• The Korean Journal of Pesticide Science
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• v.5 no.1
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• pp.19-23
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• 2001

This study was conducted to monitor the residue of the herbicide butachlor in major crops. The residue monitoring covered 106 samples of rice, barley, garlic, onion, and strawberry colledted from markets of intensive cultivation area including Kwangju, Daegu, and Pusan. The residue levels in 27 sample of polished rice produced by applying the herbicide were below the detection limits adopted analytical method. The residue levels in 21 sample of garlic, 18 sample of onion, and 18 sample of strawberry which were succeeding crops after paddy rice were also below the detection limits. In consequent, all the samples resulted safe status in terms of the butachlor residue level in agricultural produce.

• Korean Journal of Agricultural Science
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• v.39 no.4
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• pp.491-496
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• 2012

Vegetable seeds are one of the most important key factors to determine the way of vegetable's production, distribution, processing and storage. Unfortunately, because of international exchange crisis in 1997, the most of main Korean seed companies were merged into foreign capitals. Currently, many domestic seed companies are incapable of their own survey and development of vegetable seed markets in foreign countries. To provide valuable seed market information for these companies, China, especially Yunnan and Guangdong provinces in China, was selected. Since China is one of the major vegetable seed importers. Also, Yunnan and Guangdong provinces are the most promising targets to export Korean vegetable seeds. The current status of vegetable production in China was analyzed with consideration of Yunnan and Guangdong provinces. The contents of survey and analysis are covering major vegetable crops' cultivation area, farm number, cultivation type, production amount, market price, farm income, packaging method, distribution type and amount of seed consumption. And particularly, major horticultural characteristics of leading varieties were presented to assist the development of exportable varieties of domestic seed companies. We assume the results of this study would be practically usable for the development of exportable varieties.

• Journal of Microbiology and Biotechnology
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• v.28 no.4
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• pp.630-637
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• 2018

The high rate algal ponds (HRAP) powered and mixed by a paddlewheel have been widely used for over 50 years to culture microalgae for the production of various products. Since light incidence is limited to the surface, water depth can affect microalgal growth in HRAP. To investigate the effect of water depth on microalgal growth, a mixed microalgal culture constituting three major strains of microalgae including Chlorella sp., Scenedesmus sp., and Stigeoclonium sp. (CSS), was grown at different water depths (20, 30, and 40 cm) in the HRAP, respectively. The HRAP with 20cm of water depth had about 38% higher biomass productivity per unit area ($6.16{\pm}0.33g{\cdot}m^{-2}{\cdot}d^{-1}$) and required lower nutrients and energy consumption than the other water depths. Specifically, the algal biomass of HRAP under 20cm of water depth had higher settleability through larger floc size (83.6% settleability within 5 min). These results indicate that water depth can affect the harvesting process as well as cultivation of microalgae. Therefore, we conclude that water depth is an important parameter in HRAP design for mass cultivation of microalgae.

• Weed & Turfgrass Science
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• v.3 no.2
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• pp.121-129
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• 2014

We investigated turfgrass diseases and inoculum density at nationwide turfgrass cultivation sites in year of 2013. Occurrences of large patch and rust disease appeared in September. Brown patch recorded in September to October at Namhea and Pythium blight disease occurred outbreaks in early July at Namhea site. Some sites in Namhea damaged 3% area of total cultivation field by Sclerotinia homoeocarp. In Daepyeong (Gyeongnam), Fairy ring and large patch were recorded. Severe takeall and fairy ring have been observed in Gochang-si. Multi-site in Cheongju-si, brown patch was observed in pandemic level. Interesting enough, a cool-season turfgrass cultivate sites in Pyeongtaek-si brown patch, leaf blast, summer patch, and Curvularia leaf spot were investigated during the surveys period. Inoculum densities (Rhizoctonia spp.) at turfgrass cultivations sites were increased as cumulatively in all survey sites. The investigation result indicated that the disease occurrence and pathogens are similar as diseases in golf courses.

• Journal of the Korean Society of Tobacco Science
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• v.21 no.1
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• pp.89-94
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• 1999

This study was carried out to survey the distribution of farm-yard manure by analysis 355 samples collected from major flue-cured and burley tobacco area. The applied manure amount for flue-cured and burley tobacco were 1,500 kg and 1,600 - 2,000 kg per l0a, respectively. The major raw materials of farm-yard manure were cattle dung, chaff, and rice straw. The main manure used for tobacco plant were cattle dung+chaff, cattle dung+rice straw+chaff, cattle dung+rice straw, and poultry dung+chaff, which were mostly unfinished fermentation materials. The chemical characteristics of farm-yard manure were as follows: pH for 87% of samples was higher than 7.1, total nitrogen for 70% of samples was 0.51-1.50%, P$_2$O$_{5}$ for 48% of samples was higher than 1 %, $K_2$O and CaO were 1-2%, MgO was 0.5-1.0%, and Cl was lower than 0.5% level. In general, the manure used for tobacco cultivation was higher contents of chemical components than that of manure made by rice straw. Also, the concentration of chemical compounds in the samples collected from burley tobacco area were higher than that of flue-cured tobacco districts.s.

• Korean Journal of Medicinal Crop Science
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• v.5 no.3
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• pp.243-248
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• 1997

Cyperus rotundus has been grown for a long time in korea to be used as medicinal crop. This study was conducted to survey the production status and economic analysis in chief producing area of Cyperus rotundus in Koryong, Korea. The Koryong area where was the major production area of Cyperus rotundus was composed of 0.6hectare cultivation size per farm household and the processes like cultivation, processing, shipping were formed unitedly. The most general management type was labor-extensive one which use the Nakdong river basin or idle land effectively. The cultivation area have been decreased gradually because the price was very low so that the income per hectare was just 3,880 thousand won and productivity per hectare was just 6,280kg. Thus, production condition was very inferior, it needs some self-help to encourage the production because it has some possibility as only regional special product.

• Journal of Bio-Environment Control
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• v.26 no.4
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• pp.297-300
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• 2017

Plant factory can control artificially the environments for crop cultivation, so they can produce high quality agricultural products all year round. This study was carried to select suitable kohlrabi cultivar for hydroponics in a closed-type plant factory system. We used three cultivars of red kohlrabi, 'Asac kohl', 'Kolibri', and 'Purple king' as plant materials. The artificial light source was LED light, light intensity and photoperiod were $249{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ and 12/12 hours (day/night period), respectively. Hydroponic cultivation type was used circulating deep flow technique. At 43 days after transplanting, fresh weight of whole plant and tuber and leaf area were not significantly different among cultivars. Shoot dry weight and tuber dry weight were highest in 'Asac kohl' cultivar, and number of leaves was highest in 'Purple king' cultivar. Sugar content and yield were highest in 'Asac kohl' cultivar. Considering the growth and marketable yields, 'Asac kohl' was the optimal kohlrabi cultivar for hydroponic cultivation in a closed-type plant factory system.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.64 no.4
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• pp.406-413
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• 2019

The purpose of this research was to analyze the effect of different sowing times on the flowering and maturing of major soybean cultivars by varying day length and temperature in the central plain region. The average of growth period and cumulative temperature in five test cultivars by sowing times were 121 days and 2,972℃ on June 1, respectively and gradually decreased to 85 days, 2,042℃, respectively on July 20. Analysis of the flowering response according to the sowing times showed that flowering was greatly influenced by the decrease of photoperiod until the sowing on July 10, and the minimum number of days for flowering were 27 days, 36 days, respectively in early and mid-rate maturing type in the central plain region. Daepung 2 is classified to the same ecotype with Daewonkong, the total number of growing days was not different between two cultivars, but ripening period (R2-R6) was longer by 5 days and yield was higher by 11% in Daepung 2. The maturity rate was also high and safe enough to maintain more than 90% through the entire sowing times. This ecological characteristic can be usefully applied as a section index for breeding environmental stress resistant and high yielding soybean varieties. The yield of 4 domestic cultivars (except TI196944) sowing on July 20 were 85~92% levels compared to sowing on June 20.

• Korean Journal of Agricultural Science
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• v.26 no.1
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• pp.12-20
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• 1999

The purpose of this study was to research the change of the forest in Myungseo-lee Sanchuk-myun, Chungju where most of the area managed the Swidden Agriculture(Shifting cultivation). The mountainous district should be used and developed the multi-purposing source among the agricultural field, grassland, forest, a recreational area, and an industrial site, and should be presupposed the establishment of synthetic and efficient change system. This study began to pay attention to observe the peculiarity of Swidden Agricultural area in terms of forest aspects and to broaden the outlook of Swidden Agriculture. In the status of Myungseo-lee, prior to the Project to Rehabilitate the Illegal Swidden, from 1973 to 1976, the private forest gets 110.9ha (23ha for Seodae-village, 26ha for Dooduk-village, 6ha for Myungdol-village, 41ha for Chungam-village, 14.9ha for Pangdae-village). In Myungseo-lee. millet and corn were harvested, and they performed the rotation of planting and temporary resting by changing the field. The cultivated acreage per a house of total 5 villages in Myungseo-lee was just 0.4ha in average. The 70ha of the Swidden in Dooduk-village. Myungseo-lee, was sold to the Miwon corp. and the 342ha of that in Myungseo-lee was sold to Seohae-devlp.(SK forest). Those areas afforested. As the regulation plan for the Swidden began, the people in the site got paid for 300,000won as a migration fee. The special feature of the Swidden in Myungseo-lee was that the whole migration village was already established before the regulation plan for the Swidden began, and the yield was harvested by more than other villages the use of chemical fertilizer. And, in the Swidden agriculture, it showed the well-cultivated aspect, and the major harvest was various grains. The regulation Swidden in Myungseo-lee started in 1974.

• Journal of Korean Society of Forest Science
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• v.104 no.3
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• pp.495-502
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• 2015

This study intended to provide basic data required in establishing policies for improving the forestry management and the compensation standard for the loss from non-timber forest products by examining the cost of cultivating key medicinal herbs and the earnings from them to analyze the income. According to the income analysis on the cultivation of medicinal herbs, the average annual income per unit area of Adenophora triphylla var. japonica Hara was the highest as it recorded 14,233,000 won/10a and was followed by Pleuropterus multiflorus TURCZ. which recorded 4,121,000 won/10a, Gastrodia elata Blume 3,766,000 won/10a, Epimedium koreanum Nakai 3,537,000 won/10a, Atractylodes ovata (Thunb.) DC. 2,655,000 won/10a, Aralia continentalis Kitagawat 1,048,000 won/10a, Paeonia lactiflora Pallas 1,025,000 won/10a, and Bupleurum falcatum L. 919,000 won/10a. Compared with the income from major nuts and fruits analyzed in 2014, the average annual income per unit area for medicinal herbs was relatively higher. For Adenophora triphylla var. japonica Hara and Aralia continentalis Kitagawat, soots are used for food and the roots for medicine, it appears that it can become a new income source for the farming and mountain villages. Meanwhile, the price for Paeonia lactiflora Pallas is dropping due to Chinese imports, and also damage to the income from other medicinal herbs due to Chinese imports is expected with the implementation of Korea-China FTA in the future.