본 연구는 식물공장에서 아쿠아포닉스와 수경재배에서 재배된 딸기의 무기양분 흡수율, 생육, 수량을 비 교하고자 수행되었다. 양어는 비단잉어(Cyprinus carpio) 12마리를 수조(W 0.7m × L 1.5m × H 0.45m, 472.5L)에 367.5L 물을 채운 후 입식하였고 5.44kg·m-3 밀도로 사육하였다. 딸기 모종 30개체는 펄라이트를 채운 포트에 정식 하여 아쿠아포닉스 시스템 베드(W 0.7m × L 1.5m × H 0.22m)에 장착하였고, 모종 30개체는 네트포트에 정식한 후 담액수경(DFT)시스템 베드(W 0.7m × L 1.5m × H 0.22m)의 아크릴판(140 cm × 60 cm, Ø80 mm)에 장착하였다. 재 배기간 동안 아쿠아포닉스 수조액의 pH와 EC는 각각 4.3－6.9, 0.32－1.14dS·m-1 수준이었고, 수경재배는 각각 5.1 －7.5, 1.0－1.8dS·m-1이었다. 아쿠아포닉스 수조액의 NO3-N와 NH4-N 농도는 수경재배보다 각각 약 3.6, 2.2 me·L-1 높았다. P, Ca, Mg, S 농도는 수경재배보다 각각 약 0.76, 3.1, 0.8, 0.9me·L-1 높았으며, K와 Fe는 각각 약 0.8me·L-1, 0.5mg·L-1 낮았다. 딸기 잎의 무기이온 함량은 두 재배 처리 간 유의차가 없었으며 엽내 K 함량은 적정 범위를 보였 다. 정식 후 58과 98일 사이에 아쿠아포닉스에서 재배된 딸기의 T-N와 P 흡수율은 수경재배보다 각각 1.5, 1.9배 높 았고 K 흡수율은 유의차가 없었다. 개체당 과실수는 아쿠아포닉스에서 수경재배보다 유의하게 많았으며, 상품과 생체중, 건물중, 과실의 과장과 과폭은 수경재배에서 아쿠아포닉스보다 높았다. 결과를 종합하면, 아쿠아포닉스에 서는 수조액의 물고기 배설물과 먹이 잔여물에 의한 고체 입자의 비료성분을 지속적으로 가용하여 활용한다는 것 을 알 수 있다.

본 연구는 딸기의 삽목 육묘 시 묘소질을 향상시키고 품질을 증진시키기 위한 지베렐린 효과를 검증하기 위해 수행되었다. 품종은 ‘설향’을 대상으로 하였고, 삽목 시 삽수의 기부를 30, 60분간 GA3 50, 100, 150mg·L-1에 침지 처리하고 증류수 침 지를 대조구로 두었다. 정식 시 묘소질 조사 결과 엽수와 SPAD 값은 지베렐린 침지시간이 길수록 증가하였고, 초장, 엽병장, 엽장, 엽폭, 엽면적은 침지시간과 농도 간의 상호작용에 따라 유의하게 값이 변하였다. 관부직경은 같은 농도라 할지라도 침지시간에 따른 차이가 나타났으며 30분, 100mg·L-1 처리를 제외하고 모두 직경이 8.0mm 이상으로 우량한 묘가 생성되 었으며, T/R률은 30분, 50mg·L-1 처리에서 유의하게 작아 식 물체 활력이 가장 우수했다. 양자수율은 농도가 150mg·L-1일 때 저조하였고, 지베렐린 처리 농도가 높을수록 양자수율이 감소하는 경향을 나타냈다. NPQ는 대조구 대비 30분, 150mg·L-1 처리에서 유의하게 작아 묘 스트레스 감소에 효과 가 있었다. 항산화물 함량은 30분, 50mg·L-1 처리와 60분, 150mg·L-1 처리에서 높게 나타났고, 정식 후 생육조사 결과 화아분화 정도에 미치는 지베렐린의 부정적 영향은 없었다. 따라서, ‘설향’ 딸기의 삽목 육묘 시 지베렐린 처리는 정식묘 양성에 효과가 있는 것을 확인할 수 있었으며, 이때 대조구 대 비 생육 증진 및 품질 향상을 위해서는 삽수 기부를 50mg·L-1 의 지베렐린에 30분 침지처리하는 것이 보다 적정한 것으로 판단되었다.

스마트팜형 시설 딸기에 예찰 없이 작물 정식 초기에 천적을 먼저 적용하는 생태공학적 Natural Enemy in First (NEF) 기법이 총채벌레류 와 진딧물류의 밀도에 미치는 영향을 확인하였다. 대조구는 약제를 처리하여 비교하였다. NEF 처리구에서 총채벌레류와 진딧물류의 천적과 서식 처로 참멋애꽃노린재와 Portulaca sp.를 적용하여 작기 종료시점까지 해충의 밀도를 대조구와 유사하게 효과적으로 관리할 수 있었다.

This study was conducted to investigate the growth characteristics of domestic 'Sulhyang' strawberry (Fragaria × ananassa Duch.) seedlings and to analyze their relationships in order to develop a growth prediction model. Fresh weight, dry weight, and leaf area were measured to validate the newly developed growth model. The relative growth rate (RGR) of ‘Sulhyang’ seedlings’ dry weight was an average of 0.026 g·g-1·d-1, and it increased to 0.066 g·g-1·d-1 on the 49th day after transplanting (DAT). The relationship between DAT and RGR was represented as RGR (dry weight)(g·g- 1·d-1) = 0.0392/(1 + exp(–(DAT – 34.9940)/5.8662)). The crop growth rate (CGR) was an average of 0.060 g·m-2·d-1, and it increased to 0.211 g·m-2·d-1 on the 70th DAT. The relationship between DAT and CGR was calculated as CGR (dry weight)(g·m-2·d-1) = 0.1293/(1 + exp(–(DAT – 49.3917)/6.0928)). The relationship between shoot fresh weight (y) and shoot dry weight (x) per plant showed a linear relationship of y = 4.3189x + 0.7812 (R2 = 0.9976). Fresh weight, dry weight, and leaf area with respect to DAT and cumulative temperature increased exponentially, and sigmoid curve models were developed based on these data. The model with the highest coefficient of determination was found for the relationship between shoot dry weight (y) and cumulative temperature (x), represented as y = 14.2285/(1 + exp(–(x – 1590.1295)/377.8112)) (R2 = 0.9715). The results of this study can be utilized as valuable information for establishing a systematic management system for seedling production using strawberry cutting propagation methods. For the development of a more precise growth prediction model in the future, it is necessary to analyze and apply a wider range of growth indicators and meteorological factors related to strawberry seedlings.

This research was conducted to analyze the relationship between the induction time of runners and the growing degree days for domestic strawberry cultivars, 'Sulhyang' and 'Arihyang'. Runners were induced at 15-day intervals over five periods, starting from late April to early June, and the study compared the number of runner formations and temperature changes for each period while it also investigated the plantlet quality on the transplanting date. Based on back calculations from the transplanting date of September 18th, 'Sulhyang' required induction from late April to early May to achieve 70-day-old plantlets and from late April to mid-May for 60-day-old plantlets. On the other hand, 'Arihyang' needed induction from late April for 70-day-old plantlets and from late April to early May for 60-day-old plantlets. To secure about 20 daughter plants, the growing degree days needed to be around 1,000°C, and a delay in runner induction led to a delay in formation of daughter plants. The relationship between growing degree days and runner formation was expressed as the following quadratic equations: for 'Sulhyang,' y = 9E-06x2 + 0.0124x – 2.4806 (R2 = 0.9696), and for 'Arihyang,' y = 1E-06x2 + 0.0192x – 2.9274 (R2 = 0.9431), and these equations showed high correlations. The crown diameter on the transplanting date was thickest in mid-May for 'Sulhyang', and it tended to increase with delayed runner induction for 'Arihyang'. In conclusion, this study confirmed that the number of daughter plants and growth characteristics varied depending on strawberry cultivars and the timing of runner inducement time. The relationship equations derived through measurements of growing degree days can be used as the fundamental data for reasonable production of daughter plants in the future.

In this study, the effect of crown heating on the cultivation environment, budding, flowering and yields of strawberry was analyzed. In December, January, and February, when the outside temperature was low, the average strawberry crown temperature at daytime in the test zone was 1.3°C higher than that in the control zone, and the average strawberry crown temperature at nighttime in the test zone was 2.7°C higher than that in the control zone. The average bed temperature at daytime in test zone was 1.7°C higher than that in the control zone, and the average bed temperature at nighttime in test zone was 2.4°C higher than that in the control zone. As a result of performing correlation analysis and regression analysis on strawberry crown temperature and budding period, the correlation coefficient was -0.86, which tended to be shorter as the crown temperature was higher, and the determination coefficient was 0.74. The total yields of strawberry during test period were 392.6 g/plant for test greenhouse and 346.0 g/plant for control greenhouse respectively. As for the quality of strawberries, the ratio of 2L (very large) grades and L (large) grades was 62.4% in the test greenhouse and 58.5% in the control greenhouse, indicating that the proportion of high quality strawberries was higher in the test greenhouse.

This study aimed to develop an optimal greenhouse model for strawberry seedling during the summer high-temperature period based on the results of field surveys. We conducted a survey on the structure types of 46 strawberry seedling farms nationwide, including width, ridge height, eaves height, ventilation method, seedling bed width, and spacing. Based on the survey results, we derived the optimal greenhouse model by considering various factors. The greenhouse width was set at 14 meters to maximize the efficiency of seedling beds and overall space. The height was determined at 2 meters, taking into account ventilation during the summer season. To reduce stress on the supporting structure due to snow loads, we established a reinforcement installation angle of 50 degrees. We analyzed two different models that use support beams with dimensions of φ48.1×2.1t and φ59.9×3.2t, respectively, to ensure structural safety against meteorological disasters, considering regional design wind speeds and snow accumulation. We utilized these developed greenhouse model to conduct strawberry seedling experiments, resulting in a high survival rate of average 93.2%. These findings confirm the usefulness of the strawberry seedling greenhouse in improving the seedling environment and enhancing overall efficiency.

This study was conducted to investigate optimal conditions for cutting propagation of the strawberry cultivar “Sulhyang” through the collection methods of cuttings (runners tips), leaf number of cuttings, and cutting time. Cuttings were collected from the mother plant in the nursery bed (MP) and plants after fruit harvest (HP); the leaf number of cuttings was 0, 1, and 2, and the cutting time was at one-week intervals from June 4 to July 9. The survival rates for MP and HP cuttings were notably high, reaching 99.5% and 98.7%, respectively, but no significant difference was found. The number of roots were higher in MP cuttings, and there was no significant difference in crown and leaf growth. The fruit yields were 419.2 and 428.4 g, for MP and HP cuttings, respectively. The survival rates according to leaf number of cuttings were 98.1% and 98.3% for 1 and 2 remaining leaves, respectively, and remarkably lower at 25.3% for no remaining leaves. The root numbers were 26.0 and 26.3 for 1 and 2 remaining leaves, respectively, compared with 23.5 for no remaining leaves, with no significant differences in crown and leaf growth. The fruit yields were 424.4 and 421.5 g for 1 and 2 remaining leaves, respectively, and 396.7 g for no remaining leaves. The survival rates according to cutting time was over 97.2% in all cutting time without any difference in each treatment. The root, shoot, and crown of the nursery plant before planting showed the best growth in the cuttings on June 4 and 11, resulting in the highest fruit yields of 433.3 and 426.4 g, respectively, with the lowest yields at 384.5 g for cutting time on July 9. Both MP and HP materials proved suitable for strawberry cuttings. The optimal leaf number for cuttings was at least 1, and the optimal cutting time in Gyeongnam area was evaluated as around June 4-11.

This study was conducted to determine the optimal dipping time and concentration of gibberellin for improving the growth and quality of domestic cultivar 'Seolhyang' strawberry when using runner plants. Strawberry runner plants were collected on November 10th and soaked in GA3 concentrations of 50, 100, and 150 mg·L-1 for 30 and 60 minutes, respectively. After 75 days of planting, the growth results showed that in the 30-minute, 50 mg·L-1 treatment, the crown diameter was thicker and the T/R ratio was lower, indicating better plant vitality. Runner length increased with lower gibberellin concentrations, particularly promoting vegetative growth. Photosynthetic efficiency was more influenced by gibberellin concentration than dipping time, and using concentrations above a certain threshold acted as a stress factor for runner plants, leading to decreased photosynthetic efficiency. For enhancing seedling growth, soaking with 50 mg·L-1 of gibberellin for 30 minutes was found to be optimal. This study verified the effects of gibberellin treatment on strawberry runner plants to improve plant growth and quality, providing useful basic data for using gibberellin.

2022년 10월부터 2023년 5월까지 친환경 딸기재배 농가에서 점박이응애는 칠레이리애응애와 사막이리응애, 진딧물은 콜레마니진디벌을 대상으로 하는 천적처리구와 유기농자재를 사용하는 관행방제구에서 천적의 해 충 밀도억제 효과를 조사하였다. 천적처리구에서 점박이응애 성충 밀도는 잎당 1.5마리 이하, 알은 4개 이하로 관리되었고, 사막이리응애는 잎당 최대 0.4마리까지 증가하여 점박이응애 밀도억제에 많은 영향을 미친것으로 보인다. 반면, 관행방제구에서 점박이응애 밀도는 천적 방사구에 비하여 오히려 많은 발생량을 보였지만, 3월 9일부터는 사막이리응애의 증가와 유기농자재의 효과로 점박이응애 밀도는 급격하게 감소하였다. 진딧물 천적 처리구에서 진딧물 밀도는 1월부터 발생하였으며 3월 상순에 잎당 0.3마리까지 증가하였으나 이후 감소하였고, 콜레마니진디벌은 진딧물 발생이 많지 않아 3.9마리/㎡(2회) 방사하는 데 그쳤다. 한편, 관행방제구 포장의 진딧 물은 유기농자재의 영향으로 거의 발생하지 않았다.

Tetranychus kanzawai Kishida (Acari: Tetranychidae) is a major pest on strawberry, reducing both the quality and quantity of fruit production. We compared the virulence of an entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin ARP14 with a commercial GHA strain against T. kanzawai. In the laboratory, leaf dipping method was conducted while a one-time spray was carried out on selected planting units in strawberry greenhouse with each fungus strain and Triton X-100 as control. Adult T. kanzawai showed lower LT50 when treated with ARP14 strain compared to GHA in the laboratory. The densities of both adult and nymph mites in the greenhouse were significantly reduced in the treatment of two fungus strains compared to the control. The mycosis rate of T. kanzawai in greenhouse was 97.9% at 14 days when treated with ARP14 strain while it was 85.5% when treated with GHA strain. The results suggest that B. bassiana ARP14 can be an effective mycoinsecticide against T. kanzawai.

한국에서 시설 딸기 해충을 방제하는 대표적인 방법은 살충제를 사용한 화학적 방법이다. 이는 농가에서 쉽게 접하고 처리 시기를 마음대로 조절할 수 있는 장점이 있지만, 방제 비용과 농업인부의 빈번한 화학살충제 노출이 큰 단점이다. 경주시 상평농원은 천적을 적극적으로 사용하는 농가로써 2020년부터 현재까지 4년간 4종의 천적 을 구매, 사육, 방사를 실시하였다. 방사한 천적은 점박이응애 방제용 칠레이리응애와 사막이리응애, 작은뿌리 파리 방제용 뿌리이리응애, 진딧물 방제용 콜레마니진딧벌이며, 농장의 규모는 재배동 1,250평, 육묘동 450평으 로 자가육묘를 하기에 1년 내내 딸기를 재배하는 농장이다. 본격적으로 천적을 활용하는 시기는 9월부터 이듬해 5월까지 약 9개월이다. 이 기간 동안 소요된 비용은 천적을 구매하고 자가사육하여 사용한 경우(154만원), 천적과 약제를 구매하여 같이 사용한 경우(240만원), 천적만 구매하여 사용한 경우(262만원), 약제만 처리(377만원) 순 으로 나타났다. 다만, 이 결과는 과학적으로 반복 및 재현 검증되지는 않았고, 각 농가의 천적과 해충의 생태에 대한 이해도와 작물 재배능력, 천적 사육능력에 따라 차이가 있을 수 있다.

사막이리응애(Neoseiulus californicus)는 칠레이리응애에 비하여 고온건조한 조건에서 유리하고 점박이응 애, 차응애, 차먼지응애 등 응애류 뿐만 아니라 가루이, 총채벌레 등 다양한 미소해충을 포식 포식하는 광식성 천적으로서 전세계적으로 산업화되고 있다. 사막이리응애를 농가수준에서 증식하기 위하여 간단한 대량생산 방법을 개발하였다. 천적의 먹이원인 가는다리고기진드기와 배지로서 밀기울(70%) 및 팽창질석(30%)을 멸균 팩에 넣고 사막이리응애를 사육하였다. 그 결과 사막이리응애의 밀도는 3주차에 18배로 증식되었다. 증식된 사막이리응애를 딸기 농장에 2월초부터 4월초까지 8주간 매주 투여한 결과 잎당 점박이응애의 밀도는 무처리구 에서 41.5마리이고 천적처리구는 7.0마리로서 점박이응애 방제효과가 83%로 나타났다. 본 연구를 통하여 자가 생산한 사막이리응애를 활용하여 딸기농가의 점박이응애 방제에 효과적으로 사용할 수 있을 것으로 판단된다.

경북 안동의 진걸맘농장은 딸기와 쪽 농사를 주로 하고 있으며 10년 이상 친환경 무농약 농법을 인증받은 농가로서 천적을 활용하여 토경 1,000평 규모의 시설 하우스에 딸기 재배를 하고 있다. 2018-2020에 경북농민사관학교 친환경 천적과정을 통하여 천적의 자가생산 기술을 배우고 2021년부터 농가에서 직접 자가생산을 시작하였다. 그래서, 진걸맘농가는 칠레이리응애를 자가사육하여 지속적으로 딸기 재배지에 처리함으로서 점박이응애 방제에 성공한 농업인으로서 국내 첫 사례로 꼽힌다. 또한, 2022년 안동시농업기술센터에서 안전농산물 생산을 위한 천적 배양시 스템 보급 시범 사업에 선정되어 딸기 해충의 생물적 방제를 위한 뿌리이리응애, 칠레이리응애, 보리뱅커플랜트 등의 천적 배양시설 완공, 천적의 자가생산 및 성공적인 현장적용 기술로서 농산물의 지역특화, 브랜드화를 통한 농산물 가격 차별화에 크기 기여하였으며 국내 천적농업의 발전을 위해 앞장서고 있는 선도농가로 인정받고 있다.

This study was aimed to determine the effects of grow media on the mineral contents of the leaves and growth characteristics of strawberry grown under aquaponics system in a plant factory. For aquaculture, 12 fish (Cyprinus carpio) (total weight, 2.0 kg) were raised in an aquaponics tank (W 0.7 m × L 1.5 m × H 0.45 m, 472.5 L) filled with 367.5 L of water at a density of 5.44 kg·m-3 and total 34 of strawberry seedlings were transplanted in the pots filed with 200 g of orchid stone, hydroball or polyurethane sponge in the growing bed (W 0.7 m × L 1.5 m × H 0.22 m) laid out with holly acrylic sheet (140×60 mm, Ø80) on the top of the system. The pH and EC of the aquaponic solution was ranged from 7.6 to 4.9 and 0.24－0.91 dS·m-1, respectively. The concentration of NO3-N was about 28% lower than that of the hydroponic standard solution, and K, Fe and B were 10, 27 and 3.8 times lower, respectively; however, the mineral contents of strawberry leaves were in the appropriate ranges with lower contents in the leaves grown with sponge media. The organic content (OM), nitrogen (N), phosphorus (P), and potassium (K) of the sludge were 61.5, 5.72, 8.92, and 0.24%, respectively. The leaf area, leaf number, and dry and fresh weights of shoot at 81 DAT were significantly higher in the hydroball, and the average number of fruits per plant was significantly higher in both the orchid stone and hydroball. There was no significant difference in the fresh and dry weights of fruits. Integrated all the results suggest that the orchid stone and hydroball media are more effective to utilize nutrients in solid particles of aquaponic solution, compared to the polyurethane sponge.