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Jongtae Lee,Juyeon Kim,Jin-HyeukKwon,Young-Ho Chang,Young-Seok Kwon,Tae-Ja Kim,Mi-Jung Park,Mi-Ae Kim,Hyang-Mi Lee 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.6
We evaluated and classifi ed forty fi ve onion cultivars according to bulb initiation, bulb and scale characteristics, mineralsand organic compounds contents, and storage quality in South Korea during 2016/2017 and 2017/2018 growing seasons. Field experiment was conducted in randomized block design with three replications. Bulb initiation ranged from 153 daysafter transplanting (DAT, April 2) to 177 DAT (April 26). Fresh bulb weight (FBW) and bulb index (BI) were 285.5 ± 18.5 g/individual, 0.93 ± 0.05, respectively. Number of scales (NS), number of center (NC), and scale thickness (ST) were 7.6 ± 0.2,2.3 ± 0.2, and 5.5 ± 0.2 mm/scale, respectively. Chroma and Lightness of bulb skin were 27.1 ± 1.9, 61.2 ± 2.3, respectively. Storage loss (SL) on December 12 was 19.4 ± 5.9%. Nitrogen (N), Carbon (C) and sulfur (S) contents were 1.36 ± 0.14,37.9 ± 3.2 and 0.40 ± 0.06 mg kg −1 on a fresh weight basis. Total soluble solids (TSS) and total phenolics content (TPC) were8.6 ± 0.6 °Bx, 164.8 ± 15.6 mg GE kg −1 on a fresh weight basis. Days from transplanting to bulb initiation was signifi cantlypositively correlated with bulb height, NC, dry matter, N, C, S, TSS, TPC, total fl avonoids content (TFC) etc., while it wasnegatively correlated with rot loss and SL. Dry matter content was signifi cantly positively correlated with N, C, S, TSS,TPC, TFC etc., while it was negatively correlated with SL. Storage loss was negatively correlated with N, S, Potassium andTSS. Dendrogram of agglomerative hierarchical clustering for the forty fi ve cultivars based on bulb initiation, bulb and scalecharacteristics, and bulb minerals and organic compounds contents classifi ed fi ve cultivar groups. Cluster 1 featured the earliestbulb initiation and the greatest SL. Cluster 2 featured the fewest NS and NR, and the thickest ST. Cluster 3 featured thegreatest FBW, and the most NS and NC. Cluster 4 featured the greatest BI and the thinnest ST. Cluster 5 featured the lowestSL, and the highest minerals and antioxidant compounds contents. This information should be helpful for onion growers todecide onion cultivar and for onion breeders to promote new cultivars depending on their purpose.
Evaluation of Composted Pig Manure and Organic Fertilizer for Organic Onion Production in Paddy Soil
Jongtae Lee,Heedae Kim,Sangdae Lee,Chiwoong Ro 한국원예학회 2012 원예과학기술지 Vol.30 No.2
A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion (Allium cepa L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 ton·ha-¹, and accompanied by organic fertilizer with 240 ㎏·ha-¹ nitrogen for all treatments. There was a positive linear effect on the marketable bulb yield with increasing applications of pig manure. However, pig manure rates of 6.0 or 8.0 ton·ha-¹ did not affect the marketable yields or bulb weights at harvest. There was no significant difference between pig manure application rates and mineral concentration or nutrient uptake in onion bulbs. Soil pH and electric conductivity (EC) were lower at harvest compared to preplant soil, while exchangeable potassium and calcium contents increased at harvest. However, there were no significant effects on soil pH, EC, and organic matter or exchangeable cations caused by different pig manure application rates. Mineralized NO₃-N content was not affected by pig manure application rates except at transplanting and 129 day after transplanting. Based on the results of this study, when organic fertilizer is applied at a rate of 240 ㎏·ha-¹ N, 6.0 ton·ha-¹ composted pig manure should be adequate for producing onions using an organic production system.
Influence Analysis of Environmental Data for the Growth of Paprika
Jongtae Lim,Hyuntae Lee,Seungwoo Cha,Jihyeon Choi,Hwanyong Choi,Sangjun Chung,Seoheui Lee,Hyunjung Hwang,Junhyuck Jang,Christopher RETITI DIOP EMANE,Yuna Kim,Kyoungsoo Bok,Jeonghyun Baek,Jaesoo Yoo 한국콘텐츠학회 2022 한국콘텐츠학회 ICCC 논문집 Vol.2022 No.12
Jongtae Lee,Kyuhyun Park 한국농식품정보과학회 2017 Agribusiness and Information Management Vol.9 No.2
Abstract1)This study aims to understand why public information systems in agricultural fields have shown lower performances than other industrialized fields and industries and how these problems would be fixed and overcame. To accomplish this research purpose, this study would overview the previous studies on developing agricultural information systems in public sectors and would find out meaningful and considerable factors. This study would accept the methodologies of literature review and systems thinking approaches to understand the relationships among the found factors and to suggest the conceptual research model. Agricultural information system should take care to reduce implement and maintenance costs to reduce the negative relationships between costs and expected service value and between expected service value to perceived service value. Also, it should be understood that impersonal response would reduce the eager to use the services, so the government sectors should consider positively to adopt the concept of CRM even though the government sectors traditionally have ignored its necessity. The failure of public information systems/services may be caused not only by lack of the contents but also by the failure of the persistent post management.