Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Mycorrhizae Formation, Growth and Mineral Nutrient Uptake of Poncirus trifoliata in Response to P Application in Volcanic Ash Soil

화산회토양에서 인산 시용 수준별 탱자 유묘의 공생균근 형성과 생육 및 무기양분 흡수

  • Kang, Seok-Beom (Faculty of Horticultural Life Science, Cheju National University,) ;
  • Moon, Doo-Khil (Faculty of Horticultural Life Science, Cheju National University,) ;
  • Chung, Jong-Bae (Department of Agricultural Chemistry, Daegu University)
  • 강석범 (제주대학교 원예생명과학부) ;
  • 문두길 (제주대학교 원예생명과학부) ;
  • 정종배 (대구대학교 생명환경학부)
  • Received : 2003.08.14
  • Accepted : 2003.09.22
  • Published : 2003.10.30
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Abstract

Mycorrhizae is well known to increase the uptake of P and other mineral nutrients of plants. But if available P levels in soil is too low or high, mycorrhizae formation is limited. This study was carried out to determine the optimum level of available P for mycorrhizae formation of Poncirus trifoliata (trifoliate orange) seedling in volcanic ash soil. Eight levels of P in the range $0-1050mg\;kg^{-1}$ were applied with double superphosphate, and in each P level mycorrhizal fungi inoculated and uninnoculated treatments were included. The seedlings were grown in a greenhouse for 5 months and mycorrhizae formation, growth, and nutrient uptake were measured. As P application level increased, mycorrhizae formation increased at lower range of P application and the highest formation ratio of 43% was found at $100mg\;kg^{-1}$ P level ($2.6mg\;kg^{-1}$ available P in soil). At further higher levels of P application, mycorrhizae formation was rather suppressed. Seedling growth was increased by the inoculation of mycorrhizal fungi, and maximum growth was found at $100mg\;kg^{-1}$ P level where mycorrhizae formation was highest. The growth and mineral nutrient uptake of Poncirus trifoliata seedling represented a significant positive correlation with mycorrhizae formation at all P treatments.

공생균근은 식물 뿌리에 의한 인산 등 무기염류의 흡수를 촉진시키지만 토양의 인산 농도 가 너무 낮거나 높으면 공생균근 형성이 억제되는 것으로 알려져 있다. 본 연구는 화산회토양에서 감귤 뿌리의 공생균근 형성에 적합한 유효인산 수준을 구명하기 위하여 수행하였다. 중과석을 인 공급원으로 하여 인산 시용량을 $0-1000mg\;kg^{-1}$으로 달리한 토양에서 공생균근균 접종과 비접종 처리로 나누어 탱자 유묘를 화분에 심어 유리온실에서 5개월 동안 재배하였다. 탱자 유묘의 공생균근 형성율은 인산 무시용구(유효인산 함량 $0.73mg\;kg^{-1}$)에서 33%이었는데, $50mg\;kg^{-1}$ 시용구(유효인산 함량 $2.6mg\;kg^{-1}$)에서 43%로 증가되었지만 $200mg\;kg^{-1}$ 시용구(유효인산 함량 $8.3mg\;kg^{-1}$)에서는 34%로 무시용구와 비슷하였고 그 이상 인산 시용량이 증가함에 따라 형성율은 오히려 감소하였다. 공생균근균의 접종으로 초장, 생체중 및 건물중 등으로 측정된 탱자 유묘의 생장은 비접종 처리구와 비교하여 모든 인산 처리 수준에서 증가되었으며, 그 증가량은 공생균근 형성율에 비례하였다. 그리고 탱자 유묘의 인산을 비롯한 무기양분 흡수량도 모든 인산 처리 수준에서 공생균근 형성율과 높은 정의 상관관계를 보였다.

Keywords

References

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