생물환경조절학회지 (Journal of Bio-Environment Control)

  • 제14권2호
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  • Pages.119-127
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  • 2005
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  • 1229-4675(pISSN)
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  • 2765-3641(eISSN)
한국생물환경조절학회 (The Korean Society for Bio-Environment Control)
권호 표지

Mg시비농도가 절화국 'Biarritz지 생육과 양분 흡수에 미치는 영향

Effect of Mg Concentration in Fertigation Solution on Growth and Nutrient Uptake of Cut Chrysanthemum 'Biarritz'

  • 발행 : 2005.06.01
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초록

Mg의 시비농도를 인위적으로 조절한 후 국화를 재배하면서 각 원소의 시비수준이 생육과 절화 품질에 미치는 영향을 구명하고 생육을 우수하게 유지할 수 있는 식물체 및 토양의 한계농도를 밝히기 위하여 수행하였다. Mg 결핍증상은 노엽의 엽맥이 갈변한 후엽 전체로 갈변 현상이 확산되고, 최종적으로 노엽이 탈락하는 특징을 나타내었다 Mg 시비농도가 증가할 수록 정식 109일 후의 절화중이 무거워져 1.5mM 시비 구에서 8.84g이었다. 건물 중은 Mg 시비농도가 증가함에 따라 건물중도 증가하였으나, 2.0mM 이상의 고농도 시비구에서는 오히려 감소하였다. 0.5, 1.0 및 1.5mM 시비구에서의 건물중이 8.42, 8.75 및 8.84g이었고, 최근에 완전히 전개된 잎의 Mg함량이 각각 0.34, 0.53 및 $0.71\%$였다. 따라서 절화국 'Biarritz'의 품질을 우수하게 유지하기 위해서는 가장 최근에 완전히 전개된 잎(최상위에서 $3\~4$번째 잎)의 건물중을 기준으로 $0.64\%$ 이상이 유지되도록 시비해야 하며, 건물중이 가장 무거웠던 1.5mM의 토양 용액내 농도를 고려할 때 $3.68mg{\cdot}L^{-1}$ 이상의 Mg 농도가 되도록 시비하여야 한다.

This study was carried out to investigate the effect of magnesium concentrations in fertilizer solution on growth and cut flower quality of chrysanthemum 'Biarritz'. The nutrient concentrations in plant tissue and soil solution of root media were also determined. Magnesium deficiency appeared on older leaves with interveinal yellow-green chlorosis. Marginal chlorosis and necrosis also developed on some of older leaves. Elevation of Mg concentration in fertilizer solution increased cut flower weight at harvesting stage resulting in the 8.84g in 1.5mM treatment. Dry weight of whole above ground plant tissue increased as Mg concentrations in fertilizer solution were elevated within the range from 0 to 15mM, but that of 20mM decreased compared to 15mM treatment. The dry weight of 0.5, 1.0 and 1.5mM treatments were 8.42, 8.75 and 8.848 and tissue Mg contents of those based on the youngest fully expanded leaves at harvesting stage were 0.34, 0.53 and $0.71\%$, respectively. Based on dry weight and tissue Mg contents, Mg fertilization to maintain tissue contents higher than $0.64\%$ is necessary to ensure flower quality and yield. By considering the concentration in 15mM treatment, Mg concentration in soil solution of root media should be higher than $3.68mg{\cdot}L^{-1}$ at harvesting stage.

키워드

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