Red sorrel (Rumex acetosella L.), as one of exotic weeds in Korea, was dominated in grassland and reduced the quality of forage. Improving current pasture productivity by precision management requires practical tools to collect site-specific pasture weed data. Recent development in unmanned aerial vehicle (UAV) technology has offered cost effective and real time applications for site-specific data collection. To map red sorrel on a hill pasture, we tested the potential use of an UAV system with digital cameras (visible and near-infrared (NIR) camera). Field measurements were conducted on grazing hill pasture at Hanwoo Improvement Office, Seosan City, Chungcheongnam-do Province, Korea on May 17, 2014. Plant samples were obtained at 20 sites. An UAV system was used to obtain aerial photos from a height of approximately 50 m (approximately 30 cm spatial resolution). Normalized digital number values of Red, Green, Blue, and NIR channels were extracted from aerial photos. Multiple linear regression analysis results showed that the correlation coefficient between Rumex content and 4 bands of UAV image was 0.96 with root mean square error of 9.3. Therefore, UAV monitoring system can be a quick and cost effective tool to obtain spatial distribution of red sorrel data for precision management of hilly grazing pasture

This study was conducted to find out the effects of Improvement of Botanical Composition Technology (IBCT) on the forage production and ecological characteristics in a Rumex acetosella-dominated hilly pasture in Pyeongchang, in a period from August 2013 to the end of growing season in October 2015. 2MT ha－1 limestone was applied in August 2013 and April 2014. Liming significantly increased soil pH from 4.69 to 5.47 and then the soil pH consistently hovered at 4.91~4.98. For every grazing time, plant height was found to be higher with the application of IBCT as compared with the control. After grazing, no significant difference in plant height was found between the IBCT group and the control. Changes in the botanical composition of grassland can be affected by a lot of circumstances, but application of IBCT decreased Rumex acetosella from 12% to 2%, while also increasing the proportion of pasture. In relation to the botanical composition of grass, orchardgrass and timothy showed the highest percentages throughout the whole study period. The proportion of Kentucky bluegrass increased over time while tall fescue steadily decreased. The totals for grazing days were 58 in 2014 and 55 in 2015. Average herbage dry matter intake was 7,848 kg ha－1 in 2014 and 6,941 kg ha－1 in 2015. Due to the application of IBCT, dry matter productivity showed a significant increase of 59% during the first grazing period in 2014 (3,437 kg ha and 5,460 kg ha in control and IBCT). In 2015, the total dry matter yield of the IBCT group was 51% greater than the control (5,742 kg ha－1 and 8,685 kg ha－1 in control and IBCT). Under acidic soil conditions, red sorrel can grow more strongly than grasses because it has better tolerance in dry and acidic conditions. Therefore, constant management is required in order to keep red sorrel from dominating the hilly pasture. In this study, the application of IBCT was able to effectively control weeds at all points. As a result, total management, including improvement of soil, overseeding, and application of selective herbicide and fertilizer, is needed to maintain excellent grassland conditions due to the limiting effects of environmental factors on grassland productivity.

산지초지에서 애기수영의 생육제어를 위한 석회와 질소의 적정 시용수준을 추정하였다. 1. 애기수영의 모든 예취회수에서 질소시용수준간과 석회시용수준간에는 유의성이 인정되었다. 2. 석회 200~300kg/10a의 수준에서 질소 21kg/10a 이상을 시용하는 것이 설정하는 것이 애기수영의 생육제어를 위하여 효과적이었다. 3. 질소 16kg/10a의 수준에서의 애기수영의 연간 건물수량이 가장 많았다. 4. 질소 48kg/10a의 수준에서 석회 520.5kg/10a을 시용할 경우, 애기수영의 완전한 생육제어가 가능한 것으로 추정되었다. 5. 석회 200~300kg/10a의 수준에서 2회 예취와 4회 예취의 생육제어효과가 가장 높았다. 6. 질소 48kg/10a의 수준의 1회 예취, 2회 예취, 4회 예취에서 생육제어효과가 가장 높았다.

애기수영의 생태적 방제를 위한 초종간 경쟁을 통하여 애기수영의 생육을 억압하여, 기초적인 자료를 얻고자 하였다. 공시초종은 reed canarygrass, kentucky bluegrass, tall fescue, orchardgrass의 4초종으로 애기수영과 종자비율을 10:0, 8:2, 6:4, 4:6, 2:8: 0:10의 6수준으로 6월 중순에 파종한 후 9월초 3엽기의 개체를 혼파비율에 맞추어 1/2000a 크기의 pot에 각각 5개체씩 이식하고

With a purpose of finding out the influences of herbicide treatment on the forage value and ecological characteristics of grassland vegetations in the Rumex acetosella dominated pasture, this trial was arranged as a randomized block design with three trea

With a purpose of finding out the influences of herbicide treatment method on the forage yield, nutrient productivity, weed control, and persistency in the Rumex acetosella dominated pasture, this trial was arranged as a randomized block design with six t