Physiological Response of Potato Variety to Soil Salinity

This study was conducted to examine the basis for the information to select the suitable potato varieties grown in new reclaimed land. The potatoes of five varieties were planted in the port with 4 different electrical conductivities of saturated extracts of soil taken the Saemangeum reclamation area, which was made of non-treatment salt and three concentrations of salt treatment, 1.6 dS $m^{-1}$, 3.2 dS $m^{-1}$, 4.8 dS $m^{-1}$, respectively. All of the potato varieties were uniformly emerged without missing plant in all treatment groups, even 4.8 dS $m^{-1}$ treatment group. According to the salt concentration of soil, required date to the emergence of the potato comparing to non-treatment salt was delayed 3-4 days in 1.6 dS $m^{-1}$, 6-10 days in 3.2 dS $m^{-1}$, 7-13 days in 4.8 dS $m^{-1}$, respectively, and the number of its branch decreased by 14-58% comparing to non-treatment salt depending on varieties. Since the increase of the salt concentration of the soil was more serious the decrease of the number of its branch, but plant height tended to increase when branch number per plant was small, which was depending on more number of its branch than salt concentration. Fresh tuber yield of potato comparing to non-treatment salt were decrease 33.7% in 1.6 dS $m^{-1}$, 59.5% in 3.2 dS $m^{-1}$, 79.3% 7-13 days in 4.8 dS $m^{-1}$, respectively. The threshold EC starting the growth inhibition of fresh weight decreased was 1.2 dS $m^{-1}$ for Chudong, 1.8 $m^{-1}$ for Chubeak, 1.9 $m^{-1}$ for Chugang and Chuyeong, and 2.0 $m^{-1}$ for Sumi, and EC which decreased 50% of dry weight index was 2.4 dS $m^{-1}$ for Chubaek, 2.45 dS $m^{-1}$ for Chudong, 2.81 dS $m^{-1}$ for Chugang, 3.03 dS $m^{-1}$ for Chuyeong, and 3.29 dS $m^{-1}$ for Sumi. The present results suggest that Sumi is considered to the suitable potato variety grown on saline soils.

토양염농도에 따른 감자 품종들의 생장특성

제염중인 간척지 토양에 감자재배 가능성을 검토코자 새만금 간척지 토양을 대조구를 포함한 4수준의 염농도로 조정하여 충진한 포트에 5개의 감자 품종을 식재하여 시험을 수행하였다. 1. 토양염농도에 따른 감자 입모는 4.8 dS $m^{-1}$까지 결주없이 균일하게 입모 되었다. 염농도별 감자 출현소요일수는 숙전토양 비하여 1.6 dS $m^{-1}$에서는 품종에 따라 3-4일이 지연되었고, 3.2 dS $m^{-1}$에서는 6-10일이, 4.8 dS $m^{-1}$에서는 7-13일이 지연되었다. 2. 토양염농도에 따른 경수는 숙전토양에 비해 1.6 dS $m^{-1}$에서는 품종에 따라 각각 14%-58%가 감소되었으며, 이후 토양염농도가 높아질수록 감소가 심했다. 초장은 주당 경수가 적었을 때 커지는 경향으로 염농도보다 경수의 영향을 더 크게 받았다. 3. 괴경 수량은 대조구 대비 1.6 dS $m^{-1}$일때 33.7%, 3.2 dS $m^{-1}$일때 59.5%, 4.8 dS $m^{-1}$에서는 79.3% 가 감소되었다. 4. 회귀곡선을 이용하여 수량의 감소가 시작되는 염농도를 분석한 결과 추동은 1.2 dS $m^{-1}$, 추백은 1.8 dS $m^{-1}$, 추강과 추영은 1.9 dS $m^{-1}$, 그리고 수미는 2.0 dS $m^{-1}$ 이었고, 수량의 50%가 감소되는 염농도는 추백은 2.4 dS $m^{-1}$, 추동 2.45 dS $m^{-1}$, 추강 2.81 dS $m^{-1}$, 추영 3.03 dS $m^{-1}$, 수미는 3.29 dS $m^{-1}$였다. 이상의 결과를 종합하였을 때 간척지 재배에 적당한 감자품종은 수미로 판단된다.