• 한국작물학회지
• /
• 제48권2호
• /
• pp.89-95
• /
• 2003

The study of this experiment is focused on labor saving of healthy rice seedling production using PSF (polypropylene spunbonded fabrics) as thermal protection material. Several factors such as different compositions of nursery soil and PSF materials were tested to produce healthy rice seedlings. The inner thermal protection material in PE film (polyethylene film) showed $0.9-1.7^{\circ}C$ higher than that of PSF 40-100 $\textrm{gm}^{-2}$. The light transmittance-ratio also showed similar trends. It is considered that the appropriate PSF material density was 40 gm$\textrm{gm}^{-2}$ in accordance with economic values and healthy rice seedlings. Plant height and dry weight according to various nursery soil showed the rang-es of 8.5-14.2cm and 5.5-10.0mg, respectively. In composition of nursery soil, artificial soil combined with paddy soil was effective in producing healthy seedling for rice seedling production. The total sugar content also showed the difference between PSF 40, 60 $\textrm{gm}^{-2}$ PE film (0.43-0.52mg FW $\textrm{g}^{-1}$) and PSF 80, 100 $\textrm{gm}^{-2}$ (0.28-0.35mg FW $\textrm{g}^{-1}$) and it showed the same tendency among varieties as well as various nursery soil. These results demonstrate that PSF 40 $\textrm{gm}^{-2}$ economically affordable, and can be recommended as thermal protection material for producing good healthy rice seedling.

• The Korean Journal of Ecology
• /
• 제19권2호
• /
• pp.125-139
• /
• 1996

The relationships between environmental factors and the establishment and growth of oak seelings were studied in the greenhouse. The early seedling performances of three oak species (Quercus mongolica, Quercus serrata, Quercus variabilis) were compared. Mean seed weight was the biggest in Q. variabilis, and the smallest in Q. serrata, and the germination rate was higher in Q. variabilis than in Q. mongolica and Q. serrata. The germination rate was significantly affected by seed weight class in Q. serrata, but not in Q. mongolica. Emergence of oak seedlings was similar in all three oak species, and especially the first leaf emergence increased about twenty days after germination. An experiment was designed using three environmental factors (light, soil moisture, fertilizer) to compare the response of the three oak species. Light and soil moisture significantly affected the seedling height growth of Q. variabilis, but the effect was marginal in Q. mongolica and Q. serrata. However, growth of seedling biomass was significant in all three oak species. In contrast, fertilizer did not affect seedling growth of any of the oak species. Q. variabilis is expected to grow well in large gaps because it is very sensitive and responds well to high light and high moisture conditions. Q. mongolica and Q. serrata are relatively tolerant to shade but may need gaps for the seelings to grow into saplings.

• Journal of Ecology and Environment
• /
• 제33권2호
• /
• pp.133-139
• /
• 2010

Atmospheric $CO_2$ concentrations have increased exponentially over the last century and, if continued, are expected to have significant effects on plants and soil. In this study, we investigated the effects of elevated $CO_2$ on the growth of Pinus densiflora seedling and microbial activity in soil. Three-year-old pine seedlings were exposed to ambient as well as elevated levels of $CO_2$ (380 and 760 ppmv, respectively). Growth rates and C:N ratios of the pine seedlings were also determined. Dissolved organic carbon content, phenolic compound content, and microbial activity were measured in bulk soil and rhizosphere soil. The results show that elevated $CO_2$ significantly increased the root dry weight of pine seedling. In addition, overall N content decreased, which increased the C:N ratio in pine needles. Elevated $CO_2$ decreased soil moisture, nitrate concentration, and the concentration of soil phenolic compounds. In contrast, soil enzymatic activities were increased in rhizosphere soil, including ${\beta}$-glucosidase, N-acetylglucosaminidase and phosphatase enzyme activities. In conclusion, elevated $CO_2$ concentrations caused distinct changes in soil chemistry and microbiology.

• Ocean and Polar Research
• /
• 제44권4호
• /
• pp.311-317
• /
• 2022

Seed germination and seedling growth of a halophyte, Suaeda japonica were examined to measure the effects of seed preservation periods and various soil compositions in the mudflat of Saemangeum, Korea. Seed germination declined from 74.30% to 44.30% as the preservation period increased from 4 months to 12 months. After 14 days of seeding, seed germination was lowest in sandy soil (SS) at 8.67% and highest in earthworm cast+leaf mold (EC+LM) at 67.33%, showing 4~5 times higher than SS. The average lengths of seedlings were 12.20 mm in SS and 42.20 mm in EC+LM, respectively. These results suggest that seed germination and seedling growth enhanced in the soil that has more organic matter. In the experiment mixing Saemangeum soil (SMS), seed germination was from 4.00% in SMS to 88.00% in the soil of SMS+EC+LM after 14 days. Similar growth patterns were observed in the length of seedlings from 5.00 mm in SMS to 49.60 mm in SMS+EC+LM. The present results indicate that a population of Suaeda japonica could be established by stimulating seed germination and seedling growth by the addition of organic matters such as EC, LM, and EC+LM in the Saemangeum mud flat.

• 한국작물학회지
• /
• 제22권2호
• /
• pp.27-31
• /
• 1977

수도기계이앙 육묘에 알맞는 상토의 종류와 상토 pH를 1977년 작물시험장 답작포장과 온실에서 조생통일과 통일을 공시하여 본시험을 실시한 결과 1. 기계이앙 육묘에 알맞는 상토는 식양토인 답토양에다 완숙된 퇴비분말을 2 : 1로 혼합작성한 상토가 투수력과 보수력이 좋아 묘생육및 묘소질이 양호하였다. 2. 상토의 pH에 따른 묘의 생리장해와 묘소질을 보면4∼5에서는 초장이 길고 건물중이 무거웠으며 뜸묘및 입고병 발생이 없어 묘소질이 양호하였다. 3. 상토 pH 6이하에서는 초장이 신장되지 않았고 뜸묘및 묘립고병발생이 심하여 묘소질이 양호하였다. 4. 기계이앙 육묘시 생리장해인 뜸묘와 입고병은 상토 pH가 높은데 기인됨으로 pHwhwjf이 중요함을 인식하였다. 5. 묘립고병및 뜸묘방제는 다찌가렌 분제를 상자당 5g 또는 다찌가렌악제를 1000배액으로 540cc 살포한 구가 무시용구에 비하여 묘립고병 및 뜸묘발생이 현저히 적어 다찌가렌시용 효과가 인정되였다.

• 한국약용작물학회지
• /
• 제11권5호
• /
• pp.340-346
• /
• 2003

묘삼 재배시 원야토와 약토의 적정 혼합비율을 설정하고 해가림 시설 설치시 기존관행 방법의 문제점을 개선하고 작업효율을 높이기 위하여 시험을 수행 한 결과는 다음과 같다. (1) 상토조제시 약토의 적정 구성비율 설정시험에서 약토함량이 증가할수록 고상은 감소하고, 공극율과 기상, 토양중 OM과 $P_2O_5$ 함량이 증가하는 경향이었다. (2) 약토함량별 지상부 생육은 약토함량 증가에 따라 엽면적, 엽록소는 증가하였으며, 지하부 생육중 근경과 근중이 증가하였다. (3) 약토조성별 규격묘 생산량은 백마사 약토비율이 10:1처리에서 사용가능 묘삼은 750개/칸 수준으로 양호하였다. 2. 해가림 (일복) 전주목 적정높이를 설정하기 위한 시험에서 (4) 전주높이별 광량은 전주높이가 높을수록 광량이 많았으며 평균지온은 전주높이가 150 cm에서 낮아 광량과 지온은 비례하였다. (5) 해가림 시설 전주목 높이가 낮을수록 엽록소 함량과 근중이 증가하는 경향이었고, 사용가능 묘삼수는 처리간 유의성은 없었으며, 또한 관행보다는 그 수가 적었지만 전주높이 150 cm에서 740개/칸로 높았다.

• 한국환경농학회지
• /
• 제25권4호
• /
• pp.382-385
• /
• 2006

정수장슬러지의 수도육묘용 상토로서의 사용 가능성을 검토하기 위하여 정수장슬러지와 모래의 비율을 달리하는 상토들을 조제 후 시판용 상토를 대조로 수도유묘의 생육 및 무기성분흡수 특성을 조사하였다. 정수장슬러지 이용 상토는 시판용 상토에 비해 수도유묘 지상부의 신장 및 생중량이 다소 부진하고 인의 흡수량이 낮았던 반면, 지하부의 신장 및 생중량은 현저한 증가를 보여 정수장슬러지가 수도유묘의 뿌리발달에 탁월하고 뿌리의 매트형성이 우수하였다. 따라서 비록 정수장슬러지 이용 상토가 시판용 상토에 비해 수도유묘의 지상부 생장이 부진하고 인의 흡수가 다소 낮다 할지라도, 상토의 필수 조건인 뿌리의 매트형성이 탁월하고 단간의 지상부가 직립으로 매우 건실하며, 높은 pH에도 불구하고 입고병과 같은 병 발생이 없어 수도육묘용 상토로 이용 가능성이 높은 것으로 판단된다. 정수장슬러지 첨가에 따른 이러한 수도육묘의 뿌리생장 증가 효과는 정수장슬러지와 모래를 50:50 비율로 혼합한 상토에서 가장 우수하였다.

• 펄프종이기술
• /
• 제46권5호
• /
• pp.9-18
• /
• 2014

London Convention on the prevention of marine pollution by dumping of wastes and other matter prohibits the deliberate disposal of paper mill sludges at sea. In order to explore the alternative plan on the prohibition of sludge disposal at sea, the biodegradable seedling pot was developed by mixing the sludge with old newspaper (ONP) in appropriate mixing ratios. The C/N ratio of the mixed sludge was below 20, leading to rapid deterioration of the organic matters composing the seedling pot. The increased ONP contents in the seedling pot resulted in the increase of pot thickness and thereafter in the decrease of pot density. Cellulose fibers in ONP promoted water absorption of the pot but AKD addition helped the seedling pot to repel water during raising seedling. Breaking length and burst strength of the seedling pot were improved by addition of wet strength additives but air permeability was a little diminished. Biodegradable rate of the seedling pot in a soil was accelerated by the attack of soil microbes at the beginning, and finally the pot was completely degraded in 150 days in a soil.

• Journal of Ginseng Research
• /
• 제18권2호
• /
• pp.134-136
• /
• 1994

The effects of soil phosphorus level on seed emergence, seedling mortality, plant and root development of American ginseng (Panax quinquefolium L.) were evaluated in a newly planted commercial ginseng garden. Phosphorus levels were increased from 58 ppm to 100, 150 and 200 ppm with triplephosphate (0-45-0). Higher phosphate levels increased, seed emergence and reduced seedling mortality. Root length, diameter, fresh root weight and total leaflet length were not affected by phosphate levels.

• Journal of Ginseng Research
• /
• 제7권2호
• /
• pp.163-168
• /
• 1983

Effect of rice hull mulching and peat application on seedling yield of Panax ginseng was investigated in modified Yang-jig seedbed. Mulching and peat increased soil moisture content but effect was not additive. Seedling yield was positively correlated with magnesium organic matter, potassium especially with soil moisture and calcium. Straw mulching is expected to be superior for practice.