• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.3
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• pp.157-160
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• 2002

This study was carried out to the harvesting efficiency of equipment used fer harvesting of rhizomes of Saururus chinensis Bail. Labor-saving efficiency showed 60-67% enhancement by using tillage operations with power tiller, digger attached to power tiller, and digger attached to tractor compared with manual harvest. Loss percentage of rhizomes by harvesting equipments was 2.2-8.8% lower than by manual harvest. Fresh rhizome yield and income index were increased 3-10% and 13-27% respectively by harvesting equipments, showing the highest yield and index in digger attached to tractor, Thus, digger attached to tractor showed the most effective harvest equipment for Saururus chinensis rhizome.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.59 no.3
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• pp.299-306
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• 2014

Fresh edible sweet corns demand relatively short period to harvest fresh ears, which can allow farmers to make a choice sweet corns for various cropping systems. For this reason, we were to find the optimum planting date of late-planted sweet corns to sell fresh ears in the autumn linked to cropping system with winter crops, investigating yield and properties of marketable fresh ears and growth traits of sweet corns (cv. 'Godangok' and cv. 'Guseulok') depending on planting dates such as 10 July, 20 July, and 30 July in Suwon 2012 and 2013, respectively. The 20 July-planted sweet corns showed the most fresh ear yield. However, the 10 July-planted and the 30 July-planted had 32% less yield caused by consecutive rainfall from 10 July through 20 July, and 15% less yield due to low air temperature during ripening than the 20 July-planted, respectively. The 10 and 20 July-planted sweet corns had average 140g of a fresh ear weight and 15% heavier ear than the 30 July-planted. For the July-planted sweet corns, silking days after planting ($r=-0.80^{**}$), and harvesting days after silking ($r=-0.97^{**}$) and planting ($r=-0.91^{**}$) were highly negatively correlated with daily mean air temperature during the period, resulting in it takes 1,100 growing degree days (GDD) to harvest fresh ears from the July-planted sweet corns. The fresh ears of the 20 July-planted sweet corns are able to be harvested by early October. Therefore it will be a good choice for the cropping system based on winter vegetable cash crops such as temperate garlic and onion with medium or late maturity. Among three planting dates 20 July-planted sweet corns had the best field performance in every year considering fresh ear yield, ear size, and stability to grow.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.2 no.11
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• pp.4-10
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• 1981

현대 농업에서 농약을 사용하지 않는다면 벼의 경우 26.8$\%$의 수량감소를 면치 못하고 있으며, 재배관리가 양호한 사과밭에 농약을 사용하지 않고 사과를 재배한 결과 약 40$\%$의 수량 감소를 보였을 뿐 아니라 시장에서 상품으로서의 불합격율이 80$\%$에 달하였다.

• Horticultural Science & Technology
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• v.18 no.4
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• pp.503-507
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• 2000

This study was conducted to investigate the effect of shoot training method on the plant growth and fruit quality and yield of 'Sinsakigake-2' and 'Shishito' peppers (Capsicum annuum L.) grown in the glasshouse. Plants were either left untrained as control or trained at the third node leaving two or four shoots per plant. The untrained control plants had no pruning and therefore had all the lateral branches. The growth was enhanced in plants with two trained shoots in both cultivars. Fruit length and width, fruit weight, and pericarp thickness were not affected by the number of shoots trained. However, the percent marketable fruits was the highest in plants with two trained shoots, and the number of marketable fruits per plant was the highest in plants with four trained shoots. Marketable yield in plants with four trained shoots increased 15% in 'Sinsakigake-2' and 5% in 'Shishito' as compared to that of the control. Results of this study showed that yield and quality of pepper fruits were promoted by training with four shoots and the effect was more pronounced in 'Sinsakigake-2' than 'Shishito' pepper.

• Research in Plant Disease
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• v.7 no.1
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• pp.31-36
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• 2001

To establish an effective chemical control strategy against powder mildew of sweet pumpkin (Cucurbita maxima Duchesne) caused by Sphaertheca fuliginea, screening of effective fungicides and determination of their application times were conducted. Powdery mildew caused by S. fuliginea began to occur at about 80 days after transplanting and continuously increased until harvesting in Korea. Systemic fungicides, such as difenoconazole, triforine, bitertanol, and triflumizole, were effective for controlling powdery mildew, showing control efficacies of about 80-90%. When the fungicide triflumizole was applied 3 or 4 times from the beginning day of the disease at 10-day intervals, about 92.0% and 94.6% of disease control and yield increase of 7% and 9% were obtained, respectively. Therefore, the proper application of triflumizole for controlling powdery mildew of sweet pumpkin must be done more than 3 times.

• Information Systems Review
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• v.19 no.2
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• pp.71-94
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• 2017

Recommender systems reduce information overload and enhance choice quality. This technology is used in many services and industry. Previous studies did not consider recommendation quantity and the repetitive recommendations of an item. This study is the first to examine recommender systems by considering recommendation quantity and repetitive recommendations. Only a limited number of items are displayed in offline stores because of their physical limitations. Determining the type and number of items that will be displayed is an important consideration. In this study, I suggest the use of a user-based recommender system that can recommend the most appropriate items for each store. This model is evaluated by MAE, Precision, Recall, and F1 measure, and shows higher performance than the baseline model. I also suggest a new performance evaluation measure that includes Quantity Precision, Quantity Recall, and Quantity F1 measure. This measure considers the penalty for short or excess recommendation quantity. Novelty is defined as the proportion of items in a recommendation list that consumers may not experience. I evaluate the new revenue creation effect of the suggested model using this novelty measure. Previous research focused on recommendations for customer online, but I expand the recommender system to cover stores offline.

• Journal of Bio-Environment Control
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• v.10 no.3
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• pp.187-196
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• 2001

Asparagus varieties popular in the foreign countries were collected and tested on their productivities and qualities for five years under rain shelter and open field conditions. Among the tested varieties, cultivars of UC309 and Excel showed superior productivity to the others in spear weight but the initial growth was not different among the tested varieties. However, the growth index was higher than the other varieties. According to the result from eight-year experiment, the best variety in productivity and quality were UC309 and Excel both for rain shelter and open field cultivations. To avoid the damage caused by stem blight, rain shelter and soil surface mulching treatments were tested with var. Excel. The spear sprouting and first harvesting date were a few days earlier in rain shelter cultivation than in open field, but there were no differences among the mulching materials. The number of spears and the spear weight per plant were increased in rain shelter cultivation, especially with rice straw and black P.E. mulching treatments. Marketable yield also increased by 253% in black P.E film mulching in rain shelter cultivation compared to non-mulching in open field. The stem blight examined in the autumn, 1997 was not observed under rain shelter treatment, but severe damage was observed in the open field regardless of the mulching materials. In the experiments, high asparagus yield could be achieved by black P.E. film mulching in rain shelter cultivation without the occurrence of stem blight.

• Journal of Bio-Environment Control
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• v.9 no.3
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• pp.151-155
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• 2000

In order to investigate the optimum irrigation point by soil water tension in oriental melon grown in plastic greenhouse during low temperature season, irrigation points from 10 days before fruiting to 10 days before harvesting were examined with 10, 20, 30 and 50 kPa, respectively. Total amount of water applied was 92.5mm at 10kPa but not irrigated at 50kPa due to the unreach of irrigation point. Fruit weight increased with increased soil water content; it was 456g at 10kPa but 324g at 50kPa. While marketable yield of fruit was lowest at 10 kPa due to increased fermented fruit. Sugar content in fruit was highest at 30 or 50 kPa but lowest at 10kPa. As a result, for higher sugar content and marketable yield, the recommended irrigation point is 30kPa of soil water tension.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.90-90
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• 2018

고사리(Ferns)는 고사리 속(Pteiidium spp.)에 속하는 양치식물의 총칭으로서 우리나라에는 22과 70속 272종이 분포되어 있는 것으로 보고되었다. 고사리의 어린 순에는 가식부 100g 당 칼슘 15.0mg, 칼륨 185.0mg 등이 함유되어 있으며 골다공증, 심혈관질환 등에 효과가 있고 식이섬유로 인해 변비 예방에도 유용한 것으로 알려져 있다. 2017년 기준 우리나라의 고사리 재배면적은 3,280ha 수준으로 그중 전라북도의 고사리 재배는 재배면적 285ha이며 연간 생산량 1,985톤으로 전국 생산량의 21%를 차지하고 있어 전라북도의 산채 재배작목 중 중요한 비중을 차지하고 있다. 고사리 재배는 정식 후 수확기간이 길고 제초노력 등의 노동력 의존도가 상대적으로 낮아 최근 재배면적이 늘어나고 있는 추세이나, 종근의 적정 규격 등에 대한 기준이 제시되지 않아 경영비 부담이 큰 실정이다. 본 연구는 고사리 종근 규격을 종근 두께 기준 A등급($14.1{\pm}3.31mm$), B등급($8.3{\pm}1.88mm$), C등급($3.3{\pm}2.31mm$)로 구분하여 표고 500m의 허브시험장 연구포장에 3월 28일 정식한 후 2018년 4월부터 신초 출현양상 및 수량성을 조사하였다. 파종 2년차 고사리 신초의 출현양상은 4월 11일부터 출현을 시작하여 6월 11일 까지 빠르게 증가하여 7월 9일 이후 고온기이후 증가세가 완만해지는 경향을 보였고 9월 10일까지 누적 신초수는 A 등급 파종구에서 80.0개를 보였다. 신초 출현 후 포자엽이 전개되어 상품성을 상실하기까지의 포자엽 전개일수는 주 수확시기인 4~5월에는 5.3~6.7일이 소요되었으나, 포자엽 전개이후 울폐가 이루어지는 8~9월에는 9.7~11.7일이 소요되어 생육 초기 차광에 의한 전개일수 연장효과가 기대되었다. 생육기간 동안 조사시기별 신초의 두께는 6월 11일과 9월 11일 조사한 신초에서 굵어지는 경향을 보였고, 상품성 있는 고사리 신초의 규격을 신초장 20cm로 포자엽 전개 직전으로 한정하여 수확을 실시한 결과 파종 2년차 수확은 4월18일 이후 4회 이루어졌으며 신초의 생체중은 5.2~6.0g/개의 범위로 종근 규격 간에는 차이가 인정 되지 않았다. 4월 18일에서 5월 8일까지의 수확기간 동안 누적 신초 수확량은 A 등급과 B 등급의 종근을 파종한 처리에서 각 32.2개/$m^2$, 30.3개/$m^2$로 C 등급 파종구에 비해 유의하게 수확 신초수가 증가하였다. 단위면적당 신초 수량성은 4월 30일 3회차 수확시부터 종근 규격간 차이가 있었으며 누적 신초수량은 A 등급과 B 등급 파종구에서 각 183.3kg/10a, 169.9kg/10a로 유의하게 높았는데 이는 파종된 종근의 두께에 따라 상품성 있는 신초 출현수가 유의하게 증가된 때문으로 판단되었다.

• Journal of Bio-Environment Control
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• v.32 no.2
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• pp.132-138
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• 2023

The Gymnocalycium mihanovichii has been an important export item of Korean flower industry for a long time. Although there is a high demand for grafted cactus from overseas, its production for export is limited. In this study, the growth and marketable yield characteristics of Gymnocalycium mihanovichii 'I-Hong' were compared between soil culture and ebb-and-flow hydroponic system with single- or double-tier bench. As a result, hydroponic methods with single-tier bench resulted in higher fresh weight and glove diameter compared to other cultivation methods. In the ebb-and-flow hydroponic system, hydroponic system with double-tier bench of grafted cactus traits has a lower growth rate than other cultivations. However, the hydroponic system with double-tier bench of grafted cactus significantly increased the yield. In conclusion, the yield from hydroponic system with double-tier bench was better than soil cultivation method. Although there were some differences in color depending on the cultivation method, it was considered that there was no difference in appearance of Gymnocalycium mihanovichii 'I-Hong'. Our results suggest the cultivation methods to overcome production constraints, expand their exports, and improve the value-added characteristics of grafted cactus.