Soluble salts are dominant form at reclaimed tidal saline soil, which can be improved by leaching with excessive irrigation water. The objective of this study was to evaluate the effect of irrigation on soil salinity and corn (Zea mays) growth at reclaimed tidal saline soil. A field experiment was conducted at Saemangeum reclaimed tidal land in Korea, during two successive growing seasons between 2013 and 2014. During the growing season, three different irrigation practices were applied as following; (1) irrigation at −35 kPa, (2) irrigation at −50 kPa, and (3) no-irrigation. Soil salinity was significantly decreased with increasing irrigation rates. Soluble cations were statistically decreased with irrigation; especially the depression of soluble Na was greater than other cations. Corn growth was significant with irrigation practice and the length of stem, panicle number, and stem thickness was statistically greater compared to the control. Although the germination rate was more than 95% in all treatment, withering rate was great in both growing seasons, which was significantly decreased with irrigation practice. Our results indicated that salt control is critical at reclaimed tidal saline soil and irrigation practice based on soil potential could be one of the best management options to alleviate salt damages for stable crop production at reclaimed tidal saline soil.

Irrigation with saline water of rivers and groundwater reservoir into paddy field cause decreases rice production depending on water salinity. The purpose of this research was to determine the critical concentration of water salinity for provision of a basic information on the stable rice production in west costal area of Honam region. A greenhouse experiment was conducted at the 13 levels of saline water [0.01(control) 0.03, 0.05, 0.08, 0.10, 0.13, 0.15, 0.20, 0.25, 0.30, 0.50, 0.70, 1.00%] in transplanted rice using c.v. Cheongho and tolerance to different water salinities was evaluated at three growth stages of the rice plant such as [(35 DAT:Tillering), (81 DAT:Heading), and (106 DAT:Ripening)], respectively. Increasing water salinity significantly decreased grain yield and the higher in salinity the severe effect on yield reduction. The growth responses to water salinity varied at different growth stages of rice. At 35 DAT, increased water salinity decreased plant height and number of tillers significantly. Higher water salinity delayed the days to heading by 2 days (0.05%), 4 days (0.08%) and 7 days (0.1%). The critical water salinity at 35 DAT was below 0.08%. At 81 DAT, Cheongho survived at 0.10 and 0.08% salinity, respectively. However, at water salinity levels above 0.10%, the yield components such as number of panicles and number of spikelet decreased drastically. Thus, it was suggested that the critical water salinity at the mid-stage (tillering~heading, 81 DAT) was 0.05%, At 106 DAT, based on yield index that gives above 50% grain yield, the 0.05% salinity showed the lowest 61.1% grain yield of 19.2 g/plant as compared with the highest grain yield of 31.4 g/plant at 0.01% (control).

Soil salinity at newly reclaimed land in west coast of Korea is highly variable and depending on soil characteristics and weather conditions. The objective of this study was to evaluate the spatiotemporal distribution characteristics changes on soil electrical conductivity and exchangeable sodium percentage in Saemangeum newly reclaimed land. Experimental sites was selected at Gyehwa (35o75'N, 126o60'E) in Saemangeum reclaimed land and their dominant soil series was Munpo (coarseloamy, mixed, non-acid, mesic, typic Fluvaquents). Soil samples were periodically collected at 0 ~ 20 cm and 20 ~ 40 cm layer from each site. Soil electrical conductivity had a wide range from 0.15 to 41.76 dS/m, which was variable according to the weather conditions. The average soil electrical conductivity from March 2014 to 2015 was 6.4 and 3.4 dS/m at Gyehwa in Seamangeum reclaimed land. Calcium concentration in soil solution was negatively correlated with soil electrical conductivity and soluble sodium. Soluble sodium concentration had great variations and it was the most influencing single factor for temporal variations of soil electrical conductivity regardless of soil textural properties. The characteristics of Saemangeum reclaimed land had different shares of saline and sodic properties during the experimental period. Our results indicate that persistent monitoring and modeling on soil salinity at coastal tide land is fundamental and the results can provide some useful information for deciding management plans for diverse utilization or to reduce salt damage for stable crop production at reclaimed tidal land.

본 연구는 새만금 간척지에서 비닐하우스 작물 재배 가능성 검토를 위해 녹색꽃양배추를 대상으로 일일 관수량을 달리하여 관수량에 따른 토양 염농도 및 생육특성 등을 조사하여 관수량에 의한 재염화 억제효과를 알아보고자 수행하였다. 수확기의 표토의 평균 토양 EC 는 1.5 및 3.0mm·day-1 처리구에서 각각 10.9 및 11.5dS·m-1 였으며 6.0mm·day-1 처리구에서 5.1dS·m-1로 1.5 및 3.0mm·day-1 처리구보다 52~56% 낮게 나타나 점적관수 량에 따른 제염효과를 확인할 수 있었다. 화뢰의 무게는 6.0mm·day-1 처리구에서 주당 371.3g으로 1.5 및 3.0mm·day-1 처리구의 60.9g 및 129.1g보다 높은 값을 나타냈다. 50%의 수량감소를 보이는 토양 EC는 7.6dS·m-1였으며 점적관수에 의한 토양 제염효과는 6.0mm·day-1 처리에서 30~40cm 깊이까지 나타났다. 따라서 새만금간척지에서 녹색꽃양배추 재배시 점적관수에 의한 토양 재염화 억제를 위해서는 6.0mm·day-1 수준의 관수량으로 총 422mm의 물량이 필요할 것으로 예측된다. 그러나 염류의 이동은 토양 이화학적 특성 및 계절적 요인 등 여러 가지 환경요인에 영향을 받으므로 간척지 비닐하우스에서 점적관수에 따른 염류의 이동특성에 관한 추가적인 연구가 필요할 것으로 판단된다.

본 연구에서는 염 농도에 따른 된장의 발효과정 중에microflora와 향미의 변화를 분석하였다. 염 농도가 4.8%,8.4%인 저염 된장의 총균수와 균총의 패턴은 염 농도가12.0%, 15.6%, 19.2%인 고염 된장과 유사하게 나타났다.호기성균과 호염성균의 경우에는 모든 염도와 전 발효 기간에 7-11log CFU/g의 높은 수준에 수치를 보였다. 호기성 세균과 호염성 세균의 균총을 보았을 때, 저염 된장의 발효초기에는 Bacillus licheniformis와 Bacillus amyloliquefaciens가 많은 비중을 차지하였다. 주요 향기성분들을 중심으로 각시료들의 향미성분에 경향성을 보기 위해 SPME를 이용하여 발효 기간 중 변화량 값을 GC-MS 통해 비교 분석한결과, dehydes, alcohols, acids의 경우 발효 초기부터 발효3개월까지 저염화 시료에서 많이 생성되었으며 발효가 지속적으로 진행됨에 따라 시료들 간의 격차는 점차 감소하였다. 발효 6개월 부터 저염 시료에서도 다양한 pyrazine이 형성되었다.

본 연구에서는 염 농도에 따른 간장의 발효과정 중에 microflora와 향미의 변화를 분석하였다. 전체적으로 4.8%와 8.4%, 12.0%, 15.6% 시료의 호기성균과 호염성균 생균수에 대해서는 큰 증감 없이 유사한 경향으로 나타났다. 발효초기에는 Bacillus amyloliquefaciens, B. licheniformis, B. subtilis가 주를 이루었다. 유산균이나 곰팡이의 미생물총균수 패턴은 모든 염도 별로 거의 유사하게 낮게 나타났으며, 발효 초기에만 발견되었다. 효모 또한 4.8% 간장에서만 2 log CFU/g 이하의 낮은 수치를 보였다. Aldehydes, alcohols, acids의 경우 발효초기부터 발효 3개월까지 저염화 시료에서 많이 생성되었다

본 연구는 염생식물인 퉁퉁마디를 대상으로 하여 신간척지에서 안정적인 재배법을 구명하고자 수행하였다. 먼저 퉁퉁마디의 발아특성을 알아보기 위해 염농도(NaCl 0 ~ 3% 농도) 별발아율 시험을 수행하였다. 10oC에서는 모든 염농도에서 발아속도는 느리나 15일까지 발아가 지속되어, 78 ~ 90%의 발아율을 나타내었다. 20oC이상에서는 4일 안에 최대의 발아율을 나타내었으며, NaCl 3%에서 온도가 올라갈수록 발아율이 저하되는 경향을 보였다. 퉁퉁마디의 질소시비량 별 생육특성을 알아보기 위해 온실포트실험을 실시한 결과, 퉁퉁마디 파종 후 5일 후부터 발아가 시작하였고, 퉁퉁마디의 생육은 질소시비량이 증가할수록초장 및 분지 등이 증가하는 경향을 나타내었다. 또한 염농도에 따른 생육특성을 조사하기 위해 양액 재배 조건에서 염농도에 따른 퉁퉁마디 생육을 실험하였다. 양액조건 상태에서NaCl을 처리하지 않으면 생육이 저조하여 1개월 이후에 고사하기 시작했으며, NaCl을 처리한 구에서는 NaCl 200 mM에서생육이 좋았고, NaCl 500 mM 이상의 염농도에서도 재배가 가능할 것이라 생각된다. 신간척지에서 퉁퉁마디의 어린 싹을6월에 이식하여 질소시비량이 퉁퉁마디 생육에 미치는 영향을조사하였다. 퉁퉁마디의 초장 및 분지수 등이 질소시비량이 증가할수록 유의적으로 증가하였으나, 인산을 비롯한 무기성분함량은 유의적인 차이가 없었다.

새만금 간척지에서 동계 사료작물의 재배 가능성을 검토하기 위하여 2009년 가을부터 2011년 봄까지 염분농도가 다양한 토양조건에서 청보리, 호밀, 밀, 트리티케일, 귀리 등을 공시하여 생육특성,생초 및 건물수량 등을 검토한 결과를 요약하면 다음과 같다. 1. 출현율과 입모율은 토양에 염분이 거의 없는 시험구에서 84%와 79%인 반면, 토양 염농도 0.2% 시험구에서는 73%와 64%, 토양 염농도 0.3% 시험구에서는 52%와 40%, 토양 염농도 0.4% 시험구에서는 37%와 22%이었다. 2. 사료작물별 출현율과 입모율은 호밀, 밀, 트리티케일 및 청보리는 비슷하였으며, 귀리는 상대적으로 낮았다. 3. 초장은 토양 염농도가 높을수록 현저히 단축되었으며, 토양 염농도 0.3% 이상 시험구에서는 단축정도가 매우 컸다. 4. 생초 및 건물수량은 토양에 염농도가 거의 없는 시험구 대비 토양 염농도 0.2% 시험구에서 66~77% 수준이었으나, 토양염농도 0.3% 이상 시험구에서는 30~61% 수준이었다. 5. 사료작물별 생초수량은 호밀 >밀 >청보리 >트리티케일 >귀리 순으로 많았으며, 건물수량은 밀> 호밀=청보리> 트리티케일> 귀리 순으로 많았다. 6. 따라서 새만금 간척지에서 동계 사료작물의 재배가 가능한 토양 염농도는 공시작물의 생육특성, 생초 및 건물수량 등을 종합해 볼 때 0.2% 이하이고, 염류토양에 대한 적응력이 높은사료작물은 호밀, 밀, 청보리, 트리티케일 이었다.

Common reed (Phragmites australis) is widespread in reclaimed land and wetland habitats. Every year, the common reed produces extensive colonies by means of underground rhizomes and ground-surface stolons. From an agricultural point of view, the common reed's large biomass is a good material for supplying organic matter. However, it has not yet been studied in terms of seedling production, transplanting conditions, and decomposition characteristics in reclaimed land. Seeds were harvested from the native common reed in Saemangeum, South Korea, the previous year and stored on an open field. The seeds were sowed in the greenhouse at the beginning of April. Common reed decomposition was studied from June to September, with the use of coarse mesh (5 mm) stem litterbags, on three samping dates and with five replicate packs per sample. These packs were dug in five soil condition (low-salinity topsoil, subsoil, high-salinity topsoil, subsoil, paddy topsoil) to 0.2 m and 0.4 m depth. The highest germination rate of common reed seeds was observed in non-salt solution, but the exhibited germination rate was 70% at 9.38 dS m-1. The plant height of young reed decreased steadily with increasing salinity, but leaf number did not decrease by 9.38 dS m-1. The survival rate of the two-year-old reed was 83.3%, which was 35% higher than that of the one-year reed. The transplant success rate was 0% in the no vinyl mulching in the soil, but the first year and second year seedlings survived rates were 63% and 83.3%, respectively, in vinyl mulching. Common reed decomposition rates were faster low salinity than high salinity. All nutrient contents were found to fluctuate significantly with time by soil conditions. We also need to study the growth rate of reed transplanting seedlings by soil moisture contents and the comparison of degradation in common reed tissues.

Background : Licorice (Glycyrrhiza uralensis F.) is one of the most widely used raw materials for food and pharmaceuticals, and is currently the No. 1 imported medicinal plant in Korea. Efforts to settle licorice cultivation in Korea have been carried out for hundreds of years but have not succeeded, and many people suspect that the reason is due to the inadequate cultivation environment. However, even until recently, most licorice has been procured by wild harvesting, so studies on licorice cultivation technique and cultivation environment have not been conducted much in the world. This experiment was conducted to investigate the germination characteristics of licorice by temperature and salt concentration in order to find the optimal cultivation environment conditions of licorice. Methods and Results : The germination rate of licorice seeds was high 77.5 - 90.5% at 10 - 3 6℃, but it started to drop from 66.5 - 68.0% at 38 - 40℃ and it decreased sharply from 9.0 - 15.0% at 42 - 46℃. No longer germinated at temperatures above 48℃. The average number of days of germination was 12.3 days at 10℃, 5.7 days at 20℃, 3.5 days at 30℃ and 4.1 days at 40℃. The germination start date was 2 to 4 days in the 18℃ - 46℃ range. The average germination rate was the highest at 32℃. The germination time of 40% was 2 - 4 days at 18 - 46℃. The germination of more than 80% took 3 - 5 days at 20 - 40℃, 6 - 8 days at 14 - 1 8℃ and 10 days at 10 - 12℃. Licorice was able to germinate even in the presence of salt. Seed germination rate was 78.5 - 85.5% at 0 - 1% salt concentration and 63% at 1.5% and 18% at 2.0%. In addition, 8.5% seeds germinated successfully even at 3.0% salt concentration. Conclusion : Licorice has been known as a low temperature crop, but germination was possible in a wide range of temperature and salt concentration. Especially, the germination characteristic was higher in the high temperature range of 30 - 36℃, which corresponds to the domestic summer temperature. Therefore, the results of this study are expected to be useful reference for exploring suitable cultivation area in Korea.

This experiment was conducted to establish a cultivation system for sorghum in reclaimed soils. Pot experiments were used to test the effects on seedling establishment of sowing depth, soil water content, and soil salinity using seeds of Nampungchal-susu and Hwanggeumchal-susu in reclaimed soil. Field experiments were also conducted to examine differences in growth characteristics and yield production, by sowing time, and planting distance. The result of the pot experiment, examining seedling establishment at various sowing depths revealed that, it was the highest 76.7% when the seeds were sown at a depth of 3 cm. Seedling establishment did not differ with soil water content between 10~30 kpa and at 51~70 kpa. No effects of seed moisture absorption before sowing were observed. Seedling establishment showed no differences with soil salinity below 3.2 dS m-1, but decreased with Salinity above 4.8 dS m-1. In field experiments to assess the effects on seedling establishment ratio of sowing time, Nampungchal-susu was revealed to have a high seedling establishment ratio following sowing on June 15. Hwanggeumchal-susu did not exhibits effects of sowing time, on seedling establishment ratio but exhibited higher seedling establishment when in low soil salinity conditions than when sown in high soil salinity conditions. With respect to yield, the yield of the seeds sown on June 15 was higher by 13% for Nampungchal-susu and by 29% for the Hwanggeumchal-susu than that those sown on June 25. With respect to soil salinity, the yield at a soil salinity of 3.2 dS m-1 was lower by 23% than that at 1.6 dS m-1 or lower for Nampungchal-susu, and was lower by 30% Hwanggeumchal-susu. With respect to planting density, both breeds showed the highest yield at 60×10 cm. These results suggest that a sowing time of June 15 and a seeding distance of 60×10 cm are appropriate for sorghum in reclaimed land.

Limonium tetragonum is a halophyte grown naturally in the coastal region in South Korea. This study was conducted to investigate the effects of salt concentrations on seed germination, seedling growth, and antioxidant capacity of L. tetragonum. Seeds were collected from naturally grown plants of L. tetragonum and those at full maturity were used in this experiment. All experiments were performed at 0%, 0.5%, 1.0%, or 2.0% of salt concentrations. Seed germination rate was highest as 86% at 20℃ and followed as higher in order of 25℃, 30℃ and 15℃. The germination rate was about 80% at 0% or 0.5% of salt concentration, but it was very low at the salt concentrations higher than 1%. Growth of L. tetragonum seedlings showed no difference in Hoagland solution containing NaCl in the range of 0% to 1.0% and seedlings survived at 2.0% of NaCl concentration. As the salt concentration increased, the content of Na+ in the shoot increased, but that of K+, Ca++, or Mg++ decreased. The antioxidant activity and the content of total polyphenol and total flavonoid in the shoot were similar at 0% and 0.5% of NaCl and were highest at 2.0% of NaCl concentration. In conclusion, performance of seed germination and plant growth of L. tetragonum was highest at 0% and 0.5% of NaCl concentration, and showed no difference in antioxidant activity, total polyphenol contents, and total flavonoid contents at the same salt concentrations.

This experiment was conducted to identify the variations in inorganic nutrients and plant growth in millet (Panicum miliaceum L.) due to soil salinity. The soil series was Munpo and soil texture was silt loam. The experimental soil was amended so that the soil had salinities of 0.8 dS m-1, 1.6 dS m-1, 3.2 dS m-1 and 4.8 dS m-1. Millet was transplanted 15 days after sowing. As soil salinity increased, the degree of reduced growth was in the order of seed production > root dry matter > plant dry matter > culm length > tiller number > stem thickness > Panicle length. Seed production was decreased to 18.9% in soil salinity of 1.6 dS m-1, 36.9% in of 3.2 dS m-1, and 50.7% in EC of 4.8 dS m-1. Root dry matter decreased to 35.8% in EC of 3.2 dS m-1, and to 40.5% in EC of 4.8 dS m-1. As soil salinity increased, Total nitrogen content increased in all aboveground parts, roots and seeds. However, There was no difference in CaO, P2O5, K2O and, MgO in soils of different salinity. On the other hand, Na2O content was higher in the order roots> shoots> seed, and in the case of roots, Na2O content increased to 1.02% in soil salinity of 4.8 dS m-1. However, up to soil salinity of 1.6 dS m-1, the Na2O content of the seed was similar to that in plant grown in the Control conditions(0.8 dS m-1). In conclusion, taking into consideration economic factors, millet could be cultivated in soil with salinities of up to approximately 1.6 dS m-1, and seed produced from reclaimedland would be suitable for human consumption.

간척지에서 재배될 수 있는 염생식물은 국토의 효율적 이용과 식량의 안정적인 확보 측면에서 매우 중요한 유전자원이다. 본 연구에서는 염생식물인 퉁퉁마디의 작물로서의 이용을 위하여 종자의 발아특성과 염농도에 따른 생육특성을 규명하고자 하였다. 퉁퉁마디 종자는 화피로 둘러싸여 있는 난형으로 연한 갈색을 띄었으며, 수분흡수 후 종피가 파열되면서 유근이 출현하여 발아가 시작되었다. 퉁퉁마디 종자의 발아에서 화피의 영향을 알아보기 위하여 최적 발아온도로 알려진 25℃와 30℃에서 raw seed와 화피제거 종자의 발아율을 조사하였다. Raw seed는 25℃에서 5%, 30℃에서 7%의 발아율을 보인 반면, 화피 제거 종자는 25℃에서 53%, 30℃에서 58%의 발아율을 보여 화피 제거에 의하여 종자의 발아율이 급격히 상승하였다. 따라서 종자의 발아율을 높이기 위하여 500㎛ sieve를 이용하여 화피를 제거할 수 있는 기계적 방법을 개발하였으며 이 방법에 의하여 화피가 제거된 종자를 90% 이상 확보할 수 있었다. 화피 제거 종자의 염농도에 따른 종자의 발아율을 조사한 결과, 0mM에서 53%, 50mM에서 49%, 100mM에서 35% 그리고 200mM에서는 26%로 염농도가 낮을수록 발아율이 높은 것으로 나타났다. 한편, 유묘의 염농도에 따른 생장량 조사를 위하여, 2주된 유묘를 상토에 이식하고 0~200mM의 염처리를 하여 5주간 초장과 분지수를 조사한 결과, 퉁퉁마디의 생장량은 100mM에서 가장 많았다. 따라서 퉁퉁마디의 유묘확보율을 높이기 위해서는 종자의 화피를 제거하여 염농도 0mM인 25~30℃에서 발아를 시키고, 유묘생장단계에서는 100mM 전후의 염농도가 최적조건으로 판단되었다.

새만금 간척지를 포함하여 우리나라는 넓은 간척지를 보유하고 있으나 제염되지 않은 간척지에서 재배할 수 있는 농작물은 매우 한정적이다. 따라서 높은 염농도에서도 재배 가능한 염생식물인 나문재의 작물로서의 이용을 위하여 본 연구에서는 나문재의 종자구조와 염농도에 따른 유묘생육 특성을 조사하였다. 나문재는 쌍떡잎 식물로서 종자 내에 배유층이 존재하지 않으며, 종자를 화피가 감싸고 있고 결실기에 화피가 바깥쪽으로 신장되어 오각형의 별모양의 형태를 보였다. 종자 크기는 길이가 0.44±0.10cm, 너비가 0.47±0.09cm, 폭이 0.31±0.06cm이었으며 천립중은 1.58±0.07g이었다. 화피를 제거하면 길이 0.31±0.05cm, 너비 0.31±0.06cm, 폭은 0.12±0.04cm였으며 천립중은 0.74±0.06g이었다. 종피가 감싸고 있는 종자의 내부는 shoot apex를 중심으로 배축이 나선형으로 두 번 반정 감겨져서 종자 바깥쪽으로 radicle이 향하고 있는 구조를 가지고 있다. 종자 침종 후 발아하는 데는 30℃에서 평균 3일 정도가 소요되었으며, 발아 시 radicle이 종피를 뚫고 신장하였으며, 이 때 나선형의 배축이 풀리고 황색의 떡잎은 짙은 초록색으로 변하면서 갈라져 신장하였다. 염조건에 따른 유묘의 생장 특성을 조사하기 위하여 초장 10cm 내외의 유묘를 상토에 이식하고 염농도를 0, 20, 50, 100, 200mM로 처리하고 5주 간 생육조사를 실시하였다. 그 결과, 나문재의 초기 생장량은 염농도 50mM에서 초장이 55.95±6.30cm, 분지가 56개로 가장 많았으며, 100mM에서는 50mM의 생장량보다 약간 적었으나 유의한 차이를 보이지는 않았다. 반면, 생육이 가장 부진하였던 200mM에서는 50mM에 비하여 초장은 19.05cm, 분지는 13개 감소하였다. 이와 같은 결과로 볼 때, 나문재는 적정 생육 염농도는 50~100mM 정도로 판단되었다.

우수한 사료자원으로 평가되는 케나프의 생산단가를 낮 추기 위하여 새만금 간척지 시험포에서 염농도 단계별 생육 및 수량을 관찰한 결과 케나프는 중·상정도의 내염성을 보 유한 작물로 평가할 수 있으며 충분한 제염이 이루어진다고 하면 간척지에서의 재배 가능성도 충분할 것으로 평가할 수 있었다. 염농도별 케나프의 발아력을 조사한 결과 토양 염 농도가 4.0 dS/m (=0.26%) 일 때 84%이던 케나프 발아율 이 5.0 dS/m (=0.32%) 에서는 18%로 급격히 떨어졌으며 6.0 dS/m (=0.39%) 에서는 발아율이 10%를 넘지 못하였다. 또한 생육 상황도 토양 염농도에 비례하여 급격히 떨어졌는 데 케나프는 줄기직경을 2.6 cm 이상으로 유지할 수 있을 경우 엽수가 유의할 수준으로 늘어나고 줄기부분에 대한 상 대적 무게비율이 증가하는 결과를 얻을 수 있었다. 이는 잎 의 분열을 촉진시킬 수 있는 충분한 생장량 확보가 줄기직 경 2.6 cm 이상에서부터 가능하다는 것을 의미하는데 새만 금에서는 토양 염농도 4.0 dS/m (=0.26%) 이하에서는 케나 프의 줄기직경을 2.6 cm 이상으로 유지하는 것이 가능하였 으나 염농도가 5.0 dS/m (=0.32%)를 넘어서게 되면 줄기직 경이 2.0 cm 이하로 엽수도 20~46% 감소하였다. 생육장해는 파종 후 1개월 경과부터 본격적으로 나타나기 시작하였 는데 엽 정단이 고사하고 주변 잎 들이 급격하게 황화 낙엽 되는 현상이 발생하였다. 케나프의 토양 염농도에 대한 수 량성을 분석한 결과 토양 염농도 4.0 dS/m (=0.26%) 까지 는 비간척지에 비해 수량이 최대 19% 하락하였으나 염농도간 차이는 크지 않았다. 그러나 토양 염농도가 4.0 dS/m (=0.26%) 를 넘어서는 5.0 dS/m (=0.32%) 에서는 비간척지의 51% 수준을 유지하는데 그쳤으며 토양 염농도 4.0 dS/m (=0.26%) 일 때의 수량에 비해서도 38% 감소하였다. 통계분석을 통 하여 간척지에서 수량성 감소를 80% 이내로 유지 할 수 있 는 토양 염농도를 산출해본 결과 토양 염농도가 4.2 dS/m 이내로 유지될 경우 케나프의 생산성은 80% 이상을 유지할 수 있었다.

This study conducted experiments on the reclaimed land of Saemangeum located in Jeongrabuk-do in order to gain basic information about growth characteristics and yield ability according to soil salinity. Having soil excluding salt as a control group, this study adjusted the specimens’ soil salinity to level 4 and then planted four varieties including Ilmichal Corn to investigate the growth or grain yield according to salinity. About the corn establishment rate according to soil salinity, over 97% up to 3.2 dS m-1 was established, and then, it was reduced gradually according to the increase of concentration. According to the salt concentration of soil more required growth duration from seeding to heading comparing to non-treatment salt was delayed, at 1.6 dS m-1, two days were delayed, at 3.2 dS m-1, four to six days were delayed differently by varieties, and at 4.8 dS m-1, six to 10 days were delayed. About the plant fresh weight according to soil salinity, Chalok 4 and Eolrukchal indicated 93%~97% or so compared with the salt-free one at 1.6 dS m-1, and Chalok No. 4 showed 79% at the salinity of 3.2 dS m-1, too, and it was a relatively higher growth percentage than those of the other varieties. In terms of dried seed weight according to soil salinity, compared with the corns cultivated in the control group, averagely 12.1% was lowered at the time of cultivation at 1.6 dS m-1, and 3.2 dS m-1 40% was lowered, and about 70% was lowered at 4.8 dS m-1. According to the result of examining the point of time that dried seed start to reduce due to soil salinity with the regression equation, soil salinity which starts the reduction of grain weight is 1.67 dS m-1~2.18 dS m-1, and it differs by varieties, and EC of 50% that the yield reduces in half is 2.96 dS m-1 ~4.45 dS m-1. And the degree of influence on each of the growth factors according to soil salinity is founded to be in the order of establishment rate<plant length=the ear’s fresh weight<the plant fresh weight<yield.