• Journal of Forest and Environmental Science
• /
• 제29권2호
• /
• pp.125-130
• /
• 2013

An attempt was made on pulp production from the fast growing plant, Acacia hybrid to determine the total yield, screened yield, Kappa number, and fibre morphology of organosolv Acacia hybrid pulp. Uniform-sized chips were taken to undergo pulping in a digester with five different concentrations of ethanol, 50%, 60%, 70%, 80% and 90% (v/v) with 1 M of sodium hydroxide as catalyst. All chips were digested in a temperature-controlled digester with constant amount of water added and temperature of $185^{\circ}C$ with the duration of three hours cooking time and correspond pressure 1.1-1.2 MPa. It was observed that increasing of ethanol concentration has led to pulp yield increment and decreased in the degree of delignification at the same time. This study was aimed to focus on the effect of the varied concentration of organic solvent towards the pulp yield and its relationship with Kappa number and pulp yield.

• Plant Resources
• /
• 제7권1호
• /
• pp.54-59
• /
• 2004

This study was conducted to investigate the relationships between yearly variations of weather elements and productivity in rice. In addition, coefficients of correlation among yield and yield components were used to find out the relationships between weather elements and productivity. Coefficients of variance (C.V.) of air temperature mean was considerable with 25％, but the variation by duration of sunshine was small in May. Culm length and number of spikes were great with c.v. of 21.5, 16.4％, respectively. Coefficients of correlation between temperatures of cultivation in May and yield were positive correlations. Coefficients of correlation between precipitation and sunshine of cultivation period from Oct. to May and yield were negative correlations. Coefficients of correlation amount the culm length, number of spikes, 1,000 grains wt. of seed, and yield were positively significant at the level of 1 ％, respectively.

• 한국작물학회지
• /
• 제44권4호
• /
• pp.321-329
• /
• 1999

The effect of water deficits on soybean [Glycine max (L.) Merr.] could appear on seed quality through changes of morphological plant characteristics. Two Korean genotypes, Hwangkeum (determinate growth habit) and Muhan (indeterminate growth habit), were used to examine the influences of treatment stage and method of water deficit during reproductive growth period on yield and seed quality of soybean. Water deficit at R5 or R6 stages was as damaging to seed quality as double water-deficit treatments at R2+R5 or R2+R6. However, seed from double water-deficit treatment tended to have lower oxidation-reduction potential compare to the corresponding single water-deficit treatment. In comparison with Muhan, Hwangkeum had significantly greater oxidation-reduction potential value. Seed yield per plant in both genotypes depended greatly on seed yield of branches. However, the proportion of number of branch seed to total seed umber in Hwangkeum was increased as the water deficit was applied during later reproductive stage, whereas, in Muhan the proportion was lower. Water-deficit treatments including the single and double water-deficit treatments and non-stressed treatment were able to be classified into five groups for Hwangkeum and four groups for Muhan based on the influences on yield components, number of pod, number of seed, and single seed weight, using principal component analysis. In both genotypes, R2+R5 water-deficit treatment decreased number of pod and seed, but increased single seed weight. On the contrary, R6 or R2+R6 stress increased the pod and seed number, but decreased single seed weight.

• 한국작물학회지
• /
• 제29권3호
• /
• pp.285-290
• /
• 1984

대두에 왜화제인 B 995와 CCC를 살포시기별(본엽 4, 5, 6 매), 농도별 (500, 1000, 2000, 3000 ppm)로 엽면살포하여 생육 및 수량에 미치는 영향을 구명하고자 본 실험을 수행하여 얻어진 주요결과는 다음과 같다. 1. 약제별로는 경장에서만, 살포시기별로는 결협율에만, 그리고 농도별로는 경장, 분지수, 결협율, 주당협수와 수량에서만 유의성이 인정되었다. 2. 견장의 단축은 CCC보다는 B 995가 더 효과적이었으며 결협율은 본엽4 매시의 살포에서 가장 높았다. 3.농도별효과를 보면 저농도보다는 고농도인 3,000ppm에서 경장의 단축, 분지수, 결협율 그리고 주당협수의 증가와 수량의 증대를 나타냈다. 4. 주경절수, 경건중, 엽록소와 100입중은 약제살포시기 및 농도별로 유의성이 없었다. 5. 수량은 경장과는 부의 상관이었고 분지수, 주당협수, 결협율과는 정의 상관이었다. 6. 왜화제의 엽면살포는 주요수량구성 요소증대에 상당히 효과적이었다.

• 생물환경조절학회지
• /
• 제6권2호
• /
• pp.92-96
• /
• 1997

단고추의 장기자루식 양액배지에 있어서 분지수가 생육과 수량에 미치는 영향을 구명하고자 1폿트당 4지, 6지, 8지를 유인하여 재배한 결과를 요약하면 다음과 같다. 1 초장, 경경, 엽중, 근중, 경중은 유의성은 없었으나 엽수와 엽면적은 8지유인에 많았다. 2. 과경, 과중은 4지 유인구에서 많았고 유의성은 없었으나 수량도 124.5ton/ha로 8지 유인의 113.4ton/ha보다 9% 많았다. 3. 유인방법별 월별 수량은 초기 5개월은 8지 유인이 4지 유인보다 많았으나 중기이후인 4월부터 수확 종료까지 4지 유인이 수량이 많았으며 유인에 따른 노동력 절감 및 상품율면에서 자루식 장기재배의 경우 4지 유인이 알맞을 것으로 사료되었다.

• 한국초지조사료학회지
• /
• 제16권4호
• /
• pp.291-298
• /
• 1996

This study was carried out at Crop Experiment Station in 1993 and 1994. The objective of this study was finding out variation of growth and yield of corn according to maturity. Hybrids of corn used in this study were early maturing corn Comet80, Elite90, Royaldent IOOT, Royaldent T$\times$llO, P3525, P3394, medium maturing corn Royaldent 120T. and late maturing corn Jungbuok, P3144W. G4743. Stalk height, leaf number, ear weight, stover weight, and TDN yield of early maturing corn were linearly increased with prolonged maturity in 1993 growing season. Leaf number, and stover weight of early and late maturing corn were linearly increased with prolonged maturity in 1994 growing season. But ear weight of late manuring corn was not increased as much as that of early manuring corn with prolonged maturity. Increase of total DM and TDN yield of late maturing corn was due to stover weight increase compared with ear weight increase of early maturing corn. Leaf number and stover weight were highly correlated with silk (Growing Degree Days) GDD.

• 한국육종학회지
• /
• 제40권4호
• /
• pp.371-376
• /
• 2008

For the purpose of breeding a high-yield superior variety of Korean raisin tree (Hovenia dulcis var. koreana Nakai), whose value as an edible and medicinal resource is increasing, tree candidates for superior individuals were selected from its 11 habitats in Korea from 1996 to 1998. A clone bank preserve was created in 1998 with 70 clones proliferated by grafting; the fruition traits (e.g., the number of fructified laterals, the average number of bunches per fructified lateral, the average number of bunches per fruiting lateral, the fruitpetiole weight per individual, and the yield per individual) of 47 clones that had bloomed and borne fruit were investigated and analyzed in 2002; five upper-ranking clones whose yield per individual exhibited a 261% improvement against the total average were picked in 2005; and three clones, including 'Poong-Sung 1', that showed a difference in their fruit petiole ripening stage, were finally selected in 2007 as high-yield new cultivars of Korean raisin tree.

• 한국작물학회지
• /
• 제40권1호
• /
• pp.39-43
• /
• 1995

남부지방의 목화 재배체계 및 안전다수확을 위한 지초자과를 얻고자 Vinyl 피복과 무피복 재배아래서 재식밀도 차이에 따른 생육, 수량 및 면모의 발생등을 검토하였던 바 다음과 같은 결과를 얻었다. 1. 경장, 결과피수, 삭수$m^2$당 삭수 등의 모든 형질이 Vinyl피복구에서 우수하였으며$m^2$당 삭수는 Vinyl피복구에서나 무피복구에서나 70${\times}$10cm재식에서 가장 우수하였다. 2. 실면수량과 1삭실면중 역시 Vinyl피복구에서 높았으며 실면수량은 Vinyl피복구와 무피복구 모두 70${\times}$10cm재식에서 가장 우수하였다. 3. 섬유장, 섬유비율 모두 Vinyl피복의 결과가 인정되었으며 섬유장은 주문거리가 넓을수록 길었다.

• 한국작물학회지
• /
• 제48권4호
• /
• pp.326-333
• /
• 2003

Transgenic rice plants expressing a Bacillus subtilis protoporphyrinogen oxidase (Protox), the last shared enzyme of the porphyrin pathway in the expressed cytoplasm or the plastids, were compared with non-trangenic rice plants in their growth characteristics such as tiller number, plant height, biomass, and yield. Transgenic rice plants of $\textrm{T}_3$ generation had 8 to 15 % and 25 to 43% increases in tiller number compared to non-transgenic rice plants at 4 and 8 weeks after transplanting(WAT); similar values were observed for $\textrm{T}_4$ generation at 4 and 8 WAT. However, the plant height in both $\textrm{T}_3$ and $\textrm{T}_4$ generations was similar between transgenic rice plants and non-transgenic rice plants at 4 and 8 WAT. Transgenic rice plants had 13 to 32% increase in above-ground biomass and 9 to 28% increase in grain yield compared to non-transgenic rice plants, demonstrating that biomass and yield correlate with each other. The increased grain yield of the transgenic rice plants was closely associated with the increased panicle number per plant. The percent of filled grain, thousand grains and spikelet number per panicle were similar between transgenic and non-transgenic rice plants. Generally, the growth and yield of transgenic generations ($\textrm{T}_2$, $\textrm{T}_3$, and $\textrm{T}_4$) and gene expressing sites (cytoplasm-expressed and plastid-targeted transgenic rice plants) were similar, although they slightly varied with generations as well as with gene expressing sites. The transgenic rice plants had promotive effects, indicating that regulation of the porphyrin pathway by expression of B. subtilis Protox in rice influences plant growth and yield.

• 한국작물학회지
• /
• 제32권1호
• /
• pp.78-85
• /
• 1987

본 실험은 팔당호밀을 사용하여, 우리나라 중북부 지방에서 월동전 청초 이용후 종실을 생산할 수 있는지를 검토코저, 춘천, 수원, 화성 및 청주에서 2개년 동안 실시하였다. 파종기는 각 지역 모두 4파종시기로서, 청초예취는 월동직전 1회 예취하여 실시하였으며 그 결과를 요약하면 다음과 같다. 1. 월동전 예취시 초장, $m^2$당 경수 및 청초수량은 조기파종인 9월 11 일 파종에서 가장 크고 많았으며, 만기파종인 10월 11 일 파종에서 가장 적었는데, 춘천의 9월 11 일 파종에서 청초수량이 10a당 1.803kg으로서 가장 많았다. 2. 청초수량의 기여정도는 주로 초장 및 경수에 의하여 좌우되는데 경수보다는 초장의 기여도가 더 크게 영향하였다. 3. 예취에 의하여 월동중 냉해의 피해를 받았으며, 또한 출수기가 늦고, 초장도 감소되었다. 4. 수량구성형질중 $m^2$9당 수수만이 예취별에 따라 고도의 유의성 있었으며, 타형질들은 파종기 및 예취구분간에 변이가 적었다. 5. 종실수량은 무예취구에서 많았으며 예취구와의 차이는 45kg/10a로서, 예취구의 간장 및 월동률저하는 종자수양을 감소시켰다. 또한 수양구성요소중 $m^2$당 수수는 종자생산에 가장 크게 영향하였다. 6. 청초수량이 많은 조파의 종실수량은 청초예취 및 무예취구간에 변이가 적고 절대수량이 많아 적절한 재배관리에 의하여 축산농가에서 월동전 청초이용후 종실을 생산할 수 있다.