• 한국작물학회지
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• 제38권4호
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• pp.297-303
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• 1993

식물생장조절제가 벼 건답직파재배시 출아 및 초기생육 촉진에 미치는 효과를 구명하기 위하여, 화성벼를 공시하고 3가지 약제를 사용하여 종자침종 또는 종자분무처리하였을 때 이들의 출아 및 초장신장에 대한 효과를 조사하여 다음과 같은 결과를 얻었다. 1. Gibberellin (GA$_3$ 4% 액제)은 건답직파재배에서 벼의 출아 및 초장신장 촉진에 현저히 효과가 없었다. 2. GA$_3$ 종자침종처리의 적정 농도는 약 100ppm이었고, 종자분무처리의 적정 농도는 약 200ppm이었다. 3. GA$_3$(200ppm)의 종자분무처리는 무처리에 비하여 출아를 1～2일 단축시켰고, 출아율이 높았으며 초장신장 효과가 인정되었다. 4. GA$_3$의 종자처리는 묘의 초엽과 엽신 및 엽초의 신장을 촉진시켰다.

• 수산해양기술연구
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• 제59권2호
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• pp.164-171
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• 2023

This study analyzed the flow inside floating seedling equipment for Scapharca subcrenata. Due to the aging society of fishing villages, it is impossible to continuously input the labor force. Therefore, it is necessary to improve efficiency. Scapharca subcrenata has high per capita consumption. It serves as an important aquatic food resource. Scapharca subcrenata culture tends to be highly dependent on the natural environment. Production of Scapharca subcrenata is difficult to predict with low stability. In the past, manpower directly installed bamboo nets in mudflats. The seedling equipment devised in this study is a floating type and can be freely moved on the sea according to the prediction of Scapharca subcrenata generation. The flow around the floating seedling equipment was analyzed by numerical analysis. The physical phenomena of the flow around the net inside the floating seedling equipment were visualized. As a result, the space between the floating seedling equipment and the bottom net and the space between the net groups showed a lower flow rate than the inlet flow rate. It is expected that the low flow rate of the floating seedling equipment will have a positive effect on the attachment of Scapharca subcrenata.

• 현장농수산연구지
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• 제16권1호
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• pp.17-24
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• 2014

Growth Chamber에서 철분코팅 벼종자와 무처리 볍씨의 발아 및 입묘 특성을 구명하기 위하여 유묘의 입모율, 경시적 입묘양상의 변화, 초장, 엽수, 근장, 근수, 생체중의 특성을 조사결과를 요약하면 다음과 같다. 1. 입모율은 철분코팅 95%, 무처리 95%로 매우 높은 결과를 보였으며, 벼 출아소요일수는 출아가 13~14일 소요되는 것으로 나타났으며, 철분코팅볍씨가 무처리 볍씨보다 전반적으로 출아가 빠르게 나타났다. 2. 벼 유묘의 초장에서는 철분코팅볍씨 4.9cm, 무처리볍씨 3.4cm로, 엽수는 철분코팅볍씨 3.8개, 무처리볍씨 3.3개로 각각 나타났다. 3. 유묘의 뿌리 철분코팅볍씨 3.8cm로 무처리볍씨 0.4cm보다 9.5배 최장 뿌리 길이가 긴 것으로 나타났으나, 뿌리수는 철분코팅볍씨 6.8개, 무처리볍씨 5.5개로 비슷한 수준으로 나타났다. 4. 유묘의 생체중은 철분코팅볍씨 107mg, 무처리 볍씨 66mg로 각각 나타났다.

• 한국작물학회지
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• 제34권4호
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• pp.428-433
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• 1989

벼 어린모 기계이앙재배의 가능성을 검토코자 소백, 대청, 화성벼를 공시, 상토종류는 전선등 인공 mat 3종류와 가행상토를 대비하였으며 어린모의 이항시 촐아장을 4수준과 유묘, 중묘, 담수토중 직파재배구를 설치, 1986년부터 1988년까지 3개년에 걸쳐 실시할 결과를 요약하면 다음과 같다. 1. 어린모 재배를 위하여 인공 mat를 개발코자 전선, 볏짚+톱밥, 대패밥+톱밥을 공시, mat 자재별로 묘생육, mat 형성정도 등을 본 결과 전선mat는 가행상토와 같이 출아가 균일하고 표생육이 양호하였으나 볏짚, 톱밥, 대패밥을 자료로 한 mat는 출아시 들뜨기 현상이 심하고 출아가 불균일 하였으며 이앙시 mat형성도 불량하여 결주율은 출아장 1cm구에서는 14％로서 많았으나 출아잘 3cm구부터는 5％ 이하로 관행중묘와 비슷하였으며 출아장이 길수록 즉 ？묘일수가 길수록 mat형성이 좋았고 결주율도 적었다. 따라서 어린모의 알맞은 출아장은 5∼8cm, 파종후 일수로 보면 7∼10일이 적당하였다. 3. 어린모의 이앙상태를 보면 이앙심도는 중묘기계이앙이 2.5∼3cm인데 비하여 어린모는 1.3∼1.8cm로 천식되었으며 주당묘수도 중묘보다 다소 많았다. 4. 파종기를 담수토중식파재배와 동일하게 하고 이앙기를 어린모는 파조후 10일, 준묘는 파종후 30일로 각각 다를 경우 본답 경수의 증가추이는 어린모 > 중묘 > 담수토중식파재배순으로 많았으며 최고분얼기는 어린모는 이앙후 50일, 중묘는 45일, 직파는 파종후 70일경에 왔으나 시기적으로 보면 7월 1일부터 10일 사이에 왔으므로 관행 중묘와 큰 차이 없었다. 5. 풀수기는 1987년부터 '88년까지 2개년간 누년성적을 보면 어린모가 중묘보다 1일, 직파재배보다는 3일 빠른 경향이었다. 따라서 어린모 조식재배의 경우는 이앙기가 빨랐서도 출수기는 중묘이앙과 차이가 없으므로 출아묘는 이앙기간이 단축되므로 중묘보다는 다소 늦게 파종하고 이앙기는 중묘 적기에 하는 냉해의 우려도 없어 좋을 것으로 생각된다. 6. 간장은 중묘보다 어린모 이앙재배에서 3∼4cm 기었는데 이는 천식이 되어 초기생육이 왕성하므로 과번무 되었기 때문으로 생각되며 지나친 천식은 태풍 등으로 도복의 위험성이 있다. 7. 수량성은 조식재배의 경우 어린모는 중묘와 비슷한 경향이며 직파재배 보다 다소 증수되었다.

• Fisheries and Aquatic Sciences
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• 제23권4호
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• pp.11.1-11.11
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• 2020

We tried to find the optimal growth conditions of sea cucumber and to analyze the economic effectiveness of the sea cucumber seedling release project in Korea. We first examined the optimal growth conditions of sea cucumber in the relating literatures. Then, we analyzed the economic effectiveness of the sea cucumber seedling release project of the Woncheon fishing village union of Gyeongnam Province in 2016-2018 by using the cost benefit analysis method. The net income of the release project of the Woncheon fishing village union was 69,850 Korean won. The benefit to cost ratio of the sea cucumber seedling release project of the Woncheon fishing village union was estimated to be 1.7, indicating that the project was economically feasible. In order to improve the economic feasibility of the sea cucumber release project, as we see in the case of the Woncheon fishing village union, it is necessary to manage the purchase of the sea cucumber seedling, to improve the recapture rate of sea cucumber, and to manage marketing of sea cucumber.

• 한국작물학회지
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• 제43권4호
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• pp.214-222
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• 1998

These experiments were conducted to investigate water uptake, electrical conductivity, germination percentage, seedling growth, and seedling establishment rate in direct seeding cultivation of rice. The rice seeds of six japonica type varieties were coated with 12 kinds of polymers in a standard concentration of 0.2% using seed coating machine. The water absorption of the polymer-coated seeds under saturation conditions was not different among varieties, and was the highest in kulcel, maltrin, and waterlock on the polymer-coated seeds. The electrical conductivity with waterlock (55.0 $\mu scm^{-1}g^{-1}$) was higher than the control plot (45.6 $\mu scm^{-1}g^{-1}$) and other treatments. The germination of the polymer-coated seeds was 95.9% at control plot, 92.7% at low temperature and 35.7% at high temperature. The total dry weight of seed decreased in the order of low temperature, control plot, and high temperature, and was effective in pvp (polyvinyl pyrrolidone), opadry, and sacrust. The seedling establishment rate in direct seeding cultivation ranged from 74.9 to 81.0% in flooded paddy surface, and ranged from 64.7 to 76.6% in dry paddy. In both cases, it decreased in the order of early, medium and medium-late varieties, but was enhanced in daran 8600, sepirect, and sacrust. According to this study the recommended polymers for direct seeding cultivation of rice are daran 8600, sepirect, and sacrust.

• 한국작물학회지
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• 제44권4호
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• pp.309-315
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• 1999

Rice seedling test was conducted to check the loging tolerance at ripening stage through evaluating the root characters. Thirteen Korean and foreign rice cultivars with direct seeding adaptable or high quality characteristics were grown in a cell pot and under submerged paddy. The root characters and pushing resistance of rice hill were determined at seedling and ripening stage, respectively. The diameter of crown root at the 7th and 8th leaf stages was thicker in lodging tolerance cultivars than those of others and showed significant-positive correlation with both pushing resistance and crown root diameter of mature plants. Also, the tensile strength of crown root at the 7th and 8th leaf stage showed highly positive correlation with the tensile strength of crown root of mature plants. The number of crown root at 7th leaf stage was significant-positively correlated with that of mature plant. The diameter of seminal root was not significantly correlated with the diameter of crown root throughout the whole growth stage. These results indicate that the diameter, tensile strength and number of crown root associated with root lodging tolerance can be detected with the seedling at about 7th or 8th leaf stage, and the seedling test using the cell pot is an useful and practical method to select lodging tolerant cultivars or lines of rice based on root characters, especially diameter of crown root.

• 한국환경복원기술학회지
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• 제9권6호
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• pp.38-51
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• 2006

This study was carried out to improve rehabilitation effect by hydro-seeding methods on denuded slopes. Lespedeza cyrtobotrya, Indigofera pseudotinctoria, Arudinella hirta, Poa pratensis, and Lolium perenne were used in this study. The results of the germination and growth characteristics by seed coating, slope control and soil mulching treatments are summarized here. Seed coating of those plants had an effect on germination ratio, germination force, $LD_{50}$, and seedling growth of stem, leaf and root. The seed coating effect was highest for I. pseudotinctoria while the seedling growth was best for L. cyrtobotrya. Vermiculite+Talcum was the best coating material for germination and seedling growth of the plants. As the slopes were steeper, germination ratio was lower and seedling growth of stem and root decreased. Lots of seeds and soils were swept away when the slope was steep. Soil mulching was effective for germination, seedling growth of stem and root, and soil stabilization. It was more effective when the slope was steeper. Coir net was the most effective soil mulching material n this study.

• 한국작물학회지
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• 제46권2호
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• pp.121-124
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• 2001

Potato (Solanum tuberosum L.) tubers of 10, 20, 30, 40, and 50 g were planted in plug trays with vermiculite-based root medium on 10 August 2000 and grown for 15 days in a glasshouse to determine the effects of mini-tuber size on plug seedling growth and field performance of plug seedlings. For a control, common potato tubers weighing 50 g were also planted. As size of seed tubers planted increased from 10 to 50 g, seedling height decreased from 24.6 to 20.0cm while shoot number per seedling increased from 2.0 to 3.5, main stem diameter from 4.3 to 6.1mm, and fresh weight of root + top from 9.3 to 19.4 g/seedling. At 90 days after transplanting plug seedlings, the total number of tubers per plant increased from 3.62 to 4.72, average tuber weight from 62.9 to 72.8g, and total tuber yield 20.5 to 23.6 t/ha with increase in seed tuber size. Plug seedlings raised from 50g tubers produced 22% more tubers per plant and had 21 % higher＞80g tuber yield than the directly planted potatoes.

• 한국작물학회지
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• 제52권2호
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• pp.134-139
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• 2007

The research was conducted with the aim of determining effects of seedling age on the yield of four fine rice varieties viz., Kalizura, Tulshimala, BRRI (Bang-ladesh Rice Research Institute)-37 and BRRI-38. The seedling of different ages such as 15, 25, 35 and 45 days were transplanted on the same day maintaining $25cm{\times}15cm$ spacing. The experiment was laid out in a randomized complete block design with three replications. The yield and yield contributing characters were influenced by seedling age, variety and their interaction. BRRI-38 gave the highest number of effective tillers $hill^{-1}$, panicle length, total spikelets $panicle^{-1}$, grains $panicle^{-1}$, 1000-grains weight and grain yield. Likewise, yield and yield contributing characters were the highest in 35 days old seedling. On the other hand, the variety (BRRI-38) with the same age as of seedlings 35 days old seedlings was found superior to other interactions, but, in the production of grains $panicle^{-1}$ and 1000-grains weight there was no significant effect in this interaction. From the findings it may be inferred that BRRI-38 with 35 days old seedlings produced the highest grain yield.