• Weed & Turfgrass Science
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• 제2권4호
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• pp.348-351
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• 2013

본 연구는 벼 무논점파재배에 따른 잡초성벼 발생율을 담수산파 및 기계이앙재배와 비교하고, 무논점파와 담수산파재배포장을 기계이앙으로 전환하였을 때 잡초성벼 발생양상을 알아보기 위하여 실시하였다. 2년 연속 무논점파 및 담수산파 재배할 경우, 잡초성벼 발생은 기계이앙보다 각각 2.5배 및 12배 증가하였다. 그리고 3년간 연속하여 무논점파와 담수산파로 재배한 논에서 잡초성벼는 기계이앙보다 각각 4.2배, 4배 증가하였다. 무논점파 및 담수산파를 3년간 연작 후 기계이앙 재배로 전환한 논에서 잡초성벼 발생은 전년도에 비해 각각 0.3배, 0.7배 감소하여, 담수표면산파보다 무논점파에서 감소율이 더 큰 것으로 나타났다. 기계이앙재배로 3년간 연작한 포장을 다음해 무논점파와 담수산파하였을 경우는 잡초성벼 발생이 각각 전년도에 비해 0.8배, 1.1배로 기계이앙재배시에 비해 증가하지 않았다. 이와 같은 결과로 보아 잡초성벼 발생을 최소화하기 위해서는 직파재배 할 경우 담수산파보다는 무논점파가 유리하나 2년 이상 연작은 피하고, 기계이앙재배와 무논점파를 번갈아 하는 것이 잡초성벼 발생을 줄이는 재배방법으로 생각된다.

• 농촌지도와개발
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• 제24권2호
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• pp.99-115
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• 2017

The purpose of this study is to analyze potential adoption rates and reusing patterns of the new rice direct seeding technology. The model constructed and employed in this study is a system dynamics model of farmer adoption and reusing patterns for this new technology over time. The model incorporates a causal loop diagram that explains interactions among rice cultivation subsystems with feedback loops and further attempts to build a causal loop model with stock-flow diagram for computer simulation. As one example of how the model can be used to provide insight to rice farmers, simulations are run over varying levels on the cultivation process of rice. The major finding is to demonstrate the utility of system dynamics simulation methodology in aiding the rice wet direct seeding farmers' decision making.

• 한국작물학회지
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• 제44권2호
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• pp.97-101
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• 1999

No-till direct seeding cultivation of rice has major advantages such as saving of labor and cost by eliminating tillage, preparation of seed bed and trans-planting procedure compared to the conventional transplanting cultivation. A field experiment was conducted to evaluate the effects of straw treatment and nitrogen levels on the rice growth in no-till direct-seeding cultivation. Rice straw, vetch straw, and the mixture of both of the straws were mulched on the surface of soil before seeding while 4 levels of nitrogen fertilizer, 0, 7, 9, and 11 kkg/10a respectively, were applied at 3 split times, 3-weeks after sowing, 5-weeks after sowing and the panicle initiation stage. Mulching of vetch straw significantly reduced seedling establishment of rice which may be attributed to low oxidation-reduction potential of soil by vetch mulching treatment. Vetch straw increased the concentration of soil ammonium leading to an extension of the greenish leaf to panicle initiation stage. Agronomic nitrogen use efficiency (AD $E_{N}$) in heavy-mixed straw mulching plots was lower than other treatments. Grain yield and AU $E_{N}$ in the vetch treatment were less affected by fertilized N levels. Conclusively, it is suggested that heavy straw mulching was not efficient for rice seedling establishment and nitrogen usage.e.

• 한국작물학회지
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• 제50권6호
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• pp.384-386
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• 2005

벼 품종의 직파적응성을 평가하기 위하여 입모율이 높은 ASD1 품종과 비교적 낮은 IR72품종에 대한 종자의 발아기간 중 공기와 질소 충진상태에 따른 sugar와 starch 함량의 변화를 검토하였다. 1. 공기 충진상태와 질소 충진상태에서 직파적응성이 높은 ASD1 품종은 비교적 낮은 IR72 품종보다 발아기간 중 starch 함량이 높았으며 두 품종간 starch 감소 패턴이 상이하였다. 2. 공기 충진상태와 질소 충진상태에서 직파적응성이 높은 ASD1 품종은 비교적 낮은 IR72 품종보다 발아기간 중 sugar 함량이 높았으며 두 품종간 sugar 증가 패턴은 같은 경향이었다. 3. ASD1 품종은 IR72 품종보다 공기와 질소를 계속 충진하거나 주기적으로 주입 또는 질소 충진후 공기를 보충하는 조건 등의 어떠한 충진조건에서도 발아경과에 따른 sugar 함량이 높았다.

• 농업과학연구
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• 제42권2호
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• pp.87-92
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• 2015

This study was conducted to evaluate the herbicidal efficacy of carfentrazone-ethyl mixtures in direct-seeding flooded rice. The efficacy of three different carfentrazone-ethly mixtures was greater than pyrazosulfuron-ethyl pyriminobac-methyl GR (PP GR). Weeding efficacy of three different carfentrazone-ethly mixtures was more than 96.9%. No phytotoxic effect was observed in the rice based on the plant height and the number of tillers. Yield of rice un three different carfentrazone-ethly mixtures application was more than both in the PP GR and in the hand weeding. Based on these data, three different carfentrazone-ethly mixtures can be applied to provide an effective weed management in direct-seeding flooded rice.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.261-261
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• 2017

This study was carried out to provide basic data for spreading rice direct seeding by inducing stabilization of seedlings, yield and quality according to sowing times in rice direct seeding cultivation. In 2016, 'Sukwang' was seeded 3 times by 10 days interval on May. 10, 20, 30 and 6kg/10ha of seeding rate respectively in Iksan. In summary, the number of rice seedling establishment was higher than the optimum seedling establishment level at all sowing periods and the seeding rate was better as the sowing period was delayed. Weed development by sowing was the highest at early sowing, May 10, and decreased at late sowing. Heading dates were delayed by 3days for sowing on May 10, 7days for sowing on May 20, and 11 days on sowing on May 30. Rice yield increased with the delay sowing time and compared to the transplanting. It was 84% in sowing on May 10, 94% in sowing on May 20, and 99% in sowing on May 30. In addition, head rice ratio and head rice yield increased according to delayed of seedling.

• 한국작물학회지
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• 제37권1호
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• pp.9-15
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• 1992

벼 담수직파재배법 확립을 위하여 질소시비수준, 생장억제제, 그리고 파종밀도를 달리하여 담수표면직파재배 실험을 실시한 결과를 요약하면 다음과 같다. 1. 질소 시비 수준, 파종 밀도에 따른 수량의 변이에는 처리간 아무런 유의한 차이를 보이지 않았는데 그 원인은 심한 도복 발생으로 생각된다. 2. 생장조절제 PP333의 처리에 의한 간장은 3-4Cm 짧아졌으나 이것이 도복억제에는 크게 기여하지 못했다. 3. 담수표면직파의 경우 단위 면적당 영화수를 최대로 하는 적정파종량은 6Kg 종자 / 10a 수분이었다. 4. 담수표면 직파 재배에서 안정된 수량을 얻기 위해서는 도복 억제가 필수적이며 이는 재배법을 통해서 보다는 도복 저항성 품종의 개발을 통해서 가능 할 것으로 생각된다.

• 한국작물학회지
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• 제36권4호
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• pp.324-331
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• 1991

벼 침수직파재배법 확립을 위해 파종량과 산소 발생제 처리를 달리하여 침수토중직파재배 싱험을 실시한 결과를 요약하면 다음과 같다. 1 침수토중직파에서 CaO$_2$ 분의처리나 CaO$_2$와 규조토의 혼합 의처리는 입모율은 크게 향상 시켰으나 $m^2$당 개체수가 증가함에 따라 도복발생 정도가 심해져 수량증대에는 크게 기여하지 못했다 2. 침수토중직파에서 적정파종량과 1주 파종입수는 CaO$_2$ 분의처리에서는 3.3Kg종자/10a와 1주 3입파였고 산소발생제 무처리의 경우 5.6Kg 종자/10a와 1주 5입파였다. 3. 경로 계수 맥석의 결과에 의하면 수량에 대하여 등숙률의 직접 효과가 가장 커 도복 억제를 통한 등숙률의 향상이 침수 토중 직파 재배의 수량 증대에 가장 중요한 것으로 생각된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.192-192
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• 2017

Direct-seeding cultivation of rice is increasing in Asia instead of transplanting system, because of its lower cost and operational simplicity. Low-temperature germinability (LTG) and anaerobic germinability (AG) are important characters for breeding of varieties for wide-spread adoption of direct-seeding cultivation in rice. This study was performed to characterize LTG and AG of seven rice varieties and identify varieties with strong germinability on both low-temperature and anaerobic conditions. The mean germination rate and germination vigor of seven varieties were 51.7% and 6.0 under low-temperature condition, respectively. Among these varieties, Cheongcheongjinmi and Hwanggeumnodeul had the highest germination rate of 80%, indicating that Cheongcheongjinmi and Hwanggeumnodeul have a good LTG. In anaerobic conditions, the germination rate and coleoptile length for all varieties were 47.6% and 3.2 cm, respectively. Of them, the highest germination rate and coleoptile length were observed in Subo and Hopum, respectively, suggesting that these two varieties are tolerant to anaerobic during germination stage. Molecular characterization by SDS-PAGE revealed that the protein patterns differed at 50 kDa, 40 kDa, and 22 kDa between low-temperature and anaerobic conditions. Varieties identified as good LTG or AG in this study may be used for developing new direct-seeding rice cultivars through pyramiding these traits in the breeding program.

• 한국약용작물학회지
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• 제22권1호
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• pp.17-22
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• 2014

Ginsenosides of roots in Panax ginseng were analyzed by metabolic-targeting HPLC using the partial least squares discriminant analysis (PLS-DA) and compared depending on sowing methods between direct seeding and transplanting method. Score plots derived from PLS-DA could identify the sowing method between the direct seeding and transplanting method in P. ginseng roots. The ginsenoside compounds were assigned as Rg1, Re, Rf, Rg2, Rb1, Rc, Rb2, Rb3, and Rd. Contents of Re, Rf, Rg2, Rb1, Rc, Rb3, and Rd of main roots produced from the transplanting method were relatively higher than those of samples produced from direct seeding method. Also, contents of Rg1, Re, Rf, Rg2, Rb1, Rc, Rb2, Rb3, and Rd of lateral roots from the transplanted samples were relatively higher than those of samples produced from direct seeding method. Therefore, HPLC with PLS-DA analysis can be a straightforward tool for identification of ginsenosides in main or lateral roots of P. ginseng obtained from two different seeding methods between direct and transplanting methods.