach average water content with water supply over 60 mL each time. Margin between average water content and minimum water content was the smallest with water supply of 60-90 mL each time. The water supply of 60-90 mL each time was proper for the coconut coir substrate with 20% fiber.

2008년 1월부터 2008년 5월까지 코코넛코이어 배지를 이용한 자루재배형(35L) 장미 수경재배에서 FDR(Frequency domain reflectometry) 센서를 사용하여 코이어 혼합(fiber 또는 chip) 조성, 급액량과 공급횟수 차이에 따른 배지 내 수분함량 변화 특성을 측정하였다. 하루 급액량을 1회 60mL, 총 10회 공급하였을 때 배지 내 평균 수분 함량은 fiber함량이 0, 10, 20, 30, 50%인 배지에서 각각 48.7, 42.7, 37.1, 35.8, 34.8%였고 chip함량이 0, 30, 60, 80%인 배지에서도 각각 51.1, 45.3, 37.6, 30.3%였다. 배지간 최고수분함량과 최저수분함량의 차이는 fiber함량이 20%인 배지와 chip의 함량 Kor. J. Hort. Sci. Technol. 28(2), April 2010 233이 30%인 배지에서 가장 낮았다. 따라서 배지의 수분 함량의 변동이 적고 일정하게 유지되는 장미 수경재배에서 fiber 와 chip수준은 20-30%가 적합하였다. Fiber가 20% 함유된 코이어배지에서 1일 급액량을 주당 600mL로 고정하고 1회 급액량을 30, 45, 60, 90, 120 및 150mL로 급액했을 때 배지 내 평균 수분함량은 35.4-37.7%, 최저 수분함량은 31.7-34.1%, 최대 수분함량은 37.4-41.4%이었다. 60mL 이상의 급액은 1회의 급액 만으로 평균수분함량에 도달하였다. 평균수분함량과 최저수분함량간의 차이는 1회 급액량이 60-90mL 공급될 때 가장 낮았다. 따라서 급액량을 60-90mL/회로 설정하고 수분의 필요 유무에 따라 급액 횟수를 조절하여 관리하는 것이 적절한 것으로 판단하였다.

Keywords

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