수분부족시 대두유묘의 세포신장 특성

정병룡 대구대학교 과학기술연구소 1996 科學技術硏究 Vol.3 No.1

Plant growth is affected by water deficiency around roots. We developed a dark-grown soybean seedling system, in which water deficiency was created by transplanting from wet (high water potential = -0.01 MPa) to water-deficient (low water potential = -0.3 MPa) vermiculite. Using this system, we investigated seedling growth, cell length profile along the hypocotyl and cell wall synthesis in the elongation region during a water deficiency. Stem grew linearly after trans-planting to high water potential but stern growth is inhibited during a water deficiency. At lour water potential stem growth recovered a little 2 days after trans-planting. In contrast to stem, root grew continuously after transplanting both to high and low water potential. Cells along the hypocotyl of Day 0 seedlings elongated continuously, resulting in the maximum cell length of about 280prn 1 day after transplanting to high water potential. However, cell elongation was completely inhibited by transplanting to low water potential. If seedlings were met a condition sufficient for growth, such as rewatering or adapting to low water potential, maximum cell length was restored. Cell wall dry weight increased continuously in the elongation region at low water potential, but at the reduced rate of control, indicating that the inhibition of cell elongation responsible for stem growth at low water potential was not due to the insufficient cell wall synthesis.

화훼류 양액재배 용수의 수질문제

정병룡 한국화훼연구회 1999 '99 춘계 대농민 특별강좌 Vol.1999 No.1

Solution pH and Ion Uptake as Affected by Nitrogen Source and Cl- in Hydroponic Culture of Ageratum and Salvia

정병룡,Chiwon W. Lee 한국원예학회 2004 Horticulture, Environment, and Biotechnology Vol.45 No.2

학술공적상

정병룡 한국원예학회 2012 한국원예학회 학술발표요지 Vol.2012 No.10

외국학술행사 칼렌다

정병룡 한국원예학회 1997 원예과학기술지 Vol.2 No.3

Rhizosphere Enhances Removal of Organic Matter and Nitrogen from River Water in Floodplain Filtration

정병룡,정종배,김승현,이영득,조현종,백남주,Jeong, Byeong-Ryong,Chung, Jong-Bae,Kim, Seung-Hyun,Lee, Young-Deuk,Cho, Hyun-Jong,Baek, Nam-Joo Korean Society of Soil Science and Fertilizer 2003 한국토양비료학회지 Vol.36 No.1

하천수를 홍수터에 살포하면 퇴적층을 통과하는 동안 미생물의 작용에 의해 유기물과 질소가 동시에 제거될 수 있는데, 이러한 미생물의 작용에 미치는 근권의 효과를 홍수터 모형을 이용하여 검정하였다. 홍수터 모형은 길이와 작용에 미치는 근권의 효과를 홍수터 모형을 이용하여 검정하였다. 홍수터 모형은 길이와 직경이 각각 135 및 30 cm인 PVC관에 낙동강에서 채취한 홍수터 퇴적물을 채우고 표면에 잡초가 자라는 모형과 자라지 않는 모형으로 구분하여 제작하였다. 하천수는 $68.0L\;m^{-2}\;d^{-1}$ 유속으로 실험기간 동안 표면에 연속적으로 살포하였으며, 모형 내에서 하천수의 흐름과 미생물 반응이 정상상태(Steady state)에 도달한 이후 4주 동안 모형의 여러 깊이에서 물 시료를 채취하여 $NO_3$, $NH_4$, 용존산소, 화학적산소요구량 및 산화환원전위를 측정하였다. 표면에 잡초가 자라는 모형에서는 30 cm 깊이의 표층에서 탈질 작용이 일어날 수 있는 환원상태가 발달하였으며, 30 cm 깊이의 표층에서 탈질 작용이 일어날 수 있는 환원상태가 발달하였으며, 30 cm 깊이에서 측정된 COD와 $NO_3-N$ 농도는 유입수 중의 18.2와 $9.8mg\;L^{-1}$에 비해 각각 5.2와 $0.9mg\;L^{-1}$으로 감소하였다. $NO_3$ 제거효과는 잡초가 자라는 모형에서 현저히 높았으며, 이러한 효과는 잡초에 의한 직접적인 흡수와 근권에서의 유기물 공급과 산소의 신속한 소모에 따른 활발한 탈질작용에 기인하고, 잡초가 없는 모형에서 $NO_3$의 제거가 충분히 일어나지 못한 것은 전자수용체인 유기물의 부족 때문인 것으로 판단되었다. 이상의 결과로 미루어 볼 때 슬러지 발생과 화학약품의 사용이 필요없는 홍수터 여과 기술은 부영양상태의 하천수를 친환경적으로 처리할 수 있는 방법이 될 수 있을 것이다. If contaminated river water is sprayed over a floodplain, the microbial processes can simultaneously remove organic matter and nitrogen during the infiltration through the sediment profile. The effect of rhizosphere on the removal of organic matter and nitrogen from contaminated river water was investigated using floodplain lysimeters. River water was sprayed at a rate of $68.0L\;m^{-2}\;d^{-1}$ on the top of the lysimeters with or without weed vegetation on the surface, Concentrations of $NO_3$, $NH_4$ and dissolved oxygen (DO), and chemical oxygen demand (COD) and Eh in water were measured as functions of depth for 4 weeks after the system reached a steady state water flow and biological reactions. A significant reductive-condition for denitrification developed in the 30-cm surface profile of lysimeters with weeds. At a depth of 30 cm, COD and $NO_3$-N concentration decreased to 5.2 and $0.9mg\;L^{-1}$ from the respective influent concentrations of 18.2 and $9.8mg\;L^{-1}$. The removal of $NO_3$ in lysimeters with weeds was significantly higher than in those without weeds. Vegetation on the top was assumed to remove $NO_3$ directly by absorption and to create more favorable conditions for denitrification by supply of organic matter and rapid $O_2$ consumption, In the lysimeters without weeds, further removal of $NO_3$ was limited by the lack of an electron donor, i.e. organic matter. These results suggest that the filtration through native floodplains, which include rhizospheres of vegetation on the surface, can be effective for the treatment of contaminated river water.

저장조건에 따른 Leucaena 화분의 발아력

정병룡,박의호 대구대학교 과학기술연구소 1996 科學技術硏究 Vol.3 No.1

Leucaena is the common name for Leucaena leucocephala which is a tropical leguminous tree with a potential value as a source of wood production, high quality forage, and revegetation of hillslopes. In spite of the plant's value, both the differences of pod setting ratio among Leucaena species and the differences of flowering period limited breeding of high quality species of Leucaena plant. To overcome these problems this study was conducted to find the possibility of long term storage of Leucaena pollen by using vacuum and low temperatures. Pollen viability decreased after 1.5 days after storage at room temperature. The same trend was observed for the pollen stored at refrigerator (91℃). Pollen viability, however, was maintained longer with decreasing storage temperature to that of freezer (-17℃). Vacuum treatment also helped to maintain pollen viability either at room or refrigerator temperatures. The ratio of exploded pollen showed the same pattern as the percentage of normally germinated pollen stored under different conditions except the pollen stored at refrigerator. Average tube lengths of germinated pollens were 4.3 and 3.6 mm for the pollen stored at freezer and refrigerator with vacuum, respectively. In conclusion, the viability of Leucaena pollen could be extended by storing under vacuum at freezing temperatures.

Pendimethalin의 살포제형이 잡초방제 및 토양잔류성에 미치는 영향

정병룡 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.4

Pendimethalin is a selective herbicide, a chemical family of dinitroanilines, which is widely used for controlling annual and biennial weeds. The most widely used formulation of pendimethalin is emulsifiable concentrate (EC). Recently, formulations other than EC type, such as dispersible granule (DG) and capsule suspension (CS), have been developed to enhance safety for users by eliminate organic solvent in EC formulation. To find any differences in biological efficacies and soil persistence, the number of newly developed weed species and residual amounts after chemical application were monitored for 50 days at 10 days interval. The analytical method for pendimethalin residues was successfully validated as measured by mean recovery of 99.6±7.1% (n=6) and detection limit of 0.005 mg/kg. All of these kinds of formulations controlled efficiently most of annual weeds. However, there were no differences in weed control efficacy between three formulation types. Also there were statistically no differences in half-lives between formulations examined, indicating that DG and CS formulations could successfully substitute the classical EC formulation.

수집 나물콩의 배축신장성에 관한 연구

정병룡,정미정,이은주 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.5 No.5

Soybean sprout as a Korea-originated vegetable has been used for long time because of high nutritional value, original taste, and low price. Although soybean sprout was consumed about 12kg per person annually, researches were very rare in foreign countries and even in Korea. Thus, this study was carried out to provide the basic informations about hypocotyl elongation of soybean local lines which had used traditionally for soybean sprout in Korea. Seeds of 34 local lines and 2 varieties as control were germinated in wet vermiculite (almost 0 MPa) in the dark germinator at 25±1℃ and saturating humidity for 4 days. Hundred seed weight of most local lines was below 14g. Average hypocotyl lengths of 34 local lines were 2.6 and 9.4cm at 2 and 4 days after planting, respectively. Total length of soybean sprout varied from 14.3cm to 21.0cm at 4 days after planting and average was 18.3cm, a little bit lower than that of Eunhakong (20.Icm). However, even though soybean sprout yield varied from 496 to 867% among local lines, average yield of 34 lines (672%) at 4 days after planting was higher than those of Eunhakong (558%) and Hwangkeumkong (449%). Hypocotyl length exhibited negative correlation with seed weight (r=0.2835), indicating larger seed had shorter hypocotyl length. However, good positive correlation were observed between seed weight and soybean sprout yield (r=0.7756). This positive corrdlation indicated that small seed had higher soybean sprout yield.

한국 절화장미 산업의 역사 - 김원윤

정병룡 한국원예학회 2013 한국원예학회 기타간행물 Vol.2013 No.5