• 한국잡초학회지
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• 제12권3호
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• pp.200-222
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• 1992

The results of recent researches for improvement of seedling stand in direct seeded rice on the dry paddy in Korea were summarized as the following ; a variety to be cultivated should be chosen the characteristics of high percentage germination under low temperature, shorter period of shoot emergence, and better growth of the mesocotyl and shoots. Meanwhile, there was 40% increase in seedling stand at the treatment of removal of the seed awn under using the drill seeder. After seeding the rice seed covered with soil of 3cm depth was better seedling emergence and also there was the hightest seedling emergence at the 70% of moisture content of the soil. In addition, the application of the Release containing GA 10% enabled to increase the seedling stand and furthermore it was effective under deep seeding depth. The optimum seeding date should be seeded around May 10 when mean air temperature is above 12-13$^{\circ}C$ so that may establish more less 70% in seedling stand. Based on an appropriate seedling stand of 150/$m^2$, the optimum seeding rate was 5kg/10a. It was the best in seeding method using drill seeder and the most desirable recommended seeding method was the drill seeder in terms of seedling stand. In order to improve seedling stand water management was more effective in canal irrigation and in drainage at 6hr after irrigation following by the seeding process. On the other hand, for the increase of seedling stand under flooded condition a variety might have characters being better germination at low concentration of dissolved oxygen and vertically deeper growing of the crown root. Also, seedling stand was able to increase with the seed coating of $CaO_2$in the flooded soil. It was possible to be seeded on the early part of May being mean air temperature of avove 10$^{\circ}C$ and the optimum seeding rate was 5kg/10a. For an effective water management water would be flooded up to 3cm depth for 2-3 weeks after seeding. The rice plant grown under the direct seeded cultivation might be not so much strong in lodging resistance compared to that grown under the transplanting and moreover direct seeded rice cultivation under flooded condition would be more weak growth of the rice plant than that on dry paddy. Meanwhile, the lodging would be affected by the seeding rate, the soil depth after seeding. and seeding method even in the same variety. In particular, roots in the lodging pattern of direct seeded rice cultivation under flooded condition were largely distributed on the soil surface so that resulted easily in the lodging. In general, the lodging resistance would be greater as seeding rate and amount of N fertilizer application are lower and soil depth after seeding is higher. Among the introduction of different seeding method the high ridged drill seeding method on dry paddy soil resulted in the lowest in the lodging index and also it was lower in the drill seeding method than in the scattering seeding method under flooded condition. In case of more than 150 seedlings per $m^2$ there was a severe lodging due to high lodging index at the 3rd and 4th internodes. The effective lodging prevention was able to at the treatment of the Inabenfide at 45 days before heading and the Uniconazol at 15 days before heading which caused the shortage by 10-15cm in culm length. Also, fertilizer management using split application of nitrogen would be contributed the reduction of lodging at the rate of 20-30-20-20-10%(basal-5th leaf stage-7th leaf stage-panicle initiation stage-heading stage) on the dry paddy soil.

• 한국작물학회지
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• 제36권2호
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• pp.143-146
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• 1991

남부지방에서 자소의 직파 재배시 적정 파종기를 구명하고자 시험을 실시한 결과는 다음과 같다. 1 출현은 자소의 파종기가 빠를수록 늦어지고 늦어질수록 단축되는 경향으로 출현일수와 파종기간에는 고도의 부의 상관이 인정되었다. 2 생육은 4월 1일 파종이 경장과 경직경이 크고 분지수와 수수가 많아서 가장 양호한 경향이었다. 3 건경엽 수량은 4월 1일 파종이 경장이 크고 분지수가 많아 지상부의 생육이 양호하여 증수되었으며, 종실수량도 수당삭수와 수수가 많아 증수되는 경향이었다. 이상과 같은 결과로 보아 4월 1일 파종이 생육이 양호하여 경엽과 종실수량이 증가되어 남부지방의 알맞는 파종기로 생각된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1990년도 춘계 학술대회지
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• pp.34-35
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• 1990

• 한국작물학회:학술대회논문집
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• 한국작물학회 1986년도 춘계 학술대회지
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• pp.16-17
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• 1986

• 한국작물학회:학술대회논문집
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• 한국작물학회 1990년도 춘계 학술대회지
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• pp.32-33
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• 1990

• 현장농수산연구지
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• 제7권1호
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• pp.35-46
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• 2005

규산질비료이용 복토직파재배 개선을 위한 폿트시험 연구에서 얻어진 결과를 요약하면 다음과 같다. 본 연구에서 복토재료에 따른 초기 입모율차이는 무복토 55.0%에 비하여 복토처리로 90~100%의 높은 입모율을 보였다. 특히 파종직후 강우조건에서는 무복토 0%의 출아를 보인반면 복토처리에서는 65~100%의 입모율을 보였으며 강우 시에는 무복토 조건에서도 85%의 비교적 높은 입모율을 보였다. 특히 토양을 이용한 복토처리구에서는 강우로 인하여 20%의 매우 낮은 입모율을 보였는데 이는 수분에 의한 토양층 형성으로 산소공급 및 유모출아 조건이 불량하여 입모율이 극히 저조한 것으로 나타났다. 출수기 벼 생육은 무복토(비강우)처리구를 제외한 모든 처리구에서 비교적 양호한 벼 생육을 보였다. 벼 수량은 초기 입모 및 중간생육이 불량한 무복토(비강우) 및 토양 복토구(강우)에서 낮은 수량성을 각각 보였다.

• 한국작물학회지
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• 제37권6호
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• pp.541-549
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• 1992

벼 담수표면직파재배시 파종기 및 품종을 기상 및 재배 환경과의 관계를 구조적으로 분석하여 담수직파에서 흔히 발생하는 도복의 방상대책과 후기등숙생리를 검토한 결과는 아래와 같다. 1. 초기생육형수질중에서 출아일수는 조기파종일수록 길었으며 단립면적당 입묘수 및 입묘율은 파종이 늦을수록 그리고 만생종일수록 많고 양호하였다. 2. 단립면적당 수수는 파종이 늦을수록 감소하였으며 유효경비율은 만파인 5월 21일 파종구에서 가장 낮았다. 출수개화일수는 파종기가 늦을수록 단축되었으며 등숙기간중 강우분포는 조생종의 등숙기에 많았고 중ㆍ만생종의 등숙기에는 비교적 적었다. 파종기별 및 품종의 숙기별 포장도복정도는 파종이 빠를수록, 그리고 숙기가 빠를수록 컸다. 5. 수량 및 수량구성형질은 파종이 빠를수록 많고 양호했으며 특히 등숙비율은 그차이가 뚜렸하였다.

• 한국약용작물학회지
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• 제18권1호
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• pp.22-27
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• 2010

This study was carried out to investigate the physicochemical characteristics of 3-year-old ginseng (for Samgyetang product) cultured by various seeding density in direct-sowing culture. Ginsengs were cultured by the seeding density, 275, 300, 330 352 and 396 seeds per Kan, $180{\times}90cm$ area. Survived rate (82.1%) were the highest in plot of 352 seeds sowed, length and leaf width were high in plot of 300 and 352 seeds. Root yield grain was increased with increase of the seeding density in direct-sowing culture except 352 seeds sowed. Average root weight and diameter were the highest in plot of 352 seeds sowed, 31.6 g and 18.4 mm, respectively. Crude saponin and each ginsenosides content were the highest in plot of 275 seeds sowed. Rg1 content was decreased, Rc and Rb2 content were increased with increase of the seeding density. Total soluble sugar content was the highest in plot of 330 seeds sowed and the lowest in plot of 396 seeds sowed, and oligo- and disaccaride content were high in plot of 330 and 352 seeds sowed. Reological characteristics of ginsengs cultivated according to various seeding density, hardness and springness were high and maximum fracture force was low with decrease of the seeding quantity.

• 한국동물위생학회지
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• 제18권3호
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• pp.1-12
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• 1995

To investigate effect of seeding on post-thaw motility and viability of canine spermatozoa, the semen from male dogs which had been proved to be fertile in the past were frozen and seeded during freezing process. Post-thaw motility and viability of canine sperm which were frozen and seeded were investigated according to different seeding temperatures of $-5^{\circ}C$, $-10^{\circ}C$, or $-l5^{\circ}C$ and also according to different concentration of glycerol of 2%, 5% and 10%. In addition, post-thaw motility of canine sperm frozen by direct freezing in a deep freezer or programmed freezing in a programmed cell freezer was investigated. Post-thaw motility of canine sperm was compared according to different seeding temperatures : The sperm seeded at $-5^{\circ}C$ showed considerably higher post-thaw motility than that of non-seeding, and that seeded at $-10^{\circ}C$, or $-l5^{\circ}C$, respectively, in 2% and 5% glycerol groups on both 2 and 7day after freezing(p<0.05). In 10% concentration of glycerol, the sperm seeded at each seeding temperature showed considerably higher post-thaw motility than that of non-seeding group on day 7 after freezing(p<0.01). Post-thaw viability of canine sperm was compared according to different seeding temperatures : The sperm seeded at $-5^{\circ}$ showed significantly higher post-thaw motility than that of non-seeding, and that seeded at $-10^{\circ}C$, or $-l5^{\circ}C$, in 5% and 10% glycerol groups on day 7 after freezing(p< 0.05). In comparison of post-thaw motility of canine sperm seeded according to different concentration of glycerol, 5% glycerol group and 10% glycerol group showed considerably higher post-thaw motility than 2% glycerol group without difference between those two groups in all seeding temperatures($-5^{\circ}C$, $-10^{\circ}C$ and $-l5^{\circ}C$) on day 2 and 7 after freezing(p<0.01). In comparison of post-thaw viability of canine sperm seeded according to different concentration of glycerol, 5% glycerol group and 10% glycerol group showed the same considerably higher post-thaw viability than 2% glycerol group on each thawing day(p<0.01). The canine sperm frozen and seeded by programmed freezing method showed considerably higher post-thaw motility than that frozen by direct freezing method in all different seeding temperatures($-5^{\circ}C$, $-10^{\circ}C$ and $-l5^{\circ}$). These results indicated that the higher post-thaw motility and viability was obtained in the spermatozoa seeded than that of non-seeding, that among different seeding temperatures of $-5^{\circ}C$, $-10^{\circ}C$ and $-l5^{\circ}C$, the sperm seeded at $-5^{\circ}C$ showed higher post-thaw motility and viability than the other temperatures, also among different concentrations fof glycerol of 2%, 5% and 10%, the sperm frozen and seeded in 5% and 10% concentration of glycerol showed higher post-thaw motility and viability than that in 2% of glycerol, and that the sperm frozen and seeded by programmed freezing method showed higher motility than that by direct freezing method.

• 한국약용작물학회지
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• 제6권2호
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• pp.121-125
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• 1998

백하수오(白河首烏) 재배시(栽培時) 적합(適合)한 종묘(種苗)를 구명(究明)하고자 충북 지방재래종을 공시하여 10a당 퇴비(堆肥) 1.000kg, N - $P_2O_5\;-\;K_2O$=8 - 4 - 4kg을 시용(施用)하였고 종자직파, 1년생 종근(種根) 및 3년생 종근(種根) 등 ,3처리(處理)를 휴폭(畦幅) 50cm, 주간(株間) 10cm로 하여 시험을 수행(遂行)한 결과를 요약하면 다음과 같다. 1. 출아기(出芽期)는 3년생 종근(種根) 5월 14일에 비하여 종자직파는 3일 빨랐고, 1년생 종근(種根)은 같았으며, 만장(蔓長)은 3년생 종근(種根) 279cm에 비하여 종자직파는 16cm 1년생 종근(種根)은 26cm가 각각 길었다. 2. 뿌리굵기는 3년생 종근(種根) 1.0cm에 비하여 종자직파는 0.4cm, 1년생 종근(種根)은 0.5cm가 각각 굵었으며, 근장(根長)은 3년생(年生) 종근(種根) 32.2cm에 비(比)하여 종자직파(種子直播)는 7.2cm가 짧았고 1년생(年生) 종근(種根)은 0.6cm가 길었다. 3. 10a당 총(總) 수량(收量)은 3년생 종근(種根) 1,403kg에 비하여 종자직파는 29%, 1년생 종근(種根)은 55% 증수(增收)하였고, 상품 수량은 3년생 종(種)근 507kg에 비하여 종자직파는 14%, 1년생 종근은 17%가 각각 증수되어 백하수오(白何首烏) 재배시(栽培時) 적합(適合)한 종묘(種苗)는 직파 또는 1년간 육묘(育苗)하여 정식(定植)하는 것이 유리하였다.