• 한국약용작물학회:학술대회논문집
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• 2011.09a
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• pp.388-389
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• 2011

• 한국약용작물학회:학술대회논문집
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• 2011.09a
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• pp.386-387
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• 2011

• 한국약용작물학회:학술대회논문집
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• 2010.10a
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• pp.258-259
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• 2010

• Korean Journal of Soil Science and Fertilizer
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• v.46 no.5
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• pp.322-326
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• 2013

Many organic fruit growers adopt cover cropping in their orchards to improve soil properties. A field experiment was conducted to determine the effects of cutting frequency of cover crop (CF) and liquid manure application (LM) on green manure production (GMP) and returnable nutrient content (RNC) in pear orchard. The combined effects of CF and LM were tested at two levels, respectively, with liquid manure ($L_1$) and without liquid manure ($L_0$). After that, cover crops were cut once ($C_1$) and three times ($C_3$) in rye, and twice ($C_2$) and four times ($C_4$) in hairy vetch. The result showed that main factors related to green manure production were different depending on the species. In rye, LM was more effective in increasing the dry weight of cover crop and RNC than CF. In contrast, the parameters were more affected by CF rather than LM in hairy vetch. Thus, it is suggested that different management technique is needed depending on the cover crop species in order to maximize the green manure production in pear orchard.

• Journal of People, Plants, and Environment
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• v.24 no.4
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• pp.329-339
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• 2021

Background and objective: This study was conducted to obtain empirical data for deriving necessary items for the creation and management of gardens in urban agricultural parks while maintaining the publicness of the place by examining the difference in perception among park visitors about the gardens in the public parks. Methods: A survey was conducted on users of urban agricultural parks in 6 locations and 113 copies of the questionnaire were collected. After understanding the demographic characteristics and the current use of the garden, we identified the importance of the necessary items for the public gardens. Results: 108 subjects(95.6%) responded that gardens are needed in urban parks, for psychological and emotional health (26.2%) and for interaction and friendship with family and neighbors(23.2%). For use of garden crops, most were private sales(96 subjects, 64.4%), and both sales preferred to partially donate their crops. Most used communal gardens operated by public institutions(30.1%). It was found that 96.4% of the respondents were satisfied with gardening activities, and 107(94.7%) of them showed their intention to participate in the gardening in the future. The Kaiser Meyer Olkin value was .848 and the significance level was .001, proving the validity of factor analysis. The factors were named composition elements(Factor 1), management items(Factor 2), convenience elements(Factor 3), and operational facilities(Factor 4). In the survey on the creation and management of gardens in urban agricultural parks, there were no statistically significant differences, but all items had correlations. Conclusion: The results have reflected the needs of actual users in establishing the plans to operate urban gardens, thereby having great utility value as the basic data for continuous garden management. Further research can be conducted to derive detailed elements that can guarantee sustainability of urban gardens and suggest high-quality data for management of gardens in urban agricultural parks.

• Korean Journal of Soil Science and Fertilizer
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• v.47 no.6
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• pp.558-562
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• 2014

Cover cropping and liquid manure application are considered as effective ways to replace the use of chemical fertilizer in orchard. This study was conducted to investigate the effect of cover crop species and liquid manure application rate on green manure production, leaf mineral content, fruit quality and soil chemical properties in pear orchard. The treatments include rye and hairy vetch as cover crops, two liquid manure application levels based on N and $K_2O$ requirement on each cover crop species, and chemical fertilizer as control. Green manure production was higher in hairy vetch than in rye. K content of pear leaves and soil exchangeable K content increased in N based liquid manure application treatments. The yield was higher in rye + liquid manure and fertilizer treatments, and fruit quality was not different between the treatments. Taking all of these into account, rye + $K_2O$ requirement-based liquid manure application is recommended in pear orchard for not only sufficient nutrient supply but also prevention of any problem related with soil $K_2O$ accumulation in pear orchard in long-term perspective.

• The Korean Journal of Pesticide Science
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• v.14 no.1
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• pp.37-48
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• 2010

The diacylhydrazine insecticides, methoxyfenozide, chromafenozide and tebufenozide are new-generation insecticides. These insecticides induce premature molting and cause the death of insects by mimicking their hormone. Also, these insecticides have already been widely used for vegetables planting in worldwide. Highperformance liquid chromatography (HPLC) is the most widely used procedure for determination of each compound residues in crops. However, simultaneous analysis method of these diacylhydrazine insecticides was not reported. The purpose of this study is to develop a simultaneous determination procedure of methoxyfenozide, chromafenozide and tebufenozide residue in crops using HPLC-UVD/MS method. These insecticide residues were extracted with acetone from representative samples of five raw products which comprised hulled rice, soybean, apple, pepper, and Chinese cabbage. The extract was diluted with saline water, and dichloromethane partition was followed to recover these insecticides from the aqueous phase. Florisil column chromatography was additionally employed for final cleanup of the extracts. The analytes were quantitated by HPLCUVD/MS, using a $C_{18}$ column. The crops were fortified with each insecticide at two levels per crop. Mean recoveries ranged from 89.0 to 104.8% in five representative agricultural commodities. The coefficients of variation were less than 3.9%. Quantitative limits of methoxyfenozide, chromafenozide and tebufenozide were 0.04 mg/kg in crop samples. A HPLC-UVD/MS with selected-ion monitoring was also provided to confirm the suspected residues. The proposed simultaneous analysis method was reproducible and sensitive enough to determine the residues of methoxyfenozide, chromafenozide and tebufenozide in agricultural commodities.

• Korean Journal of Medicinal Crop Science
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• v.27 no.3
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• pp.202-207
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• 2019

Background: Rehmannia glutinosa is a perennial herb belonging to the family Scrophulariaceae and is used in traditional oriental medicine. This study was conducted to evaluate the appropriateness of plug-seedling cultivation for replanting of R. glutinosa. Methods and Results: The seed rhizomes of Rehmannia glutinosa 'Jihwang 1' were harvested in the middle of March, 2018. Direct seedling cultivation was conducted after air curing for 3 days. The seedlings for transplanting were cultivated for 30 (30D), 45 (45D), and 60 days (60D). The mat formation rates of the 30D, 45D and 60D treatment seedling were 81.3%, 100%, and 100%, respectively. Of the tree treatment groups, flowering occurred only in the 45D and 60D treatment groups, and their flowering rates were $7.3{\pm}3.06%$ and $13.3{\pm}1.15%$, respectively. The agronomic characteristics and active components of the three treatment groups were evaluated in comparison with the DS1 (directly seeded group, control) and DS2 (directly seeded group, replanting) groups. As a result, the leaf length and leaf width of the 30D seedlings were higher than other treatment groups, but the number of leaves per plant was statistically the same. In addition, root diameter and yield of the 30D seedling were statistically the same as DS1. Moreover the catalpol contents of 30D, 45D, DS1 and DS2 group seedlings were 2.23%, 1.86%, 2.50% and 2.08%, respectively. Conclusions: Taken together, these findings suggest it is feasible to use the plug-seedling cultivation method for replanting of R. glutinosa. seedlings. However, further evaluation of the economic aspect is needed.

• The Korean Journal of Pesticide Science
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• v.19 no.3
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• pp.264-271
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• 2015

Stink bugs do damage on various crops including upland crops and tree fruits. Especially, yellow-brown stink bug (Halyomorpha halys ($St{\aa}l$)) and brown-winged green (Plautia stali) are severely damaged on apple orchard. Using seven insecticides - dinotefuran WP, etofenprox WP, chlorpyrifos WP, cabaryl WP, chlothianidin SC, flonicamid WG, and bifenthrin WG - registered on apple, contact and residual toxicities were tested on both male and female of P. stali and H. halys that preferred apple fruit. Contact toxicity of dinotefuran WP was excellent on male P. stali 48 hours after treatment (HAT) with 96.7% and significant on male Halyomorpha halys 48 HAT with 74.5% but the others had low effect. Contact toxicity on these stink bugs were higher in male than female. All insecticides except flonicamid, residual effects were all effective on both male and female of P. stali, while chlorpyrifos and bifenthrin were showed higher residual toxicity on both male and female of H. halys in laboratory condition. Two insecticides, chlorpyrifos and bifenthrin, were selected for the field test. Bifenthrin have a high residual effect on P. stali until 5 days after treatment, but have a low residual toxicity on H. halys in the field test. Chlorpyrifos showed higher residual toxicity in the laboratory, however, showed low residual efficacy on two species stink bug onto the field.

• Korean Journal of Medicinal Crop Science
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• v.23 no.3
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• pp.223-230
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• 2015

To study the effect of crop rotation on the control of ginseng root rot, growth characteristics and root rot ratio of 2-year-old ginseng was investigated after the crops of 18 species were cultured for one year in soil contaminated by the pathogen of root rot. Fusarium solani and Cylindrocarpon destructans were detected by 53.2% and 37.7%, respectively, from infected root of 4-year-old ginseng cultivated in soil occurring the injury by continuous cropping. Content of $NO_3$, Na, and $P_2O_5$ were distinctly changed, while content of pH, Ca, and Mg were slightly changed when whole plant of crops cultured for one year were buried in the ground. All of EC, $NO_3$, $P_2O_5$, and K were distinctly increased in soil cultured sudangrass, peanut, soybean, sunnhemp, and pepper. All of EC, $NO_3$, $P_2O_5$, and K among inorganic component showed negative effect on the growth of ginseng when they were excessively applied on soil. The growth of ginseng was promoted in soil cultivated perilla, sweet potato, sudangrass, and welsh onion, while suppressed in Hwanggi (Astragalus mongholicus), Deodeok (Codonopsis lanceolata) Doraji (Platycodon grandiflorum), Gamcho (Glycyrrhiza uralensis), Soybean. All of chicory, lettuce, radish, sunnhemp, and welsh onion had effective on the inhibition of ginseng root rot, while legume such as soybean, Hwanggi, Gamcho, peanut promoted the incidence of root rot. Though there were no significant correlation, $NO_3$ showed positive correlation, and Na showed negative correlation with the incidence of root rot.