• Journal of The Korean Society of Agricultural Engineers
• /
• v.59 no.3
• /
• pp.21-28
• /
• 2017

The main goal of this paper is to assess application of UAV (Unmanned Aerial Vehicle) remote sensing and GIS based images in detection and measuring of rice field drought area in South Korea. Drought is recurring feature of the climatic events, which often hit South Korea, bringing significant water shortages, local economic losses and adverse social consequences. This paper describes the assesment of the near-realtime drought damage monitoring and reporting system for the agricultural drought region. The system is being developed using drought-related vegetation characteristics, which are derived from UAV remote sensing data. The study area is $3.07km^2$ of Wonbuk-myeon, Taean-gun, Chungnam in South Korea. UAV images were acquired three times from July 4 to October 29, 2015. Three images of the same test site have been analysed by object-based image classification technique. Drought damaged paddy rices reached $754,362m^2$, which is 47.1 %. The NongHyeop Agricultural Damage Insurance accepted agricultural land of 4.6 % ($34,932m^2$). For paddy rices by UAV investigation, the drought monitoring and crop productivity was effective in improving drought assessment method.

• Korean Journal of Medicinal Crop Science
• /
• v.19 no.4
• /
• pp.246-250
• /
• 2011

This study was carried out to investigate the characteristics of Rhizome rot incidence of Platycodon grandiflorus by cultivation period and ridge width and furrow depth. The three types of ridge width 0.8, 1.0, and 1.2 m and several levels of furrow depth and 6 levels cultivation period. This experiment was done in farmer's farm and the treatments were also classified in the same spot. In this investigation, ridge width, soil water content, soil hardness, and cultivation period were positively related with Rhizome rot incidence, however, furrow depth was negatively related with that. So this experiment could draw a conclusion : excess water damage and soil hardness could directly or indirectly effect on the Rhizome rot incidence, so cultivation method should be developed such as making underground ditch or cultivation in well draining soil for escaping excess waster damage.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.48 no.2
• /
• pp.108-112
• /
• 2003

Foehn damage on rice plant is one of the important abiotic stresses in eastern costal area of Korea. To know the relationship between foehn impact and morphological traits of rice, wind tunnel method was used with 106 rice cultivars. Less influencing traits on foehn were short panicle, large panicle number per hill, thin panicle neck, and the flag leaf of narrow, short and thick. Leaf pubescence reduced the impact on foehn. 'Naepungbyeo' belong-ed to foehn tolerant varietal group, while 'Ansanbyeo' belonged to the opposite group. Three levels of root cutting treatment with two rice cultivars were conducted to evaluate the foehn impact using wind tunnel. The severity of wind damages was followed the sigmoidal curve duration of wind tunnel treatment were prolonged. Different responses of root cutting to wind tunnel treatment could be used to evaluate the severity of the foehn impact. 'Naepungbyeo' was one of the less implausible cultivars on foehn. 'Nae-pungbyeo' showed tolerant response to wind under 21% root removing treat-ment (20㎝ root cutting), however 'Ansanbyeo' was wilted under the same treatment. In case of 35 % root removing treatment(10㎝ root cutting), both rice cultivars failed to alive against foehn wind.

• Korean journal of applied entomology
• /
• v.35 no.4
• /
• pp.309-314
• /
• 1996

The American serpentine leafminer (ASL), Liriomyza trifolii (Burgess), was fist found from a vinyl house planting gerbera in Kwangju area on January 26, 1994. To learn its distribution and damage pattern on crop plants, a nationwide survey was carried out at 293 vinyl houses from 25 cities/counties in six provinces. Its damage was found at 22 vinyl houses in Kwangju and Chinju areas. The range of leaves damaged by the ASL was 5-100% on gerbera, 40-70% on chrysanthemum, 20% on cherry-tomato, and 5-20% on celery. Host crop plants included gerbera, chrysanthemum, celery, cherry-tomato, watermelon, and pumpkin.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.10a
• /
• pp.54-57
• /
• 2022

Korea has a vulnerable environment from the risk of wildfires, which causes great damage every year. To prevent this, a lot of manpower is being used, but the effect is insufficient. If wildfires are detected and extinguished early through artificial intelligence technology, damage to property and people can be prevented. In this paper, we studied the object double detection method with the goal of minimizing the data collection and processing process that occurs in the process of creating an object detection model to minimize the damage of wildfires. In YOLOv5, the original image is primarily detected through a single model trained on a limited image, and the object detected in the original image is cropped through Crop. The possibility of improving the false positive object detection rate was confirmed through the object double detection method that re-detects the cropped image.

• Korean Journal of Environmental Biology
• /
• v.25 no.3
• /
• pp.223-227
• /
• 2007

Crop loss and damage by wildlife are becoming more serious to residents inside and around National Parks of Korea annually. It could be caused by small size of Parks, which is couples of ten $km^2$ only, and more than a third of total parks' areas are belonging to privates. Wild boar (Sus scrofa) is one of the most harmful pests in nationwide. Treading down crop field using as bedding or resting site are major damaged types and foraging behavior is following. Besides of boars, Korean water deer (Hydropotes inermis), racoon dog (Nyctereutes procyonoides), and badger (Meles meles) are another serious pests. Mainly, farm products planted in upland, such as corns, sweet potatoes, cabbages, etc. are harmed easily, a rate reaches up to 76.9% of whole losses. 92.4% (n=187) of interviewees, who are mostly seniors, cultivate small crop fields smaller than 1 ha. Crop damage would be started from June to late November, time differences are happened due to latitude, climate condition, and crop differences of National Parks. Dusting animal repellents are easier and widespread methods to prevent animal foraging to crop fields and installing noisy makers using gun powder and setting up scarecrows are traditional methods for repelling animals. Nevertheless, effects of these self-defence are turned out to be useful soon after labors done only. Since legal compensation for crop damages by wildlife are not prepared systematically so far, crop loss are rarely reported to local government by most farmers. Systematic and objective methods for quantifying of crop loss by wildlife and population managements system should be offered urgently to well-managed animals habitat and residents' living inside National Parks.

• Journal of Environmental Science International
• /
• v.27 no.8
• /
• pp.641-650
• /
• 2018

Paddy-upland rotation system is one of the important cropping system for improving soil quality and crop productivity. we conducted to investigate the effect of paddy-upland rotation system on soil properties and crop productivity in reclaimed tidal land. The paddy-upland rotation could be effective to conserve soil water contents and prevent from salt damage when cultivating upland crops. The first two years of maize cultivation after rice cultivation could be effective to secure stable production. However, in case of soybean crop, the rotation effect might be lower than that of maize. In the first year, the yield of soybean was 214 kg/10a. In the second and third year, the yields of soybean decreased consecutively to 152, 123 kg/10a respectively. In this paper, it would be suggested that maize be cultivated for up to two years and soybean be cultivated for one year after rice crop grown in reclaimed tidal land. This study could be provide basic data of the physico-chemical properties applicable to paddy-upland rotation system at reclaimed tidal lands.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.52 no.2
• /
• pp.140-145
• /
• 2007

This study was carried out to develop effective test method by soybean stink bug and to screen resistant genetic resources against soybean stink bug. The damage pod rate by stink bug showed 40% of most soybean varieties and was selected about 10% low of 10 varieties by 298 variety and degree in soybean at first year Stink bug damage rate research for 102 varieties that stink bug damage rate lowed at first year showed 10% low of 12 varieties and from 20% to 30% of the other varieties. So testing material is "Ilpumgeumjeongkong" to develop for effective test method soybean stink bug and result for stink bug damage rate research of according to growth stage showed rapidly high more full seed than full pod. Full seed stage (R6) was highest to 35.5% for stink bug damage rate. Result of resistant genetic resources selection according to stink bug damage pod rate was lowed of best to 10.3% for "Peking, Sorogkong, Hwangsaegjunjeari and Sobaeknamulkong" in the order. Also, stink bug damage seed rate was similar too. So "Peking, Sorogkong, Hwangsaegjunjeari and Sobaeknamulkong" were thought resistant variety against stink bug. Additional study carried out with "Peking and Sorogkong" so that concretely investigate about stink bug's refuse reaction. This result showed 10.0% for Peking and 14.2% for Sorogkong at R6 stage. But, damage pod rate was rapidly lowed.

• Korean journal of applied entomology
• /
• v.55 no.4
• /
• pp.489-494
• /
• 2016

Biological control of the fungus gnat Bradysia difformis by the predatory mite Hypoaspis aculeifer was examined in hydroponic systems of strawberries in Namwon and Hapcheon varieties of Jeollabuk-do and Gyeongsangbuk-do provinces, respectively, from 2012 to 2013. The damage to strawberries caused by B. difformis was examined in seedling stages and during cultivation periods. To achieve environment-friendly management of B. difformis, 60.6 individuals of H. aculeifer were released per square-meter three and four times during cultivations periods of the Namwon and Hapcheon strawberry varieties, respectively. H. aculeifer had better control efficiency against of B. difformis than that observed with conventional cultural practices. Wilt symptoms and damage of strawberries due to B. difformis were decreased by approximately 7.4-10.4%.

• Korean journal of applied entomology
• /
• v.13 no.3 s.20
• /
• pp.135-139
• /
• 1974

A survey on rodent damage to ripening rice was conducted in Sep.-Oct. in 1973 in order to indentify the habitat type which has the greatest influence on rodent populations and damage problems. Total 109 paddies were examined in three geographical regions in central part of Korea including Kangwon and Kyoungki Provinces, which represents mountainous, coastal and rice plain lands. Sample paddies were selected according to the neighboring or surrounding habitats as farm villages, upland-crop fields, grassy river banks, forests and rice plains. Snap trapping was also conducted in each of habitats. In April, 1974, field trips were taken to representative parts of Korea visiting farmers and rural guidance officers involving more than 100 people for the information of existing local problems. The general damage of rice was considerably low in 1973 averaging $63\%$ in early ripening varieties and $0.26\%$ in standard varieties, white the average lost in 1971 was $14.2\%$ in early ripening varieties and $2.7\%$ in standard varieties. But the most of severe damages was occurred within 50 meters (practically none beyond 100m) of farm villages, caused mainly by Norway rat (Rattus rottfus Caraco) and striped field mouse (Apodemus agrarius). The examples of existing local problems confirmed that the rodent damage to field crops is closely associated with rodent populations that have survived the winter in and around farm houses and buildings.