• The Plant Pathology Journal
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• 제23권4호
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• pp.295-299
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• 2007

These experiments were carried out to examine efficacy of soil solarization for control of pink root disease by means of mulching with transparent polyethylene sheets in the hot season. The effects of soil solarization on incidence of pink-root disease caused by Pyrenochaeta terrestris and on onion growth and on populations of soil fungi were investigated. Solarization was dramatically effective in reducing pink root incidence in onion seedling and harvested onion bulb. A 30-day and 40-day solarization treatment significantly improved seedling survival and increased yield of 'Changnyeong-deago' onion while decreasing incidence of pink root. Populations of soil fungi from fields planted to onion were assayed on selective media. Solarization treatment was effective in reducing populations of P. terrestris, Pythium spp., and Rhizoctonia sp. in soil. Increase of yield of onion bulbs was associated with control of soil-borne pathogenic fungi. Soil solarization had beneficial effects on yield, bulb diameter, or incidence of pink root.

• 한국초지조사료학회지
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• 제7권2호
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• pp.79-86
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• 1987

This study was carried out to investigate the relationships and the variations of agronomic characteristics in the shoot and root part of grasses for the basic data of the development, the management and the utilization of pasture in the forest. This study was conducted with 0% (full sunlight), 25%, 50% and 75% of shading degrees after orchardgrass, timothy, perennial ryegrass, ladino clover and orchardgrass dominated mixture were planted on Aug. 25 in 1984. The results are summarized as follows: 1. Dry matter yield in 25% of shading was increased 3-1 7% compared with 0% (full sunlight), while 50 and 75% of shading were decreased 28-35% and 44-60%, respectively. Dry matter yield of timothy, perennial ryegrass and ladino clover were decreased 10, 8 and 33%, respectively, compared with orchardgrass, but there was little difference between orchard grass and mixture. 2. Root distribution by different shading degrees was the maximum at 25%, followed by 0, 50 and 75% of shading degrees. Root distribution among different species was the maximum at orchardgrass, followed by perennial ryegrass and timothy. Especially, root distribution of timothy was very little compared with different species. And significantly positive correlation was observed in the relationship between root weight and dry matter yield (r=0.8 102**). 3. The physiological activity of root by different shading degrees was declined by more shading. 4. The length and the percentage of blade by different shading degrees was an increase tendency by more shading. The length and the percentage of blade among different species was followed by timothy, perennial ryegrass and orchardgrass, in that order. And the correlation between the percentage of blade and dry matter yield was significantly negative.

• Journal of Ginseng Research
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• 제13권2호
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• pp.147-152
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• 1989

The statistical characteristics of three year old American ginseng (Panax quinquefolium 1.) root yields from Lytton, British Columbia, Canada are presented. Ginseng root yield is related to plant density, with the highest yields generally obtained from the sites with the highest plant densities. However, these higher yields are made up of a larger proportion of smaller roots while the proportion of larger roots remains almost constant throughout the range of plant densities sampled. Further, it is suggested that relatively small samples can provide significant insight into crop performance and growth.

• Journal of Ginseng Research
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• 제15권3호
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• pp.197-199
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• 1991

Growth of ginseng and physical properties of soil were compared with bed height in experimental plots of sand loam for four year and clay loam soil for three year old ginseng plants, respectively. Field survey was also carried out to compare yield and soil physical properties with bed height in the same fold of six years old ginseng fields. High yield of ginseng root was observed at high bed both in the experimental plots and field survey as well. The rate of rusty root was significantly reduced at high bed. Soil porosity increased but soil hardness decreased at high bed.

• 한국약용작물학회지
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• 제18권2호
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• pp.93-97
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• 2010

Cultural practices of Asparagus cochinchinensis in highland area were performed for a potential medicinal crop. These studies were examined to propagation methods, planting densities, nitrogen treatments, and cropping years. The results are summarized as follows. The adequate number of buds per tuberous root was 4 for vegetative propagation because the number of tuberous root harvested was 16.8 and the yield was also the highest, exhibiting 1,060 kg/10a. The suitable planting time for vegetative propagation was later than early April. If the earlier tuberous roots were planted, the less they emerged. The highest emergence rate was obtained from the planting density of $30{\times}20cm$ as 97.2% while the yield was highest in the $30{\times}15cm$ density, exhibiting 1,883 kg/10a with emergence rate at 94.9. It seemed that the higher planting density promoted plant height growth and yield in Asparagus cochinchinensis. The highest fresh weight was recorded at 6 kg/10a of nitrogen fertilizer into the sandy loam soil compared to the level of 0, 3, 9 kg/10a. The yield was increased with cropping years. However, the proper harvesting time was the second year of cultivation because the rate of weight increase was maximized in the 2-year-old tuberous root. The yield in the third year was decreased as compared to that of the second year.

• 한국자원식물학회지
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• 제9권3호
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• pp.268-275
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• 1996

봄철 더덕순 채취(採取)가 더덕의 수량(收量) 및 품질(品質)에 미치는 영향(影響)을 구명(究明)하기 위하여 1992년부터 1994년까지 3년간 시험한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 더덕순 채취별(採取別) 생육(生育)은 채취회수(採取回數)가 많을수록 생육은 부진하였으며, 종자에서도 중량(重量)이 가벼워지는 경향이었다. 2. 더덕순 채취수량(採取收量)은 3회(回) 채취구(採取區)에서 3년간 29.5MT/ha으로 가장 높았고, 가식률(可食率)은 1회 채취구(採取區)가 100%로 가장 높게 나타났다. 3. 더덕뿌리에 있어서 더덕순 채취(採取)는 무채취(無採取)에 비(比)하여 오히려 품질(品質) 및 수량(收量)의 감소(減少)를 나타내었으며, 채취가능(採取可能) 회수(回數)는 1회(回) 채취(採取)정도였고 그 이상(以上)은 수량(收量) 및 품질저하(品質低下)로 채취(채취)가 불가능하였다.

• Journal of Ginseng Research
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• 제15권1호
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• pp.31-35
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• 1991

In order to know the optimum planting density under shading structures at different light intensity, We investigated the growth status, distribution of ginseng leaf area, correlation between planting density and root weight per plant and yield, correlation between leaf area index and root weight per plant and yield. According to the increase of planting density the leaf area per plant was decreased, but leaf area index (L.A.I) was increased. Ginseng leaf population at different lines under common straw shading were distributed mainly in frost lines but polyethylene net shading at 10fo light intensity were distributed equally in all lines. Optimum planting density in common straw shading at 5% light intensity was 55 plant per tan (90 cmX180 cm) and polyethylene net shading 81 10% light intensity was 60 plant per tan, in consideration of root weight and yield. Optimum leaf area index was 2.4 under common straw shading at 5% light intensity but was 2.7 under polyethylene net shading at 10% light intensity.

• 한국작물학회지
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• 제32권4호
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• pp.425-430
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• 1987

남부지방에서 황금의 직파재배와 육묘이직 재배시 적정 파종기와 정식기를 구명하고자 시험을 실시한 결과는 다음과 같다. 1. 출현은 황금의 파종기나 정식기가 빠를수록 늦어지고 늦어질수록 단축되는 경향으로 출현일수와 파종기 및 정식기간에는 고도의 부의 상관이 인정되었다. 2. 생육은 직파재배에 있어서 4월 15 일의 파종이 초장과 경태가 크고 분지수가 많아서 가장 양호하였으며, 육묘이식재배는 4월 1일 정식이 가장 좋은 경향이었다. 3 수량은 직파담배에서는 4월 15일 파종, 육묘 이식재배는 4월 1일 정식에서 근장이 가장 크고, 건근중이 무거워 수량이 증수되었다. 4 주요 형질간 상관을 보면 수량은 초장과 분지수, 그리고 근장과 정의 상관 관계를 나타내었고, 근장은 건근중과 건경중에 고도의 정의 상관 관계가 인정되었다.

• 식물병연구
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• 제6권1호
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• pp.23-26
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• 2000

봄배추 무사마귀병의 감염시기별 피해정도를 포장시험으로 조사하였다. 정식후 감염시기가 빠를수록 수량에 대한 피해가 컸으며 정식후 20일 이전 감염배추는 수확전 완전히 고사하였고 정식후 30일에 감염된 배추는 수확시까지 외관상 건전한 생육을 보였으나 포기무게가 건전주의 59%에 불과하여 상품성이 없었다. 정식 40일 이후 감염배추는 수량에 대한 영향이 없었다. 이병배추는 감염후 시간이 경과할수록 잔뿌리의 생성이 감소되어 생육후기에는 거의 잔뿌리가 없었으며 뿌리의 신장도 건전주에 비해 1/2∼1/3 수준으로 감소하였다. 뿌리혹은 감염 20일후에 처음으로 관찰되어 이후 급속히 비대하였으며 최초 생성 20일후에 최대치에 달하였고 그후 혹뿌리의 부패로 근중이 감소하기 시작하여 수확기에는 건전주보다 낮아졌다. 뿌리혹의 발달 및 부패속도는 감염시기와 상관없이 배추생육기의 온도가 높아질수록 빨라지는 경향을 보였다. 식물체 위조는 뿌리혹이 생성된지 10일후에 처음으로 관찰되었으며 그후 10일경부터 혹이 부패하기 시작하여 열흘동안 완전히 부패 소실되었고 식물체도 고사하였다. 따라서 봄배추의 무사마귀병 포장정식시 감염은 20일간의 잠복기 20일간의 혹비대기를 거쳐 10일동안의 혹부패기, 그후의 토양내 잔존기로 구분이 가능하였다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.338-338
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• 2017

One of the problems in increasing rice production is getting lines or varieties that have high adaptability so that able to produce maximum production in a variety of environmental conditions. One strategy that can be done to get adaptive varieties is through the improvement of native varieties. This research was conducted in rain fed paddy field, Aceh province, Indonesia from June to September 2014. The texture of the soil was clay-loam with the soil pH ranged from 6.5-6.7. Five potential progenies of rice from crossing between native Indonesian rice with introduced rice varieties consist of C3, C4, S3, S5, S6 were used in this study. Besides that, one national rice variety Ciherang also used as a comparison. The plants were growth in the plot with the size of $2m{\times}1.4m$ with plant distance was $20cm{\times}20cm$. The fertilizers used in this study were Urea, NPK, and KCl. Randomized block design with 6 rice progenies/variety and 3 replications were used in this study. There were 18 experimental units and each experimental unit had 10 samples for the sources of data. The variables that were observed in this study including plant height at harvesting time, number of productive tiller, the percentage of empty grains and filled grain per panicle, weight of filled grains per hill, weight of filled grain per plot and yield potential per hectare. Analyzed were also conducted for the depth of root penetration, dry-root weight, dry-shoot weight, shoot-root weight ratio and its correlation with the weight of filled grain per hill. The research results show that there was significant difference on plant height at harvesting time, number of productive tillers, the percentage of empty grains and filled grain per panicle, weight of filled grains per hill, weight of filled grain per plot and yield potential per ha (p>0.01) among the treatments. In addition, depth root penetration, dry-root weight, dry-shoot weight, shoot-root weight ratio also had significant difference (p>0.01) among the treatment. The highest plant at harvesting time was found in S6, reaching 129.8 cm and the shortest plants was found in C3 reaching 107.5 cm. The largest number of productive tillers and the highest percentage of filled grains per panicle were found in Ciherang reaching 10.5 tillers and 80.7% respectively. Ciherang also had the heaviest weight of filled grains per hill and per plot reaching 21.1 g and 2.18 kg respectively. Whereas, S6 had the lowest number of tillers and the lowest percentage of filled grain per panicle.. The highest yield potential per ha was found in Ciherang reaching 7.79 tons. Among the progenies, S5 had the highest yield potential reaching 5 tons/Ha. The result also showed significant relationship between shoot-root weight ratio with weight of filled grains per hill. The highest value of shoot-root weight ratio (1.57) in Ciherang is thought had closed relationship with its yield potential.