Abstract
$N(^{15}N)$ and $P(^{32}P)$ absorption by 2 year-old Cymbidium Jungfrau in solution culture were investigated. Growth, photosynthesis rate, chlorophyll content and mineral composition of Cymbidium in the solution culture with bark or granular rockwool were compared with these parameters in the conventional pot culture. Nitrogen absorption by Cymbidium was higher in full sunlight than in 60% of sunlight while P absorption was higher in 60% of sunlight. Sixty seven % of N absorbed in plant was redistributed to the bulb(39%) and leaves(28%) while 46% of P absorbed was fund in the bulb (36.2%) and leaves (10.2%). Accumulation of P in leaves was 3-fold lower than that of N. N and P absorption in 0.5 or 1 year- old daughter plant Bowing vigorously were greater than in immature daughter or mother plant. The absorption rate of phosphorus in Cymbidium was 350-fold lower than that of barley. Greater shoot length and bulb diameter, and higher fresh weight, photosynthesis rate and chloroployll content were observed in the solution culture than in the conventional pot culture. Solution culture had-also more content of N, P, K and Mg in leaves, bulb and root than conventional pot culture but did not that of Ca. A large part of the nutrient absorption was occurred during vegetative growth. Also, There was no difference between bark and rockwool in the solution culture due to the improvement of poor dispersion of nutrient solution in bark.
양액 재배에서 서양 심비디움(Cymbidium Jungfrau)의 질소와 인 흡수 및 재분배양상을 조사하였고 양액 재배와 관행인 화분 재배간의 심비디움의 생육, 광합성, 엽록소함량, 무기물 함량을 비교하였다. 질소$(^{15}N)$의 흡수는 자연광의 60% 광도에서 보다 자연광에서 많았고, 인$(^{32}P)$의 흡수는 이와 반대의 경향을 나타냈다. 흡수된 질소$(^{15}N)$는 벌브에 가장 많이 존재하였고 인$(^{32}P)$은 뿌리와 벌브에 많이 있었으며 잎으로 재분배된 양은 10% 정도였다. 2년생 어미주보다는 0.5 또는 1년생 새끼 주에서 질소$(^{15}N)$와 인$(^{32}P)$의 흡수가 더 많았다. 심비디움의 인 흡수율은 보리의 경우 보다 약 350배 정도 낮았다. 심비디움의 초장, 벌브크기, 생체증가율, 광합성 능, 엽록소 함량은 바크 또는 입상 암면을 배지로 이용하는 양액 재배가 일반 관행재배보다 더 높았다. 특히 양액 재배에서 사용된 바크와 입상 암면간에 생육과 무기물함량이 차이를 보이지 않았다. 또한, 질소, 인, 칼륨, 마그네슘의 함량은 양액 재배에서 높았으나 칼슘은 관행과 차이가 없었고 무기물의 흡수는 주로 영양생장기간 동안에 이루어졌다.
(Applied Radioisotope Research Institute)
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