CNU Journal of Agricultural Science 38(4), 2011. 12 631 신규 채소작물용 번행초의 토성 및 염도에 대한 생육 반응 김성기 1 ㆍ김인경 2 ㆍ이긍주 2 * 1 목포대학교 원예과학과, 2 충남대학교 원예학과 Growth responses of New Zealand Spinach [ Tetragonia tetragonoides (Pall.) Kuntze] to different soil texture and salinity Sung-Ki Kim 1 , In-Kyung Kim 2 , Geung-Joo Lee 2 * 1 Dept. of Horticultural Science, Mokpo National University, Mooan, 534-729, Korea 2 Dept. of Horticulture, Chungnam National University, Daejeon, 305-764, Korea Received on 21 November 2011, revised on 2 December 2011, accepted on 18 February 2011 Abstract : This research was conducted to investigate potential use of New Zealand spinach (Tetragonia tetragonoides) as a new vegetable crop which will be cultivating in salt-affected soils including reclaimed land. Traditionally New Zealand spinach has been studied to explore functional compound or salt removing potential. To cultivate the crop species in the salt-affected soil widely, it is essential to obtain salt and soil texture responses under the controlled environment. Fifty nine New Zealand spinach ecotypes native to Korean peninsula first collected over seashore areas, and primitive habitat soil environment was evaluated by analyzing soil chemical properties from 32 locations. Different textures of sandy, silt loam, and sandy loam soils were prepared from nearby sources of sea shore, upland and paddy soils, respectively. Target salinity levels of 16.0 dS/m, 27.5 dS/m, 39.9 dS/m, and 52.4 dS/m in electrical conductivity (ECw) were achieved by diluting of 25, 50, 75, 100% (v/v) sea water to tap water (control, 0.6 dS/m), respectively. Various measurements responding to soil texture and irrigation salinity included plant height, root length, fresh weight (FW), dry weight (DW), leaf parameters (leaf number, leaf length, leaf width), lateral branching, and inorganic ion content. was found to adapt to diverse habitats ranging various soil chemical properties including soil pH, organic matter, exchangeable bases, EC, and cation exchange capacity (CEC) in Korea. Responding to soil texture, New Zealand spinach grew better in silt loam and sandy loam soil than in sandy soil. Higher yield (FW and DW) seemed to be associated with branch number (r=0.99 and 0.99, respectively), followed by plant height (r=0.94 and 0.97, respectively) and leaf number (r=0.89 and 0.84, respectively). Plant height, FW, and DW of the New Zealand spinach accessions were decreased with increasing irrigation salinity, while root length was not significantly different compared to control. Based on previous report, more narrow spectrum of salinity range (up to 16 dS/m) needs to be further studied in order to obtain more accurate salinity responses of the plant. As expected, leaf Na content was increased significantly with increasing salinity, while K and Ca contents decreased. Growth responses to soil texture and irrigation salinity implied the potential use of New Zealand spinach as a leafy vegetable in salt-affected soil constructed with silt loam or sandy loam soils. Key words : Halophyte, Leafy vegetable, New Zealand spinach, Salinity, Soil texture *Corresponding author: Tel: +82-42-821-5734 E-mail address: gjlee@cnu.ac.kr I. 서 론 우리나라의 국토는 평야지보다 산지가 많아 활용할 수 있는 가용 토지가 적고, 쌀을 비롯한 식량을 생산 할 수 있는 우량농경지는 산업화, 도시화에 따른 타 용도 전용 등으로 1991년 이후 매년 18,000 ha씩 급속히 감소되고 있는 추세이다. 이에 대한 대책의 하나로 지금까지 우리 나라는 서남해안 간척자원을 대상으로 간척사업을 진행 하여 왔다. 간척지 사업은 한정된 국토에서 도시화와 산 업화로 인해 잠식되는 농경지 및 산업단지를 대체 확보함 으로써 식량의 안정적 공급 등 긍정적인 효과를 가져왔다 (Lee 등, 2003; Lee 등, 2006). 그러나 간척지 개발 초기 CNU Journal of Agricultural Science Vol. 38, No. 4, pp. 631-639, December 2011