• 한국작물학회지
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• 제40권5호
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• pp.619-628
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• 1995

본 실험은 온실과 포장에서 재배한 알팔파를 잎, 줄기, 뿌리, 꽃 부분으로 나누어 수확, 건조,하여 물 추출한 후 이 추출물들이 알팔파 발아와 생육에 미치는 영향을 조사 비교하였으며 포장상태에서 자란 알팔파 지상부 전체를 수확,건조, 추출하여 이를 농도별로 처리 알팔파 발아율을 검정하였고, pot실험을 통하여 알팔파 품종간 biomass 분배율 검정과, 알팔파 autotoxicity를 해결하기 위한 방법으로 추출물을 adsorbent로 처리하여 이들이 알팔파 독성성분을 변형시키는지를 검토하였다. 1. 온실과 포장에서 자란 알팔파의 추출물로 알팔파 발아 및 생육에 대한 영향을 비교한 결과 포장에서 자란 추출물질이 발아와 생육에 더 억제적으로 작용하였고, 특히 포장에서 생육한 꽃 추출물 처리가 가장 억제적으로 작용하였다. 2. 농도처리에 따르는 추출물 처리는 농도가 증가 할수록 발아율이 억제되었고, biomass분배율에 대한 pot실험에서는 LWR 과 SLA의 산물인 LAR은 품종간 유의성을 보였다. 3. 알팔파 추출물에 대한 absorbents처리는 추출물의 독성을 변형시키지 못하였다.

• 한국산림과학회지
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• 제87권1호
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• pp.98-105
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• 1998

은행나무 3년생 묘목에 각기 다른 수준의 질소, 인, 질소와 인 복합비료를 시비하고, 묘목의 생장 및 엽내 양분과 유용 추출물의 농도를 측정하였다. 시비 후 묘목의 잎, 줄기, 뿌리의 생체량은 고농도 질소와 인 복합비료 처리구 이외에서는 변화가 없었으며, 엽내 질소와 인 농도의 변화 정도는 시비량에 따라 차이가 있었다. 일반적으로 엽내 질소와 인의 농도는 시비량 증가에 따라 증가하나, 질소 시비량이 400kg/ha인 경우와 인 시비량이 100kg/ha에서는 오히려 감소하였다. 묘목 생장량과 엽내 양분 농도를 고려할 때 묘목은 질소와 인이 결핍된 상태에 있었던 것으로 볼 수 있었다. 시비 후 엽내 이차 대사 물질인 Ginkgo flavon glycosides와 terpene lactones의 농도는 감소하였으며, 은행나무 묘목에서 생체량과 이차 대사 물질량 사이에는 부의 상관관계 (r=-0.739, p=0.036)가 있는 것으로 나타났다.

• 한국작물학회지
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• 제39권5호
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• pp.480-488
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• 1994

White clover는 기존초지에 도입시 정착이 불량한 것이 단점으로 지적되어 왔다. 본시험은 white clover의 발아직후 자엽 및 단엽제거가 건물생산과 형태적 특성에 미치는 영향을 조사하여 기존초지로 도입되는 white clover의 유묘기 관리에 관한 정보를 제공하고자 잎의 크기가 다른 4개 품종(Regal, La. S-1, Huia, S184)을 자엽기에 1개 또는 2개의 자엽을 제거하거나, 단엽기에 단엽, 단엽과 1개의 자엽 또는 단엽과 2개의 자엽을 모두 제거한 후 8주동안 개체당 건물중과 형태적 형질(엽수, 엽면적, 엽병장, 포복경장 및 분지경수)의 변화와 개체당 건물중과 이들 형질과의 관계를 밝히고자 실시하였던 바, 그 결과를 요약하면 다음과 같다. 1. 무탈엽에 비하여 자엽 및 단엽제거는 clover의 개체당 건물중과 형태적 형질을 현저히 감소시켰다. 2. 건물중과 형태적 형질은 단엽기에 단엽과 자엽 제거에 의하여 더욱 감소되고 자엽제거가 많을수록 감소가 큰 것으로 나타났다. 3. 자엽 및 단엽제거 후 생장기간이 증가함으로써 건물중과 형태적 형질이 증가한다 할지라도 포복경장과 분지경수는 처리 6주후부터 급격히 증가하였다. 4. 건물중, 엽면적 및 엽병장은 대엽종일수록 크나, 포복경장, 분지경수 및 엽수는 소엽종일수록 큰 경향을 보였다. 5. 건물중 증가는 엽면적 증가와 밀접한 관련이 있었으나 자엽기에 자엽제거가 단엽기에 단엽과 자엽제거, 그리고 탈엽이 심할수록 증가율(기울기)감소가 큰 것으로 분석되었다.

• Journal of Forest and Environmental Science
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• 제29권4호
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• pp.282-291
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• 2013

Rapid loss in viability of neem (Azadirachta indica A. Juss.) seed is a major problem. Present effort was undertaken for developing a set pattern for assessing of viability and vigour in seed of various mother tree age of neem (Age I-06 years, Age II-15 years, Age III-25 years and Age IV->30 years old). Various viability test viz. triphenyle tetrazolium chloride test, electrical conductivity, excised embryo test, and germination test have been performed on seeds obtained from mother tree age classes. Inconsistency was observed with the TTC and EC test in germination of seed in laboratory as well as nursery. While various vigour tests viz. cold test, chemical stress test (methanol stress test), and accelerated ageing test alongwith ageing index, germination test (G%, MGT and GV) and various seedling growth parameters like seedling length (cm), number of leaves, collar diameter (cm), total biomass (g) alongwith mathematical indices i.e. vigour index, sturdiness quotient, volume index, quality index, root shoot ratio in nursery as well have been taken for study and showed better consistency. On the basis present study results of various viability and vigour test indicated that mother tree age class II performed better in comparison to others and it can be recommended for seed collection. Further it is also recommended that viability of neem seed may be assessed using various laboratory tests like excise embryo test and germination test (G%, MGT and GV) and vigour test may be taken preferably by cold germination test, chemical (methanol) stress test, accelerated ageing test in laboratory and germination alongwith various seedling growth parameters seedling length (cm), number of leaves, collar diameter (cm), total biomass (g) alongwith mathematical indices like Vigour Index, Sturdiness quotient, Volume Index, Quality index, root shoot ratio in nursery as discussed in this study.

• 한국자원식물학회지
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• 제34권5호
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• pp.462-469
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• 2021

본 연구는 제주도 곶자왈 지역에 자생하는 빌레나무를 대상으로 차광 처리를 통해 세 가지 수준의 차광 조건(35%, 55%, 75%)에 따른 개화 및 생장 특성을 분석하였다. 차광률 증가에 따라 개화 시기가 지연되었고, 55% 차광 처리구에서 가장 많은 개체가 개화하였으며, 개체당 화서의 수도 높게 나타났다. 차광률이 증가할수록 묘고가 감소하였고 잎과 줄기의 수는 75% 차광 처리에서 가장 낮은 것으로 나타났다. 전체 및 부위별 생물량도 차광률 증가에 따라 감소하였으며, 35% 차광 처리구에서 75% 차광 처리구 대비 지상부 생물량 2.1배, 지하부 생물량 1.7배, 총 엽면적 2.0배 높은 것으로 나타났다. 종합적으로 고려하면 빌레나무는 건전한 생육을 위하여 차광 처리가 필요하며 개화는 55% 차광 수준, 생장은 35% 차광 수준에서 가장 양호한 것으로 판단된다.

• Journal of Ecology and Environment
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• 제42권1호
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• pp.43-49
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• 2018

Iris laevigata is geographically restricted and legally protected in Korea. In this study, a mesocosm study was conducted to examine the effects of environmental conditions such as water levels and soil nutrient conditions on the growth and survival of I. laevigata seedlings. Complete submergence lowered the total number of leaves, biomass, and survival rates. A rise in soil nutrients increased overall seedling growth and increased tiller numbers via the promotion of asexual reproduction. Also, we found that the lowest measured values of seedlings are associated with the most stressful condition due to the interaction of low soil nutrients and high water levels. I. laevigata seedlings, however, are distributed in low-nutrient habitats such as floating mat, even though they do not grow well under these conditions. This study suggests that I. laevigata does not prefer low-nutrient condition but choose another benefit such as low competition. Also, the water level must be lower than the seedling height for effective growth and management of I. laevigata.

• 원예과학기술지
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• 제35권4호
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• pp.402-409
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• 2017

We performed seed germination tests to investigate the effects of seed sowing orientation on germination viability on peanut (Arachis hypogaea L.) sprouts. Specifically, we assessed the influence of seed sowing orientation on germination rate, seedling weight, and seedling length, as well as the seedling vigor index. The seeds were sown in oak tree sawdust at 3.0 cm depth. Four seed orientations were tested: vertical with the hypocotyl end down, vertical with the hypocotyl end up, horizontal with the hypocotyl end down, and horizontal with the hypocotyl end up. The mean seed germination percentages of the four seed orientations were significantly different (p < 0.01) and ranged from 25 to 91.7%. The vertical orientation with hypocotyl-end-down and hypocotyl-end-up orientations showed the highest (91.7%) and lowest (25%) germination rates, respectively. The vertical orientation with the hypocotyl end down produced the heaviest (4.9 g) seedlings and the longest hypocotyls (4.65 cm). This orientation also produced the longest true leaf + epycotyl (2.15 cm) and had the highest seedling vigor index (197.1). The seedlings had a straight growth pattern, whereas seedlings from seeds sown with the hypocotyl up had an awkward plumular hook shape. Taken together, to produce peanut sprouts, we recommend placing the seeds vertically with the hypocotyl end down because this orientation leads to a high germination rate, high biomass production, and high overall seedling quality.

• The Korean Journal of Ecology
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• 제21권6호
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• pp.805-808
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• 1998

The methanolic crude leaf extract of Acacia melanoxylon shows inhibitory effects on seed germination, shoot growth, root growth and biomass of black gram (Phaseolus mungo L. Co 1) and weeds (Cassia occidentalis L. and Cyperus rotundus L.). The post emergence treatment was given on the 8th day after sowing and 4-6 days after seedling emergence. After postemergence treatment with 20% extract concentration, wilting symptoms appeared in P. mungo and C. occidentalis while necrosis occurred in C. rotundus. The seedling growth was inhibitory at all concentrations (5%, 10%, 20%) as compared to control plants. This inhibitory effect may be due to the presence of allelochemicals like phenolics in the A. melanoxylon leaves. Different types of phenolic acids were identified.

• 한국자원식물학회지
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• 제33권6호
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• pp.586-596
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• 2020

Chionanthus retusus has been used for landscaping and gardening trees, foods and medicines. This study was carried out to analyze the effect of fertilization on the growth performance of container seedlings (1-year-old) in C. retusus. We used multifeed 19 (MF) as a fertilizer, and measured the height, root collar diameter (RCD), biomass, seedling quality index (SQI) chlorophyll contents and chlorophyll fluorescence of the seedlings. The findings of this paper showed that the height, RCD, H/D ratio, T/R ratio and the fresh and dry weight of seedlings increased after fertilization. The moisture content of the stem and root did not show any significant difference among fertilizations, except in the case of the leaf. Production distribution such as the dry weight ratio of leaves and the stem dry weight ratio of fertilized seedlings had a higher value than that of non-treatment. SQI was the highest in MF 1,000 mg/L and 2,000 mg/L treatment. Chlorophyll contents (SPAD value) also increased with the increase in fertilization concentrations. Chlorophyll fluorescence (F_v/F_m) showed the highest value of 0.8 in MF 2,000 mg/L treatment.

• Journal of Forest and Environmental Science
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• 제33권1호
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• pp.22-32
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• 2017

An experiment was set to assess the effect of mixed plantings on initial growth and biomass yield of two common plantation tree species of Bangladesh namely Acacia auriculiformis (A) and Gmelina arborea (G). Study was carried out in the nursery bed of the Seed Research Laboratory and Nursery of Institute of Forestry and Environmental Sciences, Chittagong University (IFESCU), Bangladesh during February to November, 2015. The treatments consisted of two pure planting plots (100% A and 100% G) and five mixed planting plots (50%A: 50%G, 35%A: 65%G, 25%A: 75%G, 65%A: 35%G and 75%A: 25%G) of these two species. In nursery, seedlings were raised in a randomized blocks with four replicates of seven treatment plots. Periodic increments on height (cm), collar diameter (cm) and leaf/phyllode number of the seedlings was taken in every month and continued up to 10 months. The growth and biomass yield of seedlings were measured 10 months after the first seed was emerged. The effects of mixed plantation on growth and biomass were compared to that of seedlings grown in pure plantation. At the age of 10 months it was found that G. arborea seedlings were significantly tallest (240.13 cm) when planted with A. auriculiformis in a proportion of 25%A: 75%G, whereas A. auriculiformis were tallest in the pure 100% A plot, with an average mean height of 135.36 cm. Maximum collar diameter (1.38 cm) was recorded for G. arborea in the mixed plots 75%A: 25%G. Fresh and dry weight of shoots and roots of the seedlings were found significantly (p<0.05) highest in 50%A: 50%G plot for G. arborea. G. arborea also showed highest quality index when mixed with A. auriculiformis in a proportion of 50:50, with an average value of 8.96. The results revealed a positive correlation between seedling growth and various planting patterns.