• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2005년도 정기총회 및 학술대회
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• pp.3-14
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• 2005

To investigate phytotoxic substances in some donor plants and their biological activities, seed germination and seedling growth of receptor plants were examined at different concentrations of aqueous extracts and essential oils of the donor plants. Germination of some receptor species was inhibited by the extracts, while seedling growth was decreased to a lesser degree than in the germination test. Germination, seedling growth and dry weight growth of Achyranthes japonica grown in pot were proportionally inhibited by the extracts. Volatile substances emitted some donor plants caused inhibitory effects in the germination and seedling growth of the receptor species. Essential oil of the plants extracted by Karlsruker's apparatus Inhibited growth of microorganisms, callus growth and root hair development of receptor plants. The cortical cells at the root tips of Latuca sativa treated with essential oils showed contraction of the cytoplasm, resulting in plasma membranes becoming detached from the cell walls and the cells metamorphosing irregularity. Accumulation of lipid granules Inside contracted cytoplasm and degeneration of mitochondrial cristae were also observed. The GC/MS method was employed for analysis and identification of allelochemicals from donor plants. Sixty-one chemical substances such as camphene, cineole etc. were identified from essential oils of Artemisia argyi.

• 한국작물학회지
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• 제35권3호
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• pp.201-210
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• 1990

본 시험은 입고병 방지제로 알려진 hymexazole과 metalaxyl의 혼합제(Tachigarace)가 수도 유묘의 생육 및 저온장해 경감에 미치는 영향을 살펴보고 도 체내 저온 대응의 생리적 기작을 밝히고자 작물시험장 인공기상실에서 통일형인 용문벼를 공시하여 hymexazole과 metalaxyl의 혼합제(Tachigarace)를 pot(5$\times$15$\times$10cm)당 0, 9, 18, 36mg를 토양혼화 처리하고 저온(12/12$^{\circ}C$) 처리한 후 저온반응 생리를 파악하였으며 일본형인 팔공벼를 공시하여 노화묘의 경엽을 절제한 후 hymexaazole과 metalaxyl의 혼합제(Tachigarace)를 상자(30$\times$60$\times$3cm)당 0.36g 시용하고 0, 7, 14, 21일후에 생육 양상을 검토한 결과를 요약하면 다음과 같다. 1. hymexazole과 metalaxyl의 혼합제(Tachigarace) 처리묘는 무처리묘에 비하여 지상부와 지하부 생육, 건물중, 굴기력 및 발근력이 많았으며 18mg 처리구에서 가장 효과적이었다. 2. 저온(12/12$^{\circ}C$) 처리시 유묘는 hymexazole과 metalaxyl의 혼합제(Tachigarace) 처리로 적고 및 엽고사 정도가 현저히 감소하였으며 지상부와 지하부의 저온 신장성은 36mg/pot 까지는 처리양이 증가할수록 컸다. 3. 저온하에서 hymexazole과 metalaxyl의 혼합제(Tachigarace) 처리묘는 엽면적, 뿌리 용적, 엽록소 함량 및 뿌리의 산소 소모량 등 생리활성의 감소폭이 작으며 기공저항성이 크고 증산량은 작아서 유묘의 저온에 대한 내성이 강하였다. 4. 육묘일수 연장에 따라 초장, 건물중 및 엽면적이 증가하였으며 경엽 절제와 hymexazole과 metalaxyl의 혼합제(Tachigarace) 처리에서 그 증가폭이 크게 나타났다. 5. 발근력은 육묘일수 연장으로 방임구에서는 점감하였으나 경엽 절제구에서는 점증하였고 hymexazole과 metalaxyl의 혼합제(Tachigarace) 처리에서는 그 효과가 더욱 뚜렷하였다.

• 한국작물학회지
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• 제46권4호
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• pp.284-288
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• 2001

Water deficit is a serious constraint to soybean [Glycine max L. (Merr.)] production in rainfed regions of Asia, Africa, and America. This study was conducted to develop a simple and effective screening method for drought tolerance in soybean. Fifteen soybean cultivars, eight identified to be drought-tolerant and seven drought-sensitive in previous studies, were used for the evaluation of drought tolerance under the new screening conditions. The seedling screening method was consisted of a treatment in a PEG solution and drought treatment in parafilm-layered pots. 5-day-old seedlings were treated in a 18% PEG solution for 4 days and their wilting and hypocotyl browning were recorded. Three seedlings grown in a parafilm-layered pot containing peat moss were drought-stressed by withholding water from the third day after seedling emergence, and root and seedling growth were examined. Degree of drought tolerance were rated based on seedling vigor in the PEG solution and drought-stressed parafilm-layered pots, and also on the penetration ability of roots through parafilm layer. Most of seedlings of the drought-tolerant cultivars showed higher vigour and root penetration than those of the drought-sensitive cultivars under the new screening conditions. Our results indicate that the new method can be used as a simple and effective screening procedure for drought tolerance in soybean breeding programs.

• 한국작물학회지
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• 제42권4호
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• pp.378-383
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• 1997

벼 품종 안중벼를 공시하고 조류 기피제인 methiocarb을 여러 가지 제형으로 제조하고, 약량을 달리하여 최아 볍씨에 처리한 후 새 피해, 초기 생육 및 약해를 조사한 결과를 요약하면 다음과 같다. 1. <시험 1> Methiocarb 제형별 새 피해 경감 효과와 모의 생육 1) Methiocarb의 처리는 제형과 약량에 관계없이 새에 의한 피해가 없었으나 무처리구는 5일후에 30％, 10일 후에 85％, 15일 후에는 100％의 피해를 입었다. 2) 입모율은 처리간 유의한 차이가 없었으나, 파종 15일 후의 초장과 잎수는 methiocarb 15g 처리구에서는 methiocarb 10g 처리구에 비하여 유의하게 작아서 약해가 있었다. 3) 파종 35일 후 약해에 대한 회복 상태를 보면 methiocarb＋thiram 15g 처리구는 초장이 유의하게 작았으나, methiocarb FS 15g처리구 초장은 무처리구와 큰 차이가 없었다. 2. <시험 2> Methiocarb 제형의 벼 종자 분의에 의한 본답 시험 1) Methiocarb 처리구는 무처리구에 비하여 새 피해가 유의하게 경감되는 것으로 나타났다. 2) 파종 25일 후의 초장과 잎수는 모든 처리구에서 유의한 차이를 보이지 않았다. 3) 파종 10일 후에는 약제 처리구는 경후한 약해가 발생하였으나 파종 20일 후에는 무처리구와 큰 차이가 없었다.

• 농업과학연구
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• 제48권4호
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• pp.945-956
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• 2021

The effective growth of pepper seedlings relies on the growing period and tray used, which both aim to minimize seedling damage during the transplantation process. Therefore, the objective of this study was to evaluate the effect of red and green pepper seedling growth in plug and cylindrical paper pot (CPP) trays with different growth periods of the seedlings. Two different seedling growth trays were used for the two varieties of pepper seedlings in the same growing media. The pepper seedling growth rates were investigated at 15, 30, and 45 days for each of variety. Important parameters, e.g., the plant height, fresh weight for the plant and root, number of leaves, leaf length and width, and leaf chlorophyll contents, were measured. During the experiment, the CPP tray maintained uniform seedling growth as compared to the plug tray. CPP trays ensured the height of the seedling, with these results 0.84 to 1.6 times higher than those of the plug tray for all conditions, indicating the good quality of the pepper seedlings. The shoot and root weights were found to be greater with more leaves in the CPP tray seedlings for 45 days compared to the seedlings grown in the plug tray, whereas the green pepper variety showed a greater leaf ratio than the red pepper seedlings. The analysis of pepper seedling growth presented in this study will guide the selection of suitable growth trays and seedling periods for farmers when they undertake automatic pepper transplantation in the field.

• 한국환경농학회지
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• 제30권3호
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• pp.275-280
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• 2011

본 연구는 전라북도 친환경농업실천 농가포장에서 벼 육묘방법별 생육, 도복형질, 쌀의 품위 및 품질 등을 비교 분석하여 친환경쌀 생산에 적합한 이앙방법을 구명하였다. 육묘방법별 생육특성으로 수수, 립수, 등숙비율, 천립중은 포트육묘>조파육묘>산파육묘 이앙재배 순으로 우수하였으며, 특히 수수, 립수의 경우 산파육묘 이앙재배 대비 포트육묘 이앙재배에서 각각 1.6개/주(10.4%), 30.1개/수(35.1%)가 많아 쌀 수량이 41 kg/10a(8.8%) 증수되었다. 포트육묘의 단위면적당 적정 이앙주수는 56주/$3.3m^2$로 50주/$3.3m^2$보다 등숙비율은 낮았으나 수수, 립수는 많아 수량지수가 2.6% 증가한 555 kg/10a이었다. 이는 관행인 산파육묘 이앙재배보다 49 kg/10a 증수된 109.7%이었다. 도복형질은 포트육묘 이앙재배에서 3절 두께가 산파육묘 이앙재배에 비해 0.31 mm(9.0%) 양호하였다. 뿌리길이 및 건물중은 포트육묘에서 산파육묘 이앙재배에 비해 각각 2.8 cm(13.8%), 1.8 g(25.3%) 우수하였다. 쌀 품위 및 품질은 포트육묘 이앙재배에서 산파육묘 이앙재배에 비해 완전미율이 4.4% 높았고, 싸라기비율이 1.8% 낮았다. 단백질 함량은 포트육묘 이앙재배에서 0.4% 낮았다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2006년도 하계 학술대회 논문집
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• pp.68-72
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• 2006

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2006년도 하계 학술대회 논문집
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• pp.83-87
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• 2006

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 추계학술발표논문집
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• pp.213-221
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• 2006

• 한국환경과학회지
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• 제24권8호
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• pp.1037-1043
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• 2015

Since single-use disposable plastic usage has steadily been increasing, recent trends in polymeric research point to increasing demand for eco-friend materials which reduce plastic waste. A huge amount of non-degradable polypropylene (PP)-based pots for seedling culture are discarded for transplantation. The purpose of this study is to investigate an eco-friendly biodegradable material as a possible substitute for PP pot. The blend of poly(lactic acid) (PLA) with poly(butylene adipate-co-terephthalate) (PBAT) was used because of its good mechanical and flexible properties as well as biodegradation. After landfill, various properties of the blend pot were investigated by UTM, SEM, NMR and TGA. The results showed the tensile strength of the blend film rapidly decreased after 5 weeks of landfill due to degradation. From NMR data after landfill, the composition of PLA in the blend was decreased. These results indicate that the biodegradation of the blend preferentially occurs in PLA component. To investigate the effect of holes in pot bottom and side on root growth, a plant in the pot was grown. Some roots came out through holes as landfill period increases. These results indicate that the eco-friendly pot can be directly planted without the removal of pot.