• 생명과학회지
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• 제15권1호
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• pp.132-135
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• 2005

가지 육종을 위한 기초 자료를 얻고자 9품종을 교잡하여 $F_l$ 세대의 11개 조합을 재료로 각 형질들의 측정치로서 우성의 정도와 잡종강세를 평가하였다. $F_l$세대의 잡종강세는 초장, 경경, 과중, 엽장, 엽폭, 주당과수 등이 초우성으로 유전되었다. 그리고 과장과 과경은 불완전 우성으로 유전되었다. Heterosis의 정도는 초장, 경경, 과중, 과장, 과경, 엽장, 엽폭, 주당과수 등 8개 형질 모두에서 정(+)의 강세를 보였다. Heterobeltiosis의 정도는 초장만이 정(+)의 강세를 보였고, 과경, 엽폭, 엽장, 과중, 주당과수, 과장, 경경은 부(-)의 잡종강세를 보였다

• 한국산림과학회지
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• 제94권5호통권162호
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• pp.313-320
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• 2005

This study was performed in a 38-year-old Mongolian pine (Pinus sylvestris L. var. mongolica Litvin) plantation in northeast China. Data were collected from 5 sample trees with different canopy position ranging in DBH from 14.6 cm to 23.8 cm. Sawn speciments that included the biggest knot were taken from the stem below the living crown. Number and distribution of knots per whorl below the living crown were studied by relative height below living crown (RHBC). A linear model expressed as function of whorl age (AGE), whorl height ($H_k$) and the stem diameter at which the whorl was located ($D_k$) was developed to predict the knot diameter and angle. The number of annual rings in four periods and the width of respective zone alone stem were used as dependant variables to analyze the knot develop phases. In average, the number of years from branch birth to ceased forming rings was 7.8, the branches remained alive for 4.2 years without forming annual rings, and branches were occluded 14.4 years after their death. These results can provide abundance branch and knot information so as to describe current and past tree growth dynamic of Mongolian pine plantation.

• 한국산림과학회지
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• 제69권1호
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• pp.6-12
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• 1985

수간석해(樹幹析解)를 위한 계산시간(計算時間)을 크게 단축(短縮)시키면서 정확(正確)한 계산결과(計算結果)를 얻을 수 있는 전산화(電算化)프로그램을 BASIC어(語)로 개발(開發)하였다. 원판측정자료(圓板測定資料) 등은 사용자(使用者) 자신이 전산기(電算機)에 직접 입력(入力)시킬 수 있도록 하였으며, 자료목록(資料目錄), 단면적(斷面績), 령급별(齡級別) 수고(樹高), 각종 성장량(成長量)과 성장률(成長率) 등이 출력(出力)되도록 하였다. 이 때, 통나무 재적(材積)은 Huber식(式)에 의하여 계산(計算)하였으며 성장률(成長率)은 Pressler식(式)에 의하여 계산(計算)하였다. 본(本) 프로그램의 목록(目錄)은 부록(附錄) I과 같다.

• 한국작물학회지
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• 제36권3호
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• pp.259-265
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• 1991

시비법과 생장조정제등의 여러가지 재배방법을 강구하여 참깨의 단경화와 수량성의 변화를 구명하였던 결과를 요약하면 다응과 같다. 1. 단경화의 효과적인 방법은 참깨의 출현후50일에 적심함으로서 10cm의 주경단축을 가져왔고 그 다음으로 B-9생장조정제의 엽면살포가 8cm, 다찌가랜 엽면살포가 6cm의 단경화에 기대되는 방법이었다. 2. 종실수량에 관여한 수량구성요소들은 주당삭수 주당입수, 상단부위 및 중단부위 삭내 등숙율 등 이었고 특히 상단부위의 삭내 등숙율은 종실수량과 밀접한 관계가 있었다. 3. 퇴비의 증시는 단경화의 효과는 없었으나 주당삭수, 주당입수 및 상단부위 삭내 등숙율을 향상시켜 12%의 증수효과를 가져왔다 4. 다찌가랜의 엽면산포는 6cm의 단경화는 물른 주당삭수, 주당입수 및 상단부위의 삭내 등숙율의 향상에 의한 8%의 증수효과를 가져 왔으며 특히 건근중비를 높여 도복에 의한 근의 발취현상이 최소화될 것으로 기대된다.

• 임산에너지
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• 제2권2호
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• pp.1-12
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• 1982

To study tile comparison of aboveground biomass of Pinus rigida Mill. of 18-year-old, plantations located in Whaseong, Yuseong and Wanju district were selected. Ten sample trees in each district selected taking account of DBH distribution were felled carefully to minimize loss of branches and stem analysed by 1m lag segment sectioned from base . The tree height and DBH were measured for sample trees in total growing within $200m^2$ experimental plot. The diagram of oven-dry weight distribution of stem, branch and needle for each 1m segment was constructed. The logarithmic regression equations between dry weight of each component and the two variables, $DBH^2$ and tree height, combined term were presented. The standing crops in the sample stand was estimated to be as much as 23.88, 54.09 and 42.68 tons of dry matter, above ground , per ha in Whaseong, Yuseong anf Wanju district respectively. Annual net production was estimated at 253,657 and 3.65 tons per ha per year respectively. The net assimilation rate was 1.65,1.95 and 1.81 kg/kg/yr in Whaseong, Yuseong and Wanju district respectively. The efficency of leaf to produce stem was 0.99, 1.12 and 1.30 kg/kg/yr respectively.

• 농업생명과학연구
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• 제50권5호
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• pp.1-9
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• 2016

Plant growth and development strongly influenced by light quantity and its spectral composition. Young tomato plants were cultivated in growth cabinets under artificial light provided by red and blue light emitting diodes(LEDs) during 12 hours, then plants were exposed to monochromatic ultraviolet, blue, green and red lights as an end-of-day(EOD) treatment during 4 hours to study their effect on plant growth parameters. EOD lighting from various LEDs increased total fresh and dry weights as well as assimilation area compared to those in control. Blue light increased stem height, internode length and stem diameter. Monochromatic UV-A light reduced stem elongation, highly increased stomatal conductance. Compactness and health index of young tomato plants were increased in UV-A and red light treatments.

• 한국산림과학회지
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• 제34권1호
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• pp.21-30
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• 1977

일본잎갈나무는 우리나라의 주요조림수종(主要造林樹種)으로 전국각지(全國各地)에 많은 조림지(造林地)와 임분(林分)이 있다. 이 수종(樹種)의 임분밀도관리(林分密度管理)의 지침(指針)을 마련하여 생산력예측(生產力豫則), 간벌계획(間伐計劃)과 수확량(收穫量) 사정(査定)을 용이하게 하는 일은 임업기술(林業技術)의 계량적(計量的), 생태적(生態的) 및 경제적(經濟的) 관점(觀點)에 대단(大端)이 의의있는 일로 생각 되었다. 이 연구(硏究)를 위해 정상적(正常的)으로 관리(管理)되고 있든 비정상적(非正常的)으로 관리(管理)되고 있든 최근(最近)에 간벌(間伐)한 흔적이 없는 임분(林分)에서 165개(個)의 표본(標本)을 조사(調査)하여 평균수고(平均樹高), 평균직경(平均直徑) 우세목수고(優勢木樹高), ha당(當) 본수(本數)와 1평균목(平均木)의 간재적(幹材積)을 산출(算出) 하였다. 이 연구(硏究)에 특(特)히 세장도이론(細長度理論)을 새로 도입(導入) 하였다. 이 이론(理論)에 대(對)한 실험적(實驗的) 검토(檢討)는 마(馬)와 Wardle, Shantz, Harms & Colline의 밀도시험결과(密度試驗結果)를 인용(引用)하여 증명한 바 있다. 임목(林木)의 상대생장(相對生長)은 일반적(一般的)인 logistic cnrve를 인용(引用)하고 공식(公式)은 모두 $Y=a{\times}b$를 대입(代入) 하였다. 각측정인자간(各測定因子間)의 관계(關係)는 아래와 같았다. 1. 세장도별(細長度別) 수고(樹高)와 밀고(密度)와의 관계(關係)-표(表) 1과 그림2 2. 세장도별(細長度別) 직경(直徑)과 밀도(密度)와의 관계(關係)-표(表) 1과 그림3 3. 세장도별(細長度別) 수고(樹高)와 단목간재적(單木幹材積)과의 관계(關係)-표(表) 3과 그림4 4. $D^2H$와 단목(單木) 간재적(幹材積)-$Log_eV=0.9569\;Log_eD^2H-9.8431$ 5. 밀도(密度)와 간재적(幹材積)-$Log_eV=9.5026-1.6800\;Log_eD$ 6. 밀도(密度)와 간재적(幹材積)-$Log_eV_{ha}=9.4911-0.6784\;Log_eD$ 7. 세장도별(細長度別) 수고계급(首告階級)에 응대(應對)한 간재적(幹材積)-표(表) 5 8. 세장도별(細長度別) 수고계급(首告階級)에 응대(應對)한 Ha당(當) 본수(本數)-표(表) 6 9. 세장도별(細長度別) 수고계급(首告階級)에 응대(應對)한 Ha당(當) 간재적(幹材積)-표(表) 7 이상(以上)의 과정(過程)을 거쳐 일본잎갈나무 임분밀도관리도표(林分密度管理圖表)를 제작(製作)하였다(그림 9). 이 관리표(管理表)의 정확도(正確度)를 검정하기 위하여 실측치(實測値)와 추정치(推定値)와의 관계(關係)를 보니 표(表) 8의 내용과 같이 오차(誤差)가 낮은편이었다. 이 도표(圖表)는 일본잎갈나무 임분(林分)의 밀도관리(密度管理)의 지침(指針)이 되리라 생각 된다.

• Journal of Plant Biology
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• 제13권1호
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• pp.47-55
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• 1970

In order to approach a reasonable method for the indirect estimation of the productivity in terrestrial plants, allometric method was studied with herbs, such as Boenmeria frutescens and Hibiscus mutabilis, and scrubs, such as Robinia pseud oacacia and Morus alba f. Hchiroe. Allometric relations between D230H, square of the stem(or shoot) diameter(D30) on 30cm height above ground multiplied by stem length(H), and the amount of the stem(Ws), orof the leaves per stem, were fitted to each material plant with linear regression. The allometric coefficient in relation of D230H to Ws was approximated between scrubs having different life form, and the allometric function in relation of DF2 to WL was common between herbs in spite of having different growth habitat. As the allometries between D230H and Ws or WL were changeable with the seasonal change it funciton should be calculated repeatedly whenever investigating the standing crop of such community. It is able to utilize an indirect value of D30 obtained from the allometry between D30 and H because direct measurement of D30 in the field is accompanied by troublesome and waste of much time.

• Asian-Australasian Journal of Animal Sciences
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• 제19권1호
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• pp.31-34
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• 2006

The experiment was conducted to determine the effects of cutting interval and cutting height on the yield and nutrient composition of hedge lucerne (Desmanthus virgatus) when grown on a sandy soil in the Northeast of Thailand. The cutting intervals compared were 30, 40 and 50 days between harvests and the cutting heights 30, 40 and 50 cm above ground level. The experiment was a $3{\times}3$ factorial layout in a randomized complete block design with 4 replications-giving a total of 36 plots each $3{\times}3m^2$. Harvested plant material was weighed, dried and the ground subsamples taken for analyses of crude protein (CP), crude fiber (CF), ash, ether extract (EE) and nitrogen-free extract (NFE). At the last harvest the hedge lucerne samples were separated to determine leaf to stem ratios and then analyzed for nutrient composition in the leaf and stem. Results showed that increasing the cutting interval (i.e. advancing age of maturity) increased dry matter and nutrient yields significantly. In terms of nutrient content, it also increased the crude fiber, ash, ether extract and nitrogen free extract percent in the plant. However, crude protein percent was markedly decreased as the cutting interval increased. Increasing cutting height had no effect on dry matter yield and yields of nutrients, but in terms of nutrient content, it increased crude protein and ash content, but decreased crude fiber content. The percent EE and NFE in the plant was unaffected by cutting height. From the results presented it is clear that cutting a stand of hedge lucerne every 40 to 50 days will achieve greater dry matter and nutrient yields than cutting more frequently, at 30 days. The cutting height at harvest, whether 30, 40 or 50 cm above ground level had no effect on dry matter or nutrient yields of hedge Lucerne. Hedge lucerne therefore offers the Thai poultry farmer a useful alternative protein supplement for poultry diets rather than relying on the more expensive soybean meal. As it can be readily and successfully grown on a range of soil types and climates throughout Thailand, hedge lucerne also offers the Thai farmer a valuable additional source of income.

• 한국연초학회지
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• 제9권1호
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• pp.45-55
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• 1987

For some basic information in tobacco breeding, the modes of inheritance and heritabilities for the twelve agronomic and chemical characters were estimated in the study of eight varieties partial diallel set. Additive gene actions were significant for all characters except total nitrogen content and dominance gene effects were also significant for all characters. Yield, number of leaves per plant, leaf length and leaf shape index were inherited as partial dominance, and overdominance was detected for plant height, stem diameter, internode length, total alkaloid, total nitrogen and total sugar content. Dominant gene showed increasing effects in yield, plant height, stem diameter, internode length, leaf width and total sugar content, but showed decreasing effects in the other characters. The broad heritability was very high for all characters. and the narrow heritability was high in days to flower and yield, but low in internode length, total alkaloid, total nitrogen and total sugar content.