• Journal of Ginseng Research
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• 제20권1호
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• pp.101-105
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• 1996

Several attempts have been made to protect crops against injury from herbicide quinclorac residue in soil. In this experiment, a selection of suitable crops for bioassay of the residue and a reduction of phytotoxicity by treatment with active carbon were carried out to prevent or to counteract the phytotoxicity. Cucumber (Cuumts satims) and kidney bean (Phaseolus Mgaris) were the suitable indicator plant in points of a sensitivity to the herbicide residue and an easy cultivation. The phytotoxicity was able to be observed at 20 and 30 days after seeding on kidney bean and cucumber respectively. In pot trials, application of the active carbon at 50 kg/10a protected effectively the 2-year-old ginseng plant from the injury in a paddy soil where the herbicide had been treated at 3 g a. i./10a.

• 한국초지조사료학회지
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• 제11권3호
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• pp.162-168
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• 1991

Iterbicide resduc. cauicd ~rljul-y to ovcrsown pasture grasses \\hen herbicide appliccl for use in pasturc est;~blish~nt~nt lo gro~vth contro! ol n;rtivc ~r ~:cds and shrubs. 'l'hih L~sperirnel~t was conducted to cv;lluati. (he herbicidr residue anti its ph!:totosical ~riiiuence on the growth of introtluccd pasturts species. Esperimcmtal soils was treated with buthitlazolc, ~ o d l ~ l m chlorate, glyphosatc. U-46 anti paraquat each at twt) applici~tion rates. Lhcf~1i.s glowl~mlc~ including othrr pasture grasses and le~urnes were evaluatrd for tolerance to herbicide. IIerbicide residue in the amount ot injury caused to introduced pasture grasses was found in order of buthidazole, sodium chlorate, U-46 and glyphosate. Euthidazole was not available for use in pasture establishment because of their long persist of toxic herbicide residues. A great stand redl~ction of subseq ~ ~ c n t oversown pastures was also observed In sodium chlorate treatment. However, normal vegetative stand and grass production was obtained, when thc pasture grasses seeded 45-60 days later herbicide treatments. Glyphosate did not affect subsequent oversown pasture species in both grasses and legumes. fistuccr arundinc~cea and Pou pratensis were the most tolerant pasture species to herbicide residue while 7'rzfi,lium pyatense and Medicugo suti~u showed a wsceptible response regardless of herbicide.

• 한국초지조사료학회지
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• 제18권2호
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• pp.107-112
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• 1998

This experiment was carried out to investigate effects of herbicide application method on Abutilon avicennae control and corn yield at the forage experimental field, grassland and forage crop division, National Livestock Research Institute, RDA, Suwon from 1996 to 1997. The experiment was arranged in a randomized block design with three replication. The herbicide application consisted of control, 2-3 leaf stage(Dicamba), 5-6 leaf stage (Dicamba) and soil treatment(Pendimetha1in). The hybrid of corn used in this experiment was P 3352. The results obtained are summarized as follow; 1. The plant and ear height was the lowest at control. Tasseling and silking date were delayed 3-4 day at control. The length and weight of ear were the highest at Dicamba treatment in 2-3 leaf stage. 2. The herbicide injury of corn was detected slightly after 10-20 day but the injury was recovered soon. The weed control efficiency was 96.7 and 81.8% at Dicamba treatment in 2-3 and 5-6 leaf stage, respectively. 3. The fresh and dry matter yield of Dicamba treatment in 2-3 leaf stage was higher than that of control by 36%, but no significant difference was found among herbicide application method. 4. Herbicide application method had little effect on the ADF, NDF and CP contents, but the CP and IVDMD of ear were higher than that of stover. The results of this experiment indicate that the application of Dicarnba in 2-6 leaf stage of corn will remove almost all of A butilon avicennae and increase DM yield of corn.

• 한국잡초학회지
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• 제13권4호
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• pp.210-233
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• 1993

The herbicide has become indispensable as much as nitrogen fertilizer in Korean agriculture from 1970 onwards. It is estimated that in 1991 more than 40 herbicides were registered for rice crop and treated to an area 1.41 times the rice acreage ; more than 30 herbicides were registered for field crops and treated to 89% of the crop area ; the treatment acreage of 3 non-selective foliar-applied herbicides reached 2,555 thousand hectares. During the last 25 years herbicides have benefited the Korean farmers substantially in labor, cost and time of farming. Any herbicide which causes crop injury in ordinary uses is not allowed to register in most country. Herbicides, however, can cause crop injury more or less when they are misused, abused or used under adverse environments. The herbicide use more than 100% of crop acreage means an increased probability of which herbicides are used wrong or under adverse situation. This is true as evidenced by that about 25% of farmers have experienced the herbicide caused crop injury more than once during last 10 years on authors' nationwide surveys in 1992 and 1993 ; one-half of the injury incidences were with crop yield loss greater than 10%. Crop injury caused by herbicide had not occurred to a serious extent in the 1960s when the herbicides fewer than 5 were used by farmers to the field less than 12% of total acreage. Farmers ascribed about 53% of the herbicidal injury incidences at their fields to their misuses such as overdose, careless or improper application, off-time application or wrong choice of the herbicide, etc. While 47% of the incidences were mainly due to adverse natural conditions. Such misuses can be reduced to a minimum through enhanced education/extension services for right uses and, although undesirable, increased farmers' experiences of phytotoxicity. The most difficult primary problem arises from lack of countermeasures for farmers to cope with various adverse environmental conditions. At present almost all the herbicides have"Do not use!" instructions on label to avoid crop injury under adverse environments. These "Do not use!" situations Include sandy, highly percolating, or infertile soils, cool water gushing paddy, poorly draining paddy, terraced paddy, too wet or dry soils, days of abnormally cool or high air temperature, etc. Meanwhile, the cultivated lands are under poor conditions : the average organic matter content ranges 2.5 to 2.8% in paddy soil and 2.0 to 2.6% in upland soil ; the canon exchange capacity ranges 8 to 12 m.e. ; approximately 43% of paddy and 56% of upland are of sandy to sandy gravel soil ; only 42% of paddy and 16% of upland fields are on flat land. The present situation would mean that about 40 to 50% of soil applied herbicides are used on the field where the label instructs "Do not use!". Yet no positive effort has been made for 25 years long by government or companies to develop countermeasures. It is a really sophisticated social problem. In the 1960s and 1970s a subside program to incoporate hillside red clayish soil into sandy paddy as well as campaign for increased application of compost to the field had been operating. Yet majority of the sandy soils remains sandy and the program and campaign had been stopped. With regard to this sandy soil problem the authors have developed a method of "split application of a herbicide onto sandy soil field". A model case study has been carried out with success and is introduced with key procedure in this paper. Climate is variable in its nature. Among the climatic components sudden fall or rise in temperature is hardly avoidable for a crop plant. Our spring air temperature fluctuates so much ; for example, the daily mean air temperature of Inchon city varied from 6.31 to $16.81^{\circ}C$ on April 20, early seeding time of crops, within${\times}$2Sd range of 30 year records. Seeding early in season means an increased liability to phytotoxicity, and this will be more evident in direct water-seeding of rice. About 20% of farmers depend on the cold underground-water pumped for rice irrigation. If the well is deep over 70m, the fresh water may be about $10^{\circ}C$ cold. The water should be warmed to about $20^{\circ}C$ before irrigation. This is not so practiced well by farmers. In addition to the forementioned adverse conditions there exist many other aspects to be amended. Among them the worst for liquid spray type herbicides is almost total lacking in proper knowledge of nozzle types and concern with even spray by the administrative, rural extension officers, company and farmers. Even not available in the market are the nozzles and sprayers appropriate for herbicides spray. Most people perceive all the pesticide sprayers same and concern much with the speed and easiness of spray, not with correct spray. There exist many points to be improved to minimize herbicidal phytotoxicity in Korea and many ways to achieve the goal. First of all it is suggested that 1) the present evaluation of a new herbicide at standard and double doses in registration trials is to be an evaluation for standard, double and triple doses to exploit the response slope in making decision for approval and recommendation of different dose for different situation on label, 2) the government is to recognize the facts and nature of the present problem to correct the present misperceptions and to develop an appropriate national program for improvement of soil conditions, spray equipment, extention manpower and services, 3) the researchers are to enhance researches on the countermeasures and 4) the herbicide makers/dealers are to correct their misperceptions and policy for sales, to develop database on the detailed use conditions of consumer one by one and to serve the consumers with direct counsel based on the database.

• 한국잡초학회지
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• 제12권3호
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• pp.261-270
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• 1992

Many herbicides that are applied at the soil before weed emergence inhibit plant growth soon after weed germination occurs. Plant growth has been known as an irreversible increase in size as a result of the processes of cell divison and cell enlargement. Herbicides can influence primary growth in which most new plant tissues emerges from meristmatic region by affecting either or both of these processes. Herbicides which have sites of action during interphase($G_1$, S, $G_2$) of cell cycle and cause a subsequent reduction in the observed frequency of mitotic figures can be classified as an inhibitor of mitotic entry. Those herbicides that affect the mitotic sequence(mitosis) by influencing the development of the spindle apparatus or by influencing new cell plate formation should be classified as causing disruption of the mitotic sequence. Sulfonylureas, imidazolinones, chloroacetamides and some others inhibit plant growth by inhibiting the entry of cell into mitosis. The carbamate herbicides asulam, carbetamide, chlorpropham and propham etc. reported to disrupt the mitotic sequence, especially affecting on spindle function, and the dinitroaniline herbicides trifluralin, nitralin, pendimethalin, dinitramine and oryzalin etc. reported to disrupt the mitotic sequence, particularly causing disappearence of microtubles from treated cells due to inhibition of polymerization process. An inhibition of cell enlargement can be made by membrane demage, metabolic changes within cells, or changes in processes necessary for cell yielding. Several herbicides such as diallate, triallate, alachlor, metolachlor and EPTC etc. reported to inhibit cell enlargement, while 2, 4-D has been known to disrupt cell enlargement. One potential danger inherent in the use of soil acting herbicides is that build-up of residues could occur from year to year. In practice, the sort of build-up that would be disastrous is unikely to occur for substances applied at the correct soil concentration. Crop injury caused by soil applied herbicides can be minimized by (1) following the guidance of safe use of herbicides, particularly correct dose at correct time in right crop, (2) by use of safeners which protect crops against injury without protecting any weed ; interactions between herbicides and safeners(antagonists) at target sites do occur probably from the following mechanisms (1) competition for binding site, (2) circumvention of the target site, and (3) compensation of target site, and another mechanism of safener action can be explained by enhancement of glutathione and glutathione related enzyme activity as shown in the protection of rice from pretilachlor injury by safener fenclorim, (3) development of herbicide resistant crops ; development of herbicide-resistant weed biotypes can be explained by either gene pool theory or selection theory which are two most accepted explanations, and on this basis it is likely to develop herbicide-resistant crops of commercial use. Carry-over problems do occur following repeated use of the same herbicide in an extended period of monocropping, and by errors in initial application which lead to accidental and irregular overdosing, and by climatic influence on rates of loss. These problems are usually related to the marked sensitivity of the particular crops to the specific herbicide residues, e.g. wheat/pronamide, barley/napropamid, sugarbeet/ chlorsulfuron, quinclorac/tomato. Relatively-short-residual product, succeeding culture of insensitive crop to specific herbicide, and greater reliance on postemergence herbicide treatments should be alternatives for farmer practices to prevent these problems.

• 한국초지조사료학회지
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• 제19권3호
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• pp.259-264
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• 1999

본 시험은 메꽃(Calystegia japonica) 발생이 심한 사일리지용 옥수수 포장에서 제초제 처리수준에 따른 메꽃의 방제효과를 조사하여 적정 제초제 시용수준을 구명하고자, 방치구(대조구)와 dicamba 액제수준 ($0.75{\ell},\;1.0{\ell},\;1.25{\ell},\;1.5{\ell},\;2.0{\ell}$)를 달리한 6처리를 두고 1995년도에 수원 축산기술연구소에서 실시되었다. 공시 사일리지용 옥수수 품종은 DK729였으며, dicamba 액제는 옥수수 4~5엽기때 경엽 처리하였다. 방치구의 옥수수 생육은 잡초와의 경합으로 저조하였으며, 제초제 처리구에 비해 출수기와 출사기가 1~4일 정도 늦었다. 메꽃 방제효과는 dicamba 액제처리시 74.3~94.6% 범위였으며, 제초제 처리수준간에는 뚜렷한 차이는 없었다. Dicamba 액제 $1.25{\ell}$ 이상 처리구에서 옥수수의 생육초기에 약해가 관찰되었으나 생육에 큰 영향을 미칠 정도는 아니었으며, $2.0{\ell}$ 처리구는 약해를 가장 많이 받은 것으로 나타났다. 건물수량, 암이삭의 길이와 비율 등은 dicamba 액제 처리구에서 양호하여 방치구의 건물수량(4,866ka/ha)은 제초제 처리구(14,960~16,340kg)의 30% 수준에 불과하였으며(P<0.05), dicamba 액제 처리수준간 유의적인 수량차이는 없었으나 $1.5{\ell}$와 $2.0{\ell}$ 처리구에서 수량은 다소 낮은 경향이었다. 건물수량중 암이삭이 차지하는 비율은 방치구에서는 21.6%로 낮았으나 제초제 처리구는 33.6~39.4% 범위였다. 제초제 처리구에서 방치구에 비해 옥수수 경엽의 조단백질과 NFE 함량은 높은 경향이었으며, 조섬유함량은 낮아 잡초 방제로 사료가치 개선효과가 있었다. 그러나 암이삭에서는 제초제 처리에 의한 사료가치 차이는 나타나지 않았다. 이상의 결과로서 메꽃 발생 옥수수 포장에서 메꽃의 효율적 제거를 위해서는 dicamba 액제 처리가 바람직하며, 옥수수에 대한 약해 없이 높은 방제효과를 기대할 수 있는 적정 dicamba 액제 처리수준은 ha당 $0.75{\sim}1.0{\ell}$ 였다.

• 한국초지조사료학회지
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• 제18권3호
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• pp.217-222
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• 1998

This experiment was carried out to investigate effects of herbicide application method on Calysteria jcqoonica control and corn yield at the forage experimental field, grassland and forage crops division, National Livestock Research Institute, RDA, Suwon from 1996 to 1997. The experiment was arranged in a randomized block design with three replication. The herbicide application consisted of control, 2~3 leaf stage(Dicamba), 5~6 leaf stage(Dicamba) and soil treatment (Pendimethalin). The hybrid of corn used in this experiment was P 3352. The results obtained are summarized as follow; 1. The plant height was the lowest at control and the highest at Dicamba treatment in 5~6 leaf stage, but no significant difference was found among herbicide application method at ear height. Tasseling and silking date were delayed 2~3 day at control. The length and weight of ear were highest at Dicamba treatment in 2~3 leaf stage. 2. The herbicide injury of corn was very slightly after 10-20 day, but corn was recovered soon. The weed control value was 94.2~67.5% at herbicide application plot. 3. The fresh and dry matter yield of Dicamba treatment in 2-3 leaf stage was highest as 42,878 and 16,033kg/ha, respectively. The application of Dicamba increased the DM yield of corn by 13~30%. 4. Herbicide application time had little effect on the ADF, NDF and CP contents, but the forage quality of ear was higher than that of stover. The result of this experiment indicate that the application of Dicamba in 2~6 leaf stage of corn will remove almost all of Calysreria jqonica and increase DM yield of com.

• Weed & Turfgrass Science
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• 제2권3호
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• pp.221-229
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• 2013

우리나라에서 제초제 저항성작물의 개발과 저항성작물의 실용화 재배가 이루어질 경우를 대비하기 위하여 제초제 저항성작물 개발 및 잡초방제 연구현황을 분석하고 앞으로의 잡초방제 방향과 전망에 관하여 기술하였다. 제초제 저항성작물 개발은 작물에 대한 약해 없이 한 가지 제초제만을 사용해서 선택적으로 광범한 잡초방제 효과를 나타낼 수 있는 획기적인 잡초관리 기술의 하나이다. Glyphosate 저항성 형질전환 콩, 옥수수, 캐놀라, 면화에서 glyphosate 사용은 단순한 잡초방제법으로 저비용으로 편리하게 잡초를 관리할 수 있다. 한 작물에 glyphosate와 glufosinate에 모두 저항성인 이중저항성작물은 옥수수, 콩, 면화에서 개발되어 glyphosate 저항성잡초를 방제할 수 있었으며, 기존 제초제 기술의 영역을 확장할 수 있을 것이다. 그리고 glyphosate를 ALS 저해형 제초제, 합성옥신 제초제, HPPD 저해형 제초제 혹은 ACCase 저해형 제초제를 포함한 새로운 제초제 저항성작물 개발은 제초제 저항성잡초를 효과적으로 방제하기 위하여 가까운 장래에 개발되기를 기대한다. 또한 제초제 저항성작물만으로는 잡초문제를 해결할 수 없기 때문에 앞으로 다른 작용기작 제초제의 교호사용, 기계적, 경종적 방법을 통합한 종합적잡초관리 체계에 관한 연구가 요망된다.

• Weed & Turfgrass Science
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• 제3권4호
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• pp.323-328
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• 2014

본 연구는 벼 재배에서 병해충방제의 목적으로 확대 보급되고 있는 농업용 무인헬기를 담수표면산파의 잡초방제에 활용 가능성을 검정하고자 수행하였다. 경엽처리 제초제(bentazone sodium + fenoxaprop-P-ethyl)의 처리농도는 벼 병해충방제에 적용하는 8배로 희석하여 처리한 결과 기준량 및 2배량 살포에서는 피해가 크지 않았으나, 3배량 이상 살포시 벼 생존율이 급격히 감소하였다. 벼 담수표면산파 포장에 발생한 주요 잡초는 피(Echinochloa crus-galli)를 포함한 일년생 6초종과 너도방동사니 등 다년생 2초종이었으며, 파종 후 25일에 무인헬기로 경엽처리 제초제 살포시 일년생 잡초에서 96.3%, 다년생 잡초 99.8%로 동력분무기를 이용한 관행방제와 유사한 방제가를 보였고, 약해 증상도 나타나지 않았다. 제초제 살포시기 설정을 위하여 파종 후 15일, 20일, 25일에 무인헬기로 살포한 결과 파종 후 15일에 방제가가 일년생 잡초 98.5%, 다년생 잡초 100%로 관행방제(1년생 97.3%, 다년생 99.6%)보다 높았고, 약해 증상도 나타나지 않았다. 따라서 농업용 무인헬기를 경엽처리 제초제 살포에 이용 가능할 것으로 판단된다.

• Journal of Ginseng Research
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• 제14권2호
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• pp.291-296
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• 1990

Various rates of 2,4-D were sprayed on 2 and 3 year old ginseng plants as foliar spray to define the critical concentration. No apparent plant injury was noticable for those ginseng plants when application concentration of 2,4-D doubled the recommended dosage (70 ml/10a). Neither abnormal foliar change occurred nor any inhibition in leaf and stem growth was resulted for the plants treated with 2,4-D concentrated two times of the recommended dosage. When the rates of 2,4-D application were increased greater than this level, injury ratings increased linearly with the rates of 2,4-D application and plant you was inhibited. Ethylene gas was not produced from the ginseng plant treated with 2 times concentrated 2,4-D, however the ginseng plants produced 0.03 to 0.09 ppm ethylene gas when the rate of application were increased 3 and 4 times, respectively. On the other hand the soybean treated with the recommended amount of 21-D produced ethylene gas of 10-20 times higher compared with ginseng plants and died. Photosynthesis ability of the ginseng leaf was significantly decreased by 2,4-D foliar application but it was recovered 4 weeks after 2,4-D foliar treatment. The herbicide 2,4-D was applicated to 2,3 and 4 years old ginseng plants as foliar spray with the rates of 0.5, 1.0, 1.5 and 2.0 times of the recommended dosage to define the effects of 2,4-D on the plant growth and root yield of the ginseng. There were no significant differences in the leaf and stem growth between untreated and 2,4-D treated plant. Berry maturing of 3 and 4 year old ginseng was not influenced by 2,4-D. The root weight of 4 years old ginseng plant was not reduced by application of 2,4-D concenrated 2 times of the recommended dosage, Application time of the herbicide 2,4-D had no effects on the leaf or stem growth of 2,3 and 4 year old year old ginseng plants. When the ginseng seedling was treated with 2,4-D, detrimental phenomena as stem bending and docoration of seedling leaf margin occurred, but stem bending was recovered in a few day s. Keywords Panax ginseng C.A. Meyer, 2,4-D , herbicide.