• Research in Plant Disease
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• v.15 no.1
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• pp.36-40
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• 2009

This research was accomplished to screen the cultivar which is suitable in organic cultivation of the broccoli having good horticultural characteristics and the resistance to black rot. Thirteen cultivars of the broccoli were planted at Gangwon alpine areas of Pyeongchang county and Gangneung city and investigated the horticultural characteristics in 2006. Everybro, Tamsuerun, Nockjae, and Pilgrim had good horticultural characteristics in all two experimental fields. The resistance and susceptible reactions regarding the black rot of broccoli cultivars were different from according to two fields. This result means that physiological race of black rot pathogen distribute in Gangwon alpine areas. Everybro and Nockguck were resistance to black rot in all two experimental fields. Also these two cultivars had good horticultural characteristics. We recommend that Everybro and Nockguck will be suitable in organic cultivation.

• Research in Plant Disease
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• v.17 no.1
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• pp.95-98
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• 2011

This research was carried out to selection of desirable cultivar for organic cultivation of carrot in Korea. The assay of disease resistance, insect tolerance and rate of bolting were investigated on 32 cultivars of genetic resources of carrot. This experiment was carried out at experimental field and greenhouse of Gangneung-Wonju National University. 'PI 223360' was resistant against powdery mildew. Ten cultivars including 'Oxheart Carrot Heirloom' were moderately resistant, 22 cultivars including 'Long Impeator #58' were susceptible to powdery mildew. Although there was no resistant cultivar against black rot and leaf blight, our results showed that several cultivars have moderate resistance. Thirteen cultivars including 'Oxheart Carrot Heirloom' were having insect (Erythroplusia pyropia) tolerance and 'SA 102' and 'Scarlet Keeper Carrot Rare' were susceptible. According to the investigation of bolting, 6 cultivars including 'Hongsim Ouchon Carrot' were early bolting and 4 cultivars including 'Japanese Imperial Long Carrot' were moderate bolting. Other cultivars were identified as late bolting. From above results, we confirmed that 'Oxheart Carrot Heirloom' was suitable cultivar for organic cultivation among 32 genetic resources of carrot.

• Korean Journal of Organic Agriculture
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• v.8 no.1
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• pp.111-129
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• 1999

In order to get some basic data to check the environmental sound function against soil and water pollution and the safe vegetable production by korean organic farming where an internationally recognized basic concepts of soil fertility management for organic farming is not practiced and only applying the organic fertilizer to maintain the soil fertility, the chemical characteristics of soils and $NO_{3}^{-}$ content of chinese cabbage and lettuce cultivated by the conventional farming, greenhouse cultivation and organic farming were investigated. The highest value of $NO_{3}^{-}$-N in 0~30cm subsoil among the three different farming systems was found in the subsoil of organic farming and it was 3.6 and 6.6 times higher than those of conventional farming in chinese cabbage and lettuce respectively. $P_2O_5$ accumulation in the rhizosphere by organic farming also showed the highest value. The accumulation of $NO_{3}^{-}$-N and $P_2O_5$ in organic farming soil were similar or even more higher to those of greenhouse cultivation. The $NO_{3}^{-}$ accumulation in the vegetable by organic farming reached 3224ppm for chinese cabbage and 2543ppm for lettuce, and it were 4.7 and 6.4 times higher than those by conventional farming. It was concluded that there is urgently necessary to introduce the main concepts of soil fertility management of the Basic Standard of IFOAM, EU regulation and FAO/WHO Codex Alimentarius on organic agriculture(draft) into korean organic agriculture for the operation of environmental sound system and the production of sate vegetable in terms of $NO_{3}^{-}$ content.

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.121-121
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• 2022

When 7 kg·10a^-1, which is less than the nitrogen standard application amount of 9 kg·10a^-1, is applied, the protein content is lowered and the palatibility is improved. In order to examine the applicability of nitrogen fertilization of 7 kg·10a^-1 nationwide, soil samples were collected from 240 paddy fields in 8 provinces in 2021, and the organic matter content, effective phosphoric acid, and effective silicic acid were analyzed for each sample. As a result of one-way ANOVA analysis between samples collected for each province, there was no significant difference in the content of organic matter, effective phosphoric acid, and effective silicic acid except for some provinces. The contents of organic matter was higher than the appropriate level(25 ~ 30 g·kg^-1) except for Gyeongsangbuk-do, the effective phosphoric acid was higher than the appropriate level(80~120 mg·kg^-1) in all provinces, and the effective silicic acid was lower than the appropriate level(157 ~ 180 mg·kg^-1) except for Gyeonggi-do, Jeollanam-do and Gyeongsangnam-do. As a result of analyzing the recommended fertilization amount based on the nitrogen application amount of 7 kg·10a^-1, 68.3% ofthe 240 samples were able to give nitrogen fertilizer less than 7.5 kg·10a^-1, and the rest had to be given more than that to satisfy the standard fertilization amount. As a result of this study, 68.3% of rice paddies nationwide can be cultivated with a standard fertilization amount of 7 kg·10a^-1, however it was thought that continuous nutrient management would be required for other paddies.

• Korean Journal of Organic Agriculture
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• v.19 no.spc
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• pp.195-198
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• 2011

To screen several promising red pepper cultivars, may be adaptable to organic cultivation conditions, seventy six F1 hybrids commercial and eight local purebred red pepper cultivars were tested. Comparing the infection rate of phytophthora blight between commercial (F1 hybrid) and local (Purebred) cultivars, average infection rate of commercial cultivars was 9.8% and that of local cultivars was 17.8%. But the infected fruits rate of anthracnose in field were similar as 3.3% in commercial (F1 hybrid) and 3.1% in local (Purebred) cultivars. In yield characteristics, average yield of commercial cultivars was 2.89 t $ha^{-1}$ and that of local cultivars was 2.22 t $ha^{-1}$. For organic pepper farmers it is more favourable to cultivation purebred cultivars because they can save to the same quality plant next year's crop. In this study among the local purebred cultivars, two cultivars are promising that their yield near to 3 t $ha^{-1}$ and have disease field resistance.

• Korean Journal of Organic Agriculture
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• v.24 no.3
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• pp.355-368
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• 2016

There are growing interests in environmental friendly cultivation for the matter of health concern. This study analyzes an economic efficiency of strawberry and tomato farming by considering the role of environmentally friendly cultivation. The Database of Rural Development Administration is used for strawberry and tomato farming households. We adopt a Bayesian stochastic frontier model to resolve a small sample property of the data. Empirical finding is that environmentally friendly cultivation improves the revenue of farming but the effect on net profit is not conclusive which calls for future research.

• Magazine of the Korean Society of Agricultural Engineers
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• v.40 no.2
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• pp.159-170
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• 1998

This study was initiated to investigate the applicability of the dredged soil from agricultural reservoirs on the crop cultivation. Four reservoirs were selected for this experiment, and properties of the dredged soils were analyzed physically and chemically. Soil textures were sandy loam(SL), silty loam(SiL), gravelly loam(GL), graveHy silty loam(GSiL), respectively. General chemical components, organic matter contents, main cations, heavy metals, etc. showed no adverse effects on crop growth. Tomato, cucumber, radish, Chinese cabbage were cultivated during 8 months period, in the soil treated with fertilizer and compost(Tmt.1), fertilizer(Tmt.2), compost(Tmt.3) and none (Tmt.4). Data for plant height, root zone depth and crop yield were collected and analyzed, and the yield for most crops showed increase as Tmt.1 >Tmt.2>Tmt.3>Tmt.4 by fertilizing methods, and as GL>GSiL>SL>SiL by soil textures. From the results, the crop cultivation using dredged soil was considered to be effective, due to its soil texture, organic matter content and fertilization.

• Korean Journal of Organic Agriculture
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• v.25 no.1
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• pp.71-84
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• 2017

Hot pepper growth in no-tillage cultivation on recycled ridge was increased by 22% compared with tillage cultivation. At 3 years after no-tillage cultivation, hot pepper growth was increased by 12% compared with tillage cultivation. Dry weight of unripe hot pepper at 2 years of no-tillage cultivation was 348.4 kg/10a increasing 16% compared with tillage cultivation while dry weight of unripe hot pepper was decreased at 3 years of no-tillage cultivation. Bacteria flora at 2 years of no-tillage cultivation was significantly increased compared with tillage cultivation. Bacteria flora was not significantly different at 3 years of no-tillage cultivation. Actinomyces flora at 2 years of no-tillage cultivation was significantly increased compared with tillage cultivation. Actinomyces flora was decreased at 3 years of no-tillage cultivation. Fungi flora at 2 and 3 years of no-tillage cultivation was increased by 1.3 and 1.7 times respectively, compared with tillage cultivation. Generation amount of carbon dioxide at no-tillage cultivation soil was remarkably decreased by 41% compared with tillage cultivation. Population of animalcule in early stage of hot pepper soil was 2 species and 6 individuals on Collembola and Acari at tillage cultivation. Population of animalcule in hot pepper soil was 5 species and 11 individuals including Chilopode at one year of no-tillage cultivation. Population of animalcule in hot pepper soil was 3 species and 5 individuals including Coleoptera and Chilopode at 2 years of no-tillage cultivation. Population of animalcule was 4 species and 40 individuals including Hypogastrurigae and 8 species and 97 individuals including Earwig (Labidura japornica) at 46 days after transplanting on tillage cultivation. Population of animalcule was 9~10 species and 101~107 individuals on no-tillage cultivation. Nature status for environmental change as index organism was 19 points and 33 points, at tillage and no-tillage cultivation, respectively. These results indicate that no-tillage agriculture of korean-style on recycled ridge plays a very important roles on pepper growth, biodiversity of animalcule, and greenhouse gases at plastic film greenhouse soil in no-tillage systems.

• Journal of Wetlands Research
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• v.24 no.2
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• pp.69-82
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• 2022

In this study, we investigated the bacterial community structure in organic rice-fish mixed farming paddy soil by using high-throughput sequencing technology. The results showed that compared with the organic rice cultivated soil, the content of AP (available phosphorus) increased by 310.23 % and the content of OM (organic matter) increased by 168.83%. The most abundant phyla in paddy soils were Proteobacteria, Bacteriodetes, and Chloroflexi, whose relative abundance was above 47.83%. Among the dominant genera, the relative abundance of Limisphaera in paddy soils was observed. Alpha diversity indicated that the bacterial diversity of paddy soils was similar among each other. The bacterial community structure was affected by the relative abundance of bacteria, not the species of bacteria. Principal Coordinated Analysis (PCoA) results showed that the bacterial communities in organic rice-fish mixed farming soil and organic paddy soil were correlated to each other; the bacterial community structure was distinctively grouped by four different systems (paddy soil under organic rice-fish mixed farming system, organic rice cultivation, and conventional rice cultivation), where the first two are closely related to each other than the third one. The results provide basal support for organic agri-cultivation while improving an ecological value at the same time.

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2005.04a
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• pp.87.2-88
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• 2005