초록

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칼슘 시비농도를 조절하여 ‘금향’ 및 ‘선홍’ 딸기를 재배하고 시비 수준이 결핍증상 발현, 생장 및 무기원소 흡수에 미치는 영향을 분석 및 비교하여 영양진단 자료로 삼기 위해 본 연구를 수행하였다. 칼슘이 결핍되면 ‘금향’은 신엽의 가장자리가 기형으로 변하였고, ‘선홍’은 신엽의 끝이 갈변하면서 괴사하였다. 칼슘 시비수준이 높아질수록 ‘금향’ 딸기의 생체중은 2차곡선회귀적으로 증가하였고(y=15.88+1.7641x-0.1190x²), 엽병추출액의 Ca 농도는 직선적으로(y=40.01+9.688x)으로 증가하였다. ‘선홍’ 딸기의 생체중도 2차곡선회귀적으로(y=10.80+2.5174x-0.1945x²) 증가하였고, 엽병추출액의 Ca 농도는 직선적으로(y=44.34+3.5970x) 증가하였다. ‘금향’ 및 ‘선홍’의 생체중이 각각 식물체당 22.42g 및 18.95g에서 2차곡선 회귀의 정점이 형성되었으며, 최대생장량의 90% 생장량을 생장억제를 방지할 수 있는 최저한계점으로 간주하면 엽병추출액의 Ca 농도가 79 및 60㎎·㎏^-1 이상을 유지하도록 시비하여야 생장억제를 방지할 수 있다. ‘금향’과 ‘선홍’ 딸기의 지상부 건물중도 2차곡선회귀적으로 증가하였으며(금향 y=3.6926+0.5317x-0.0578x²; 선홍 y=1.8121+0.6008x-0.0475x²) 최대생장량의 90% 생장량을 최저한계점으로 설정하면 건물에 기초한 Ca 함량이 각각 1.45% 및 1.85% 이상을 유지하도록 시비해야 할 것으로 판단하였다. 지상부 생장량 및 엽병추출액의 Ca 농도를 고려할 때 ‘금향’이 ‘선홍’보다 Ca 요구도가 높다고 판단하였다.

Abstract ▼ AI-Helper

Objective of this research was to determine the influence of calcium (Ca) concentration in the fertilizer solution on development of nutrient deficiency symptoms and growth responses in strawberry (Fragaria × ananassa Duch.) ‘Keumhyang’ and ‘Seonhong’. To achieve this, Ca concentrations of above gro...

Objective of this research was to determine the influence of calcium (Ca) concentration in the fertilizer solution on development of nutrient deficiency symptoms and growth responses in strawberry (Fragaria × ananassa Duch.) ‘Keumhyang’ and ‘Seonhong’. To achieve this, Ca concentrations of above ground plant tissue and of petiole sap were analyzed to compare the nutritional condition of Ca which resulted in decreased crop growth. The Ca deficiency symptoms developed on the young leaves with deformed margin in ‘Keumhyang’ and severe necrosis and tip-burn in ‘Seonhong’. Growth response in fresh weight of ‘Keumhyang’ and ‘Seonhong’ to elevated Ca concentrations in the fertilizer solution was quadratic with the greatest fresh weights of 22.42 g in ‘Keumhyang’ (y=15.88+1.7641x-0.1190x²) and 18.95 g in ‘Seonhong’ (y=10.80+2.5174x-0.1945x²) per plant at 120 days after transplanting. The Ca concentrations in petiole sap increased lineally with the equations of y=40.01+9.688x in ‘Keumhyang’ and y=44.34+3.5970x in ‘Seonhong’. When the concentration of Ca which retarded plant growth by 10% was regarded as the threshold level, Ca concentration in petiole sap should be maintained higher than 79 ㎎·㎏-1 in ‘Keumhyang’ and 60 ㎎·㎏-1 in ‘Seonhong’ to prevent the growth suppression. Growth response of dry weight to elevated Ca concentrations in the fertilizer solution was quadratic with equations of y=3.6926+0.5317x-0.0578x² in ‘Keumhyang’ and y=1.8121+0.6008x-0.0475x² in ‘Seonhong’. Tissue Ca contents responded to elevated Ca concentrations in the fertilizer solution and increased lineally in both cultivars. From these equations, lower critical content of Ca was 1.45% in ‘Keumhyang’ and 1.85% in ‘Seonhong’. From these results, we concludeded that ‘Keumhyang’ requires higher Ca in the fertilizer solution for optimal growth than ‘Seonhong’.

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