Occurrence and distribution characteristics of weed species in organic paddy fields

황기선,정성훈,김성철,정덕영,박기웅 충남대학교 농업과학연구소 2017 Korean Journal of Agricultural Science Vol.44 No.3

This study was conducted to investigate the dominance and distribution of weed species in organic and conventional paddy fields. The organic paddy fields were maintained for organic farming for more than five years in Anseong, Gyeonggi province of Korea. According to the Braun-Blanquet method, 42 and 36 weed species were found in the organic paddy fields in 2015 and 2016, respectively, while 38 and 36 weed species were found in the conventional paddy fields in 2015 and 2016, respectively. As a result of two years’ survey, 53 species from 24 families in the organic paddy fields were identified and classified as 32 annuals, 3 biennials and 18 perennials. In conventional paddy fields, 51 species from 24 families (30 annuals, 6 biennials, and 15 perennials) were identified. According to the classification by family, the most abundant weed species were Compositae (9 species), followed by Poaceae (8 species) and Polygonaceae (6 species) in organic paddy fields. In conventional paddy fields, Compositae (9 species) were the most abundant weed species, followed by Cruciferae (6 species), Poaceae, Polygonaceae, and Cyperaceae. This result indicates that the difference in diversity of weeds in paddy fields was influenced more by the agricultural environment than the type of cultivation. Our results could be used as a base data to control the occurrence of weed species in the paddy fields.

논잡초 발생양상 및 논 제초제 사용 실태조사

김창석,이인용,원태진,서영호,김은정,이순계,조승현,권오도,김상국,정완규,이정란,박태선,문병철,박재읍 한국잔디학회 2012 Weed & Turfgrass Science Vol.1 No.4

A fact-finding survey was conducted to obtain the basic information on nation-wide weed distribution and farmer's opinions to weed control strategy in paddy field. Most respondents considered Echinochloa spp., Monochloa vaginalis, Sagittaria trifolia, and Scirpus juncoides etc. as dominate weeds in paddy fields. And herbicide resistant weed species were M. vaginalis, S. juncoides, E. oryzicola and S. pygmaea etc. Purchase guidances for herbicide selection, experience of farmers was 34.0% and dealers recommendation was 33.9% at farmer's level. And paddy field herbicides application frequence were one time 15.6% but twice 75.6%. Preferred herbicides were ranked in the following order: oxadizone 12% EC, butachlor 5% GR, butachlor 33% CS, mefenacet·pyrazodulfuron-ethyl 21.42% SC, and oxadiargyl 1.7% EC etc. in paddy fields. And in most preferred foliar herbicide were bentazone·MCPA 38.6% SL and bentazone·cyhalop-butyl 18.5% ME, 48.5% and 22.3%, respectively. 논잡초의 발생상황 및 농가수준에서 논 제초제 사용을파악하여 농가지도의 기초자료로 활용코자 전국 농업인1,029명을 대상으로 논에서의 우점잡초, 선호 제초제, 논제초제의 사용방법 등을 설문조사하였다. 논에 발생하는우점잡초로는 피, 물달개비, 벗풀, 올챙이고랭이, 올방개순이었으며, 제초제 저항성잡초로 의심되는 초종은 물달개비, 논피(강피), 올미 등으로 응답하였다. 논 제초제의사용 선정은 자기 경험에 의한 것이 34.0%, 농약판매상추천이 33.9%이었다. 농가에서 한번만 제초제를 처리하는경우는 15.6%인 반면에 2회 처리하는 농가는 75.6%이었다. 농가에서 선호하는 제초제는 옥사디아존유제, 뷰타클로르입제, 뷰타클로르캡슐현탁제, 메페나셋·피라조설퓨론에틸액상수화제, 옥사디아길유제 순이었으며, 경엽처리제중에서는 벤타존·엠시피에이액제, 벤타존·사이할로포트뷰틸미탁제가 각각 48.5%, 22.3%로 농가에서 많이 사용되는 제초제이었다

과거 50년간 우리나라 논잡초 군락의 변화

이인용,김창석,이정란,박태선,문병철,박재읍 한국잔디학회 2016 Weed & Turfgrass Science Vol.5 No.1

The Rural Development Administration of Korea conducted a series of surveys of paddy weeds from 1971 to 2013 in approximately 10-year cycles and the results have been used for the efficient weed management of paddy fields. In 1971, annual weeds such as Rotala indica, Eleocharis acicularis f. longiseta, and Monochoria vaginalis were dominant. In 1981, the population of Echinochloa species decreased whereas broadleaf weeds such as M. vaginalis, Sagittaria pygmaea, and S. trifolia were dominant. In 1991, perennial weeds such as Eleocharis kuroguwai, S. pygmaea, and S. trifolia were dominant over annual weeds. In 2000, M. vaginalis was the most abundant species, followed by E. kuroguwai, Echinochloa species, and S. trifolia. In 2013, herbicide-resistant Echinochloa species and M. vaginalis were most dominant, followed by E. kuroguwai, Scirpus juncoides, and S. trifolia. It has been predicted that the prevalence of Echinochloa species will continue to increase and that perennial weeds will be more abundant than annual ones in the near future. The occurrence of herbicide-resistant weeds and exotic weeds will also increase due to global warming and changes in agricultural patterns. 농촌진흥청에서는 1971년부터 2013년까지 10년 주기로논잡초 발생 분포조사를 실시하여 논잡초의 효율적인 관리에 이용되고 있다. 1971년에는 주로 마디꽃, 쇠털골, 물달개비 등 일년생잡초가 많이 발생된 반면에, 1981년에는피의 발생이 줄어들고, 물달개비와 올미, 벗풀 등의 광엽잡초가 우점하였다. 1991년에는 일년생잡초 보다는 올방개, 올미, 벗풀 등과 같은 다년생잡초가 많았다. 2000년에는 물달개비가 가장 많이 발생되었고 그 다음으로 올방개, 피, 벗풀 등이었다. 2013년에는 제초제 저항성잡초인 피와 물달개비가 최우점하였으며, 올방개, 올챙이고랭이, 벗풀 등의 순이었다. 향후 논잡초 발생은 피의 발생량이 계속 증가할 것이고, 다년생잡초가 일년생잡초보다 발생비율이 높아질 것으로 예상된다. 또 이러한 추세는 기후변화와 재배방식 등의 농업패턴 변화로 제초제 저항성 잡초와 외래잡초의 발생이 증가될 것이다.

Development of A Five Inter-Row Type Weeding Device for A Paddy Field Robot

( Gookhwan Kim ),( Daehyun Lee ),( Myunghoon Lee ),( Gilsu Han ),( Hyundong Lee ),( Youngki Hong ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

Recently, eco-friendly agriculture has been spreading demand for safe food production in accordance with the increase of interest of people in health and environment. Manual work is the best way to remove weeds while reducing the use of herbicides, but it is time consuming and costly. This study introduced the structure and operation principle of a five inter-row type weeding device which physically removes weeds without herbicide, and tested and analyzed the performance of the device. This weeding device was covered with a polyethylene cover to prevent damage to the rice seedlings, and cutting blades were mounted in the inside of the cover to perform the weeding works. The blades were consisted of one 'L'-shaped form rotating blade and four fixed blades. The horizontal part of the rotating blade along with the fixed blade cuts weeds like scissors, and the vertical part is put into the topsoil and does a role to cut and stir the roots of weeds. The power of the weeding device is offered by the high torque through the Power Takeoff (PTO) of the robot. Since the rotating speed provided by the PTO is not enough to perform the weeding operation, the accelerator was mounted between the PTO of the robot and the rotating shaft of the weeding device to increase the rotation speed. The transmitted torque is distributed to each part of the weeding device composed of a five inter-row type through a system of pulleys and belts. An important consideration in developing a weeding device to use in a paddy field is how well the device follows the irregular and soft surface conditions like a paddy environment. To solve this problem, the weeding device was designed and manufactured with the following features. (1) A pair of rotating wheels were attached to both sides of the device so that the device could proceed stably along the irregular surface of a paddy field without sinking into the mud. (2) The weeding parts of five were connected to one rod to cope with the change of pitch angle which varies according to the state of the surface when both wheels run along the road surface of a paddy. (3) Even though both wheels run along the road surface, the roll angle is changed due to the difference in height of the both sides. To cope with this, a board-type spring and a roller-type bearing were mounted. (4) The brackets which both sides wheels are fixed are able to perform linear motion by up and down in accordance with the change in the height of the road surface together with the rod on which the devices were mounted. This weeding device was attached on the robot which can travel following rice seedlings rows in a paddy field, and performed weeding works. The result measuring the rate of weeding and the rate of rice seedlings damage, total amounts of cutting were 20.92kg, the rice seedlings were 0.22kg. The rate of the damage was just less 1.05%.

유기재배 논에서의 예방적 잡초방제를 위한 가묘상 처리 효과

이병모,지형진,조정래,안난희,옥정훈,정지희 한국잔디학회 2013 Weed & Turfgrass Science Vol.2 No.4

This study was conducted to determine the weed control effect of false seedbed in organic rice paddy field. False seedbed is one of the preventative weed control method, especially effective in upland vegetable field. False seedbed frequency and methods were examined by varying the processing time in greenhouse and fieldcondition in 2012 and 2013. In greenhouse experiment, shallow recultivation and harrow surface soil was effectiveto control weed up to 70%. Optimal processing time of false seedbed was when the weed was two or three leaf stages. Under field condition, one-time treatment of false seedbed was 61% of weed suppression rate and two-times of false seedbed treatment was 79% of weed suppression rate. Monochoria vaginalis was still troublesome weed after false seedbed treatment, but the occurrence of Echinochloa oryzoides was decreased after false seedbed treament. Results indicated that false seedbed treatment was very effective to lower early weed occurrence in rice paddy field especially Echinochloa spp. Weed control efficiency of shallow recultivation by weeder hollow and rotary tillage by tractor were 68%, 13% respectively. 논에서 예방적 방제 방법인 가묘상의 적용 가능성을 검토하고자 가묘상의 횟수와 방법, 처리시기를 달리하여 온실과 포장에서 2012년과 2013년 2년 동안 본 연구를 수행하였다. 플라스틱 박스에 논흙을 담고 가묘상 방법과 처리 시기를 조사한 바 표토를 긁어주거나 얕게 뒤엎어주는 방법 모두 70% 이상의 잡초 억제 효과를 나타냈다. 또한 너무 잡초가 어린 1.5엽기 보다는 3엽기 일때가 효과적이여서 가묘상 처리는 잡초가 2-3엽기일 때 수행하는 것이좋은 것으로 나타났다. 실제 포장조건에서의 가묘상 1회처리 시 61%의 잡초가, 2회 처리 시 79%의 잡초 억제 효과가 나타났다. 가묘상 처리에 의해 전체적인 잡초의 발생량은 줄어들었으나 물달개비는 여전히 많이 발생 하였고, 강피는 가장 많이 줄어들었다. 이에 피속 잡초가 문제되는 논에서는 적극적으로 가묘상 방법을 활용하는 것이 초기 잡초밀도를 낮추는데 효율적인 것으로 판단되었다. 가묘상 처리 방법은 중경제초기로도 68%의 억제율을 보여 충분히 가능한 방법임을 입증하였으나 트랙터를 이용하여 로타리 경운을 하는 것은 상대적으로 낮은 효과를나타냈다.

제초제 저항성 논잡초 발생동향

이인용(Lee In-Yong),박중수(Jung-Soo Park),서영호(Young-Ho Seo),김은정(Eun-Jung Kim),이순계(Sun-Gye Lee),조승현(Seng-Hyun Cho),권오도(Oh-Do Kwon),김상국(Sang-Kuk Kim),정완규(Wan-Gyu Chung),박태선(Tae-Seon Park),김창석(Chang-Seok Kim) 韓國雜草學會 2012 Weed&Turfgrass Science Vol.32 No.2

제초제 저항성 논잡초 발생면적은 농촌진흥청 국립농업과학원과 전국 8개 도 농업기술원과 공동으로 조사하였다. 8개 도 농업기술원에서 2011년 8월에 논토양을 채취하여 피라조설퓨론에틸 피리미노박메틸입제를 30kg ha-1 처리하여 설포닐우레아(SU)계 제초제 저항성 논잡초의 발생면적을 추산하였다. 전국 벼 재배면적(유기 및 친환경농업 벼 재배면적 제외)의 20.9%인 167,081ha에서 SU계 저항성 논잡초가 발생되고 있음을 확인하였다. 2008년과 대비하여 본 결과 60,130ha가 늘어났다. 발생비율을 보면, 충청남도가 논 면적의 47.6%로 제일 많이 발생되었고, 그 다음으로는 전라남도로 36.9%, 충청북도 25.7%, 강원도 20.3%, 경기도 13.0% 순이었다. 제초제 저항성 논잡초 중 발생면적이 가장 넓은 초종은 물달개비로서 65,313ha로 전체 39.1%를 차지하였으며, 그 다음으로 올챙이고랭이, 알방동사니 순이었다. 이들 3초종은 전국적으로 고르게 발생하여 제일 문제되는 잡초들이다. 그리고 미국외풀 13,964ha(8.4%), 강피 5.1%이었다. National Academy of Agricultural Science and eight province Agricultural Research & Extension Services investigated the occurring area of herbicide resistant weeds in paddy field of Korea. In order to estimate the occurring areas of herbicide resistant weeds, we collected paddy soils on August, 2011 and treated 30kg $ha^{-1}$ of pyrazosulfuron-ethyl+pyriminobac-methyl GR. 167,081ha, approximately 20.9% of cultivated area excluding organic and eco-friendly cultivated area, was estimated to be infested by SU-herbicide resistant paddy field weeds. It was increased by 60,130ha compared with investigation of 2008. It was occurred at Chungchungnam-do by 47.6%, followed by 36.9% at Jeonranam-do, 25.7% at Chungchungbuk-do, 20.5% at Gangwon do, and 13.0% at Gyeonggi-do, respectively. Monochoria vaginalis showed the highest with 65,313ha, 39.1% followed by Scirpus juncoides, and Cyperus difformis, respectively. These three species were evenly distributed and the most problematic weeds in the country. Lindernia dubia occurred at 13,964ha (8.4%) and Echinochloa oryzicola was 5.1%, respectively.

경기 남부지역 논잡초 발생분포 및 군락변화

박중수,원태진,노안성,장재은,김희동 한국잔디학회 2014 Weed & Turfgrass Science Vol.3 No.2

Survey was carried out in paddy fields to investigate the dominance of weed species and weed occurrence on 200fields of southern Gyeonggi region in Korea during the year 2013. We observed 3 species of grass, 5 species of sedge, and 11species of broadleaf and other weeds. The most dominant weed species was Eleocharis kuroguwai, followed by Echinochloacrus-galli, Sagittaria trifolia, Monochoria vaginalis, Scirpus juncoides and Bidens tripartita. The dominance value of E. kuroguwai and B. tripartita decreased compared to the survey results performed in 2005 but that of M. vaginalis, S. juncoides, S. trifolia and E. crus-galli increased. Weed occurrence increased from 2.83 g in 2005 to 3.51 g in 2013 based on weed dry weightper m2. Occurrence ratio of annual weeds to perennial weeds changed from 45.2% : 54.8% in 2005 to 45.8% : 54.2% in 2013. Ifwe analyze dominance of weed species based on the rice transplanting timing, E. kuroguwai and E. crus-galli were the mostdominant weed species at mid-May transplanting, and M. vaginalis and S. juncoides were the most dominant weed species at late-May transplanting, and M. vaginalis and E. kuroguwai were the most dominant weed species at early-June transplanting. Sincepaddy weeds resistant to sulfonylurea herbicides are expected to be continuously increased, the regular monitoring of theiroccurrence and efficient control methods should be considered in future. 2013년에 경기 남부지역 벼 재배면적 64.9천ha를 대상으로 약 325 ha당 1점씩을 기준으로 하여 200개 지점에서답유형, 이앙시기, 농업지대 등으로 구분하여 논잡초 분포를 조사한 결과는 다음과 같다. 발생 논잡초 초종은 화본과 3종, 사초과 5종, 광엽 및 기타 잡초가 11종 등 총 19종으로 2005년 17종에 비해 2종이 증가하였다. 논잡초의우점도는 올방개> 피> 벗풀> 물달개비> 올챙이고랭이>가막사리> 순이었으며, 2005년 대비 올방개(30→21%), 가막사리(10→6%)는 감소하였고, 물달개비(815%), 올챙이고랭이(2→9%), 벗풀(14→16%), 피(16→18%)는 증가하였다. m-2 당 논잡초 발생량은 2005년 2.83 g 에서 2013년에는3.51 g으로 0.68 g 증가하였다. 일년생과 다년생잡초의 생활형 비율은 2005년 각각 45.2%: 54.8%에서 2013년에는각각 45.8%: 54.2%로 나타났다. 논유형별 논잡초 발생분포는 보통답, 습답, 사질답에서 올방개, 염해답에서는 새섬매자기가 최우점 잡초로 나타났다. 이앙기별 논잡초 발생분포는 5월 중순은 올방개, 피, 5월 하순은 물달개비, 올챙이고랭이, 6월 상순은 물달개비, 올방개가 우점하였다. 경운방법별 논잡초 발생분포는 추경은 올방개, 피, 춘경은올방개, 벗풀이 우점하였으며, 농업지대별 논잡초 발생분포는 남부평야는 올방개, 피, 서부해안은 물달개비, 가막사리, 동부내륙은 올방개, 벗풀이 우점하였다. 농가의 제초제 처리횟수는 2회 이상이 96%로 2005년 62%에 비해크게 증가하였으며, 적기처리 농가는 89%로 2005년 86%에 비해 소폭 증가하였다. 앞으로 전국적으로 문제가 되고 있는 물달개비, 올챙이고랭이 등 SU계 제초제 저항성논잡초의 발생 증가가 예상되므로 주기적인 논잡초 발생모니터링과 아울러 효율적인 방제방법에 대한 연구가 필요한 것으로 생각되었다.

토양 assay를 활용한 전북지역 sulfonylurea계 제초제 저항성 논 잡초 발생 현황

최창학,조승현,이덕렬,조대호 한국잔디학회 2018 Weed & Turfgrass Science Vol.7 No.4

This study was conducted to identify a present situation of sulfonylurea herbicide resistant (HR) weeds in paddy fields in Jeollabuk-do, Korea. Paddy soil samples were collected from 241 locations and imazosulfuron + pyriminobac-methyl was applied at 10 days after irrigation. Resistant rate and area were estimated based on the number of survived weeds. Area infested by HR weeds in Jeollabuk-do was estimated to 81,494 ha (70.5%). Nine herbicide resistant species were identified, and the resistance rate was in the order of Monochoria vaginalis (52.5%), Schoenoplectiella juncoides (46.3%), Echinochloa oryzicola (37.3%), Lindernia dubia (23.0%), Echinochloa crus-galli (8.4%), Cyperus difformis (5.4%), Ludwigia prostrata (4.8%), Sagittaria trifolia (1.5%), and Rotala indica (1.3%). HR M. vaginalis, S. juncoides , L. dubia , and E. oryzicola were surveyed from all cities in Jeollabuk-do. The E. crus-galli appeared in seven cities, C. difformis and L. prostrata were identified as the HR weeds in six cities. HR R. indica and S. trifolia were occurred in only two cities. Based on the result, HR weeds in Jeollabuk-do are sharply increased in terms of occurrence rate and area compared to 2012 and 2 or 3 weed species occurred in a region or field. Therefore, major 4 HR weeds, M. vaginalis , S. juncoides , E. oryzicola , and L. dubia should be managed in all regions in Jeollabuk-do and the resistance should be checked regularly for other 5 weed species. 전라북도 지역 논에서 발생되고 있는 ALS저해제 제초제 저항성잡초의 발생 모니터링을 통하여 효율적인 논 잡초 방 제기술의 기초자료로 활용하고자 시험을 수행하여 얻어진 결과는 다음과 같다. 전북지역 14개 시·군의 논 토양조사에서 제초제 저항성잡초 발생 면적은 81,494 ha (68.9%)였다. 발생 초종은 9종이며, 발생 비율은 물달개비(52.5%), 올챙이고랭 이(46.3%), 강피(37.3%), 미국외풀(23.0%), 물피(8.4%) 순으로 나타났다. 그리고 발생 면적은 물달개비 55,139 ha, 강피 45,834 ha, 올챙이고랭이 45,383 ha, 미국외풀 26,661 ha, 물피 9,773 ha, 알방동사니 9,772 ha, 여뀌바늘 7,088 ha, 벗풀 2,119 ha, 마디꽃 975 ha였다. 제초제 저항성잡초는 전북 14개 시·군에서 고루 발생하였는데, 물달개비, 올챙이고랭이, 강피 및 미국외풀은 익산, 남원, 고창, 순창, 군산, 정읍 등 전체 전북 내 전체 시·군에서 발생하였다. 물피는 7개 시·군에서 발생하 였고, 알방동사니와 여뀌바늘은 6개 시·군에서 발생하였다. 벗풀은 군산과 임실 등 2개 시·군에서 발생하였고, 마디꽃은 부안, 임실, 무주 등 3개 시군에서 발생하였다. 전북에서 제초제 저항성 잡초 발생면적은 급격하게 증가하고 있고, 발생 종수 또한 증가하고 있다. 또한 한 지역 혹은 필지에서 발생하는 제초제 저항성 잡초는 2-3종이 동시에 발생하고 있음을 예상할 수 있었다. 따라서 전북지역에서는 각 시·군의 제초제 저항성 잡초 발생 현황을 파악하고 가능한 한 동시에 방제 할 수 있는 노력을 기울여야 할 것이다. 이를 위해 확산방지를 위한 전문 방제 약제의 추가 선발과 영농현장에서 제초제 처리의 체계적인 기술에 대한 집중 관리가 필요할 것이다.

경북지역 논 잡초 발생분포 조사

김상국,김학윤 한국잔디학회 2014 Weed & Turfgrass Science Vol.3 No.1

The survey of weed occurrence was conducted to identify problem weed species in the paddy field. The 320 sitesof the 13 regions in Gyeongbuk Province were investigated from June to July, 2013. In the whole region, 51 weed species wereidentified including 34 annuals and 17 perennials. The highest importance value of annual weed and perennial was dominant 88.4and 48.7%, in Gumi region, respectively. The most dominant weed species in paddy fields of Gyeongbuk Province wereMonochoria vaginalis var. plantaginea (10.80%), followed by Lemna paucicostata (10.74%), Bidens tripartite (8.77%),Echinochloa oryzoides (7.17%), and Scirpus juncoides (6.20%). The similarity of paddy weeds in 13 regions observed throughTWINSPAN analysis was distinguished by Ludwigia prostrata, Scirpus juncoides, Lindernia dubia, Polygonum aviculare, andAlopecurus aequalis var. amurensis. The weed species, Ludwigia prostrata, was divided into the four regions, Gyeongju,Gumi(direct seeding cultivation), Youngcheon and Euiseong and ten regions, Gumi, Bonghwa, Sanju, Goryung, Youngdeog,Pohang, Sanju, Andong, Yecheon, and Cheongdo. 본 조사는 2013년에 경북지역 13개 시·군의 320지점에서 논 잡초 발생 현황을 파악하기 위하여 수행되었다. 경북지역의 논잡초 조사결과, 27개과(family) 51초종(species)이었고 과별로는 벼과(family) 9초종, 사초과(family) 5초종, 마디풀과(family) 4초종, 국화과(family) 4초종 순으로나타났다. 발생 잡초종의 생활형태는 일년생잡초 34종, 다년생잡초 17종으로 대부분 일년생잡초였다. 경북지역의 우점잡초는 물달개비(10.80%) >좀개구리밥(10.74%) >가막사리(8.77%) >강피(7.17%) >올챙이고랭이(6.20%) >올방개(6.13%) >벗풀(5.85%) 순이었다. 물달개비, 좀개구리밥,가막사리, 강피, 올챙이고랭이, 올방개, 벗풀의 우점도는전체 잡초종의 50%이상 차지하였고 TWINSPAN 분석을통한 지역별 잡초종의 유사성은 여뀌바늘, 올챙이고랭이,미국외풀, 마디풀, 뚝새풀에 의해 구분되어 추후 경북지역논 잡초의 발생 양상을 예측하며 잡초군락의 변화를 파악함으로써 체계적인 논 잡초 관리방안을 마련할 수 있을것으로 판단되었다.

충남지역 논 잡초 발생분포조사

황기선,원옥재,박수혁,엄민용,한성민,서수정,이인용,이증주,박기웅 한국잔디학회 2013 Weed & Turfgrass Science Vol.2 No.4

The survey of weed occurrence was conducted to identify problematic weed species on the paddy field. Total 524 sites of the 17 regions in Chungnam Province in Korea were investigated from June to August, 2013. In the whole region, 23 weed species were identified including 19 annuals and 4 perennials. The most dominant weed species in Chungnam paddy fields were Echinochloa crus-galli (25.3%), followed by Monochoria vaginalis (11.9%), Eleocharis kuroguwai (10.3%), Bidens tripartite (9.3%) and Aneilema japonicum (8.5%). The 95.2% of the investigation sites was determined under dominance value 1 (range of cover <10: numerous individuals) by Braun-Branquet indicating proper weed control in the paddy fields. This information could be useful for estimation of future weed occurrence, weed population dynamics and establishment of weed control methods in Chungnam Province in Korea. 본 조사는 2013년에 충남지역 17개 시·군의 524지점에서 논 잡초 발생현황을 파악하기 위하여 수행되었다. 충남 전 지역 논 잡초 조사결과, 23초종이 조사되었다. 그 중 일년생 잡초가 19종, 다년생 잡초가 4종으로 나타났다. 물피의 발생비율이 25.25%로 가장 우점하였고, 물달개비 11.87%,올방개 9.27%, 사마귀풀 8.47% 순으로 나타났다. Braun- Branquet에 의한 우점도 평가에 의하면 조사대상지의 95.2%가 우점도 1(개체수는 많지만 피도가 10%이하로 출현)이하로 적절한 잡초방제가 이루어진 것으로 조사되었다. 이번 연구결과를 이용하여 앞으로 충남지역 논 잡초의 발생 양상을 예측하며 잡초군락의 변화를 파악함으로써 체계적인 논 잡초 관리방안을 마련할 수 있을 것으로 판단된다