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A Study of Denitrification in the Grassland with an Acetylene Inhibition Technic
조진기,최정,박우철,Jo, Jin-Ki,Choi, Jyung,Park, Woo-Churl 한국토양비료학회 1983 한국토양비료학회지 Vol.16 No.4
본(本) 실험(實驗)은 20개소(個所)의 초지토양(草地土壤)에서 토양(土壤)을 column으로 채취(採取)하여 탈질계(脫窒系)에 아세틸렌 가스를 주입(注入) 함으로서 모든 탈질최종생성물(脫窒最終生成物)을 $N_2O$로 유도(誘導)하는 방법(方法)으로 초지(草地)에서의 탈질(脫窒)을 측정(測定)하였던 바 그 결과(結果)는 다음과 같다. 1. 탈질계(脫窒系)에 $C_2H_2$를 주입(注入)하지 않았을 경우, 대부분의 시험구(試驗區)에서 $N_2O$의 발생(發生)은 탐지(探知)되지 않았으나, $C_2H_2$를 주입(注入)함으로서 모든 탈질생성물(脫窒生成物)은 $N_2O$로 탐지(探知)되었다. 2. 탈질계(脫窒系)를 물로 포화시켰을 때는 거의 모든 구(區)에서 탈질(脫窒)이 발생(發生)했으나, 자연상태(自然狀態)의 토양(土壤)column에서는 거의 탈질(脫窒)이 일어나지 않았다. 3. 요소(尿素)를 시비(施肥)한 후 13일(日)째로부터 16일(日)째 사이의 3일간(日間) 토양(土壤)column을 배양(培養)했을 경우 각(各) 구(區)의 평균(平均) 탈질양(脫窒量)은 4.2%였으며, 최대(最大)는 14.2%였다. 4. 탈질(脫窒)과 탈질계토양(脫窒系土壤)의 화학적성질(化學的性質)과의 사이에는 거의 상관(相關)이 없는 것으로 나타났으나 이는 토양(土壤)의 화학성(化學性)을 배양(培養)이 끝난 후에 행했기 때문인 것으로 판단(判斷)했다. A field study was conducted for 20 soil columns to investigate the denitrification in the grassland with a method introducing $C_2H_2$ in the denitrifying system. Since acetylene blocked the pathway from $N_2O$ to $N_2$, all the free products of denitrification consisted of nitrous oxide. In this study, denitrification was measured as $N_2O$. Results are as follows. 1. In most of boils examined, denitrification was observed as $N_2O$ when acetylene was introduced into the denitrification system while $N_2O$ was scarcely evolved without acetylene in the system. 2. Denitrification occurred even in the grassland soils when they were saturated with water. Denitrification was nil or negligible without water saturation. 3. Denitrification loss far 3 days incubation(from 13th to 16th day after urea application) was 4.2% in average and 14.2% in maximum. 4. Soil chemical properties such as nitrate nitrogen, nitrite nitrogen, total nitrogen, total carbon and mineralizable carbon did not show clear relationships with denitrificatien, probably since soil chemical properties were analysed for the soils after incubation.
임목에 있어서 개화유도에 (開花誘導) 의한 육종싸이클의 단축 Ⅱ. 생장조절 물질 처리에 의한 자작나무와 은자작나무의 개화유도 촉진
정민섭(Min Sup Chung),조진기(Jin Ki Jo),박상진(Sang Jin Park) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.4
Betula pendula and B. platyphylla var. japonica seedlings and/or grafts growing inside and outside of a plastic-greenhouse were treated with growth regulators to induce flowering at early stages of seedling and graft developments. The seedlings began to develop female catkins visibly in eight to nine months after seeding and in five months after the first treatment of growth regulators. Thirty three percents of the seedlings grown under controlled environment in the plastic-greenhouse with sufficient nutrient supply developed female catkins both in control plants and in the plants treated with IAA, GA₃ and kinetin, while none on the control plants grown in the field showed any sign of the development of floral organs. Sixty seven percents of the seedlings treated with ABA and SADH grown in the Plastic-greenhouse developed female catkins. All the seedlings treated with 6.24 mM of SADH developed female catkins. SADH treatment to 2-5 year old seedlings and grafts of birch had a tendency of positive effect on inducing and increasing the flowering of the two birch species.
조직배양에 의한 아까시나무 ( Robinia pseudoacacia L . ) 의 개량 Ⅰ. 대량증식과 체세포배 발생
우종호(Jong Ho Woo),최명석(Myung Suk Choi),정은이(Eun Yi Joung),정원일(Won Il Chung),조진기(Jin Ki Jo),박용구(Young Goo Park) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.1
A micropropagation system for black Locust(Rohinia pseudoacacia) was established by using shoots and pin-punctured leaves of in vitro germinated seedlings. The greatest number of shoots (an average of 10.5 shoots) was obtained when shoot tips were cultured on MS medium supplemented with 1.0 ㎎/ℓ BAP and 0.01 ㎎/ℓ NAA. When pin-punctured leaf explants were cultured on the same medium, mean number of 13.E shoots were produced. Shoot growth was accelerated by adding 50 ㎎/ℓ of silver nitrate (AgNO₃), an anti-ethylere compound to the culture medium. Each shoot was excised from the mass and transferred onto half strength MS medium for rooting. Zygotic embryos at different developmental stages were cultured on LS medium supplemented with various growth regulators to induce somatic embryos. When cultured on LS medium with 1.0 ㎎/ℓ 2,4-D. 14.3% of the zygotic embryos induced somatic embryos. Upon transfer onto the basal medium, somatic embryos sporadically converted into plantlets.
Jo, Jin-Ki COLLEGE OF AGRICULTURE KYUNGPOOK NATIONAL UNIVERSI 1984 慶北大農學誌 Vol.2 No.-
This experiment was conducted to screen acid tolerant strains of Rhizobium meliloti from natural soil to grow alfalfa (Medicago sativa L.) in acid soil. The results abtained were as follows: 1. Two acid tolerant strains ot Rhizobium meliloti that could grow at liquid media of pH4.0 were screened from 67 strains isolated from naturally growing alfalfa or sweet clover (Melilotus spp.) roots. 2. Aluminum concentration of 50μM in the liquid media expressed was a severe stress for all of the acid tolerant, semi-tolerant and sensitive strains tested when media pH was low(4.5) and/or P concentration was low (10μM). 3. Tolerant and semi-tolerant strains tested could grow at low P concentration (10μM P) of pH 4.5 in liquid media.