‘매향’ 딸기의 칼슘 영양진단을 위한 결핍증상 및 식물체 내 한계농도

국문 초록 (Abstract)

국내육성 딸기 신품종인 ‘매향’을 Ca 농도를 조절한 관비용액으로 재배하면서 결핍증상의 특징과 결핍증상을 유발하는 건물중 및 생체즙액내 한계농도를 구명하기 위하여 본 연구를 수행하였다. Ca 결핍증상은 신엽에서 발생하였고, 신엽의 엽맥 부분이 갈변하는 증상과 함께 신엽이 기형화되면서 선단부가 괴사하는 증상이었다. 정식 후 120일에 지상부의 생육을 조사한 결과 엽수, 엽장, 엽병장, 생체중 및 건물중은 4.5mM과 6mM 시비구에서 생육이 우수하였고, 3mM 이하나 9mM의 칼슘 농도에서 생장량이 적어 2차곡선회귀가 성립하였고 경향이 뚜렷하였다. 식물체당 건물중 4.9g에서 2차 곡선회귀의 정점이 형성되었으며(y=2.4026＋1.0209x－0.0985x², R²=0.3546<SUP>***</SUP>), 최대 생장량의 90% 이상 생장량을 최저 한계점으로 설정하면 식물체당 약 4.4g 이상의 건물중을 생산해야 하며 건물중에 기초한 Ca 함량이 1.6~2.25%의 범위에 포함되도록 시비량을 조절해야 할 것으로 판단하였다. 생체중도 Ca 시비농도에 대하여 2차 곡선회귀적인 반응을 보였으며(y=9.273＋4.882x－0.4245x², R²=0.4935<SUP>***</SUP>), 식물체당 23g에서 정점이 형성되었다. 최대 생장량의 90% 이상을 확보하려면 엽병 추출액의 Ca 농도가 63~79㎎ㆍ㎏?¹의 범위에 포함되도록 Ca 시비농도를 조절해야 한다고 판단하였다.

다국어 초록 (Multilingual Abstract)

Objective of this research was to investigate the effect of calcium concentrations in the fertilizer solution on growth and development of Ca deficiency in 'Maehyang' strawberry (Fragaria×ananassa Duch.). The margins of the youngest leaves were scorched and they developed a cupped shape as they were expanded in Ca deficient plants. The vein area of the youngest leaves became brown when the deficiency became severe. The quadratic responses were observed in dry weight production to elevated Ca concentrations in fertilizer solutions with the highest growth in 4.5 mM treatment. The regression equation was y=2.4026＋1.0209x－0.0985x² (R²=0.3546<SUP>***</SUP>). However, tissue Ca contents increased lineally as the Ca concentrations in fertilizer solutions were elevated (y=1.2108＋0.1333X, R²=0.9189<SUP>***</SUP>). In changes of the fresh weight and Ca concentrations in petiole sap, fresh weight production showed quadratic responses to elevated Ca concentrations in fertilizer solution, but Ca concentration increased lineally. The equations in changes of fresh weight and Ca concentrations were y=9.273＋4.882x－0.4245x² (R²=0.4935<SUP>***</SUP>) and y=52.311＋3.2917x(R²=0.6918<SUP>***</SUP>), respectively. When the concentration of calcium at which plant growth was retarded by 10% is regarded as critical concentration level, the calcium contents based on dry weight of above ground plant tissue and in petiole sap should be in the range between 1.6 to 2.25% and 63 to 79 ㎎ㆍ㎏?¹, respectively.

목차 (Table of Contents)

• Abstract
• 서언
• 재료 및 방법
• 결과 및 고찰
• 적요
• 인용문헌

참고문헌 (Reference)

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