배지 및 재식밀도가 심지양액재배 씨감자의 생육 및 수량에 미치는 영향

Effects of Medium and Planting Density on Growth and Yield of Seed Potatoes Grown in a Wick Hydroponic System

This study was carried out in 2002 to deter-mine the usefulness of Jeju scoria for a component of a growth medium and optimum planting density of ‘Dejima’ seed potatoes (Solanum tuberosum L.) grown in a wick hydroponic system. The minitubers (7.0±0.2 g) produced in an aeroponics system were planted at five planting den-sities (3 to 15 tubers/box; 19 to 95 tubers/m2) in poly-styrene boxes (51 cm long × 31 cm wide × 20 cm high) containing two media (perlite + peatmoss and Jeju scoria + peatmoss 1:2, v/v mixtures). There were no significant interactions between medium and planting density for the growth and tuber yield traits. Shoot growth and the number of tubers per plant were not significantly affected by the media. However, tuber yield was higher in the perlite + peatmoss mixture than in the Jeju scoria + peatmoss mix-ture. The percentage of underdeveloped plants ranged from 8.3 to 14.7% at four lower planting densities (3 to 12 tubers/ box), and was 25.8% at the highest planting density (15 tubers/box). As planting density was increased from 3 to 15 tubers per box, seed potato ( 5 g tuber) number in ≥ - creased from 101 to 269 and yield from 6.3 to 11.6 kg/m2. These results indicate that the perlite + peatmoss mixture might be more suitable for seed potato production in the wick hydroponic system, and considering the percentage of underdeveloped plants and tuber yield, optimum planting density would be 56 to 76 tubers/m2 in the system depend-ing on availability of seed potatoes.