• 농업과학연구
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• 제49권2호
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• pp.357-366
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• 2022

Biochar can be obtained by using various types of biomass under an oxygen-limited condition. Biochar can be utilized for various applications such as soil improvement, waste management, growth promotion, and adsorption. Wood vinegar is produced by the process of pyrolysis wood biomass and is used as a growth promoter, for soil improvement, and as a feed additive. When wood vinegar is treated on soil, it acts to control soil pH, improve nutrient availability, and alleviate N₂O and NH₃ volatilization. The objective of this study was to evaluate the effect of biochar and wood vinegar on the growth of perilla and soil quality. The experiment was conducted by using a Wagner pot (1·5,000 a^-1) in a glass greenhouse. The biochar was produced by pyrolysis at 450℃ for 30 minutes using rice husk and rice straw. Wood vinegar was diluted to 1 : 500 (v·v^-1) and used in this experiement. In the results of a cultivation experiment, co-application of biochar and wood vinegar enhanced the growth of perilla. In particular, rice husk biochar affected the leaves of the perilla, and rice straw biochar influenced the stems of the perilla. In addition, soil quality after treatment with biochar and wood vinegar applied together was highest compared to other units. Therefore, it is anticipated that co-application of biochar and wood vinegar will be more productive and improve soil quality compared to individual utilization of biochar and wood vinegar.

• 한국유기농업학회지
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• 제2권1호
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• pp.24-28
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• 1993

Even though the price level of organic rice is 20% higher than conventional product, 25% of the total surveyed consumers are willing to purchse organic rice of different income level, the monthly average income was 1, 100, 000Won. 35% of the total consumers in this income class is willing to purchase organic rice.

• 한국유기농업학회지
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• 제25권1호
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• pp.23-35
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• 2017

The objective of this study is to analyze a price of environment-friendly and conventional rice with POS data. And we estimate the value of environment-friendly's certification with hedonic price model. In case of price level, organic and pesticide-free rice is higher than conventional rice, 22.5% and 10.6%, respectively. In contrast, price variation of conventional rice is higher environment-friendly rice. The value of organic and pesticide are 839.5 Won and 313.7 Won, respectively. As time goes by, the certification's value goes down in environment-friendly rice. In particular, price level and certification's value of pesticide-free rice is similar with conventional rice. The results of this study show that price of the environment-friendly rice is not higher than expected. Therefore it is necessary to establish a new marketing and promotion strategies for environment-friendly rice.

• 현장농수산연구지
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• 제4권1호
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• pp.39-44
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• 2002

This paper was studied on a strategy in rice production under New round system of WTO(World Trade Organization) in Korea. Under enactment of New round system in WTO rice will be opened at the world market and thus rice growers will compete with this marketing system. In this regard, rice industry in Korea would be "a theory of rice triangle" such as high quality, low cost, and environmental friendly system. High quality rice would be obtained through a cultivar, cultivation technology, and quality control(QC) to compete against oversea's dealer. Lower cost in rice production should be concentrated into rapid decrease in rural population and into introducing for young generation. Rice cultivation has been played major role in this peninsula in terms of a preservation of water resource, fresh air and prevention of soil erosion.

• Journal of Crop Science and Biotechnology
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• 제10권4호
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• pp.243-248
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• 2007

Rice is a facultative short-day plant that flowers in response to reduced day lengths. This study was conducted to identify quantitative trait loci(QTL) for the early heading date(EHD) using H143 line showing extreme EHD compared to other regular cultivars in rice. The japonica H143 was crossed with a japonica cultivar 'Dongjinbyeo' as well as a tongil cultivar 'Milyang23' to measure the inheritance mode of EHD and identify major QTL conferring EHD, respectively. Pooling test revealed that segregation distortion occurred on chromosome 7 and subsequent linkage map was constructed using 10 SSR markers. QTL analysis using Q-gene 3.06 revealed that the EHD trait in H143 was largely controlled by two major QTL, EH7-1 and EH7-2, accounting for more than 40% of genetic variation that were closely related to the previously reported QTL, Hd4 and Hd2, respectively. This result suggests that these two QTL markers may be a useful source for the control of heading date in rice breeding programs.

• Applied Biological Chemistry
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• 제37권2호
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• pp.72-76
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• 1994

고미의 효율적 소비방법에 관한 연구의 일환으로 열풍식 팽화기($210{\pm}5^{\circ}C$, $55{\pm}5\;sec.$)를 이용하여 나락의 팽화 특성을 벼의 형태와 품종별로 비교하였다. 열풍에 의한 팽화효과는 나락이 현미나 백미에 비하여 월등하게 우수하였고 형태별 팽화된 전분의 상대적 결정화도 역시 나락이 백미나 현미보다 매우 낮았다. 팽화나락과 현미의 팽화체적 증가율은 찰벼가 메벼에 비하여 높았으며 팽화적성은 운봉올찰벼와 진주벼가 양호(P=0.05)하였다. 최대 팽화력을 나타내는 나락의 수분함량은 $10{\sim}12%$이었다.

• 한국작물학회지
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• 제51권1호
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• pp.14-25
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• 2006

Response of grain yield and milled-rice protein content to nitrogen (N) rates at various growth stages is critical for quantifying real-time and real-amount of applied N requirement for target grain yield and protein content. An experiment including 10 N rate treatments at transplanting, tillering and panicle initiation stages with four rice cultivars in 2003, 6 N treatments with two rice cultivars in 2004 and 2005 was conducted. Increase of N rates at PIS significantly increased both grain yield and milled-rice protein content but increase of N rates at tillering stage significantly increased grain yield but not milledrice protein content. Therefore, high grain yield and low milled-rice protein content would be difficult to obtain only by adjusting N rates at PIS. Internal N use efficiency (INUE) was 60.5 kg grain/kg N accumulation on an average over N treatments, cultivars, and experimental years, showing considerable reduction especially at high shoot N accumulation in the experimental year of low sunshine duration. Milled-rice protein content tended to increase almost linearly with increasing shoot N accumulation, but it revealed big variation even at the same shoot N accumulation at harvest. Milled-rice protein content decreased with increasing INUE. N accumulation in the milled rice increased at an almost constant proportion of 45.5 percent of the shoot N accumulated at harvest, showing slight decresing proportion with the increasing shoot N accumulation.

• 한국작물학회지
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• 제51권spc1호
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• pp.67-72
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• 2006

본 시험은 벼 질소 소비 재배시 생육 및 쌀의 품질에 미치는 영향을 구명하기 위하여 일품벼 등 18종을 공시하여 관행 질소량 11.0 kg/10a와 소비 질소량 5.5 kg/10a로 구분하여 수행한 주요 결과는 다음과 같다. 소비 재배시 관행 재배에 비해 출수기는 1일 빠르거나 같았고, 초장은 $1{\sim}7cm$ 정도 작았으며, 경수, SPAD 치는 같거나 비슷한 경향이었다. 지상부 건물중은 새계화벼가 5.5kg/10a 시용시 주당 5.7 g적어 가장 큰 감소를 보였다. 수량은 470 kg/10a 이상 생산할 수 있는 품종은 일미벼, 남평벼, 신동진벼, 동진1호, 동안벼였다. 그러나 소비재배시 관행에 비해 수량 감소가 13% 이상 큰 품종은 주남벼, 동안벼였으며 수량 감소가 적은 품종은 수라벼, 화영벼 등이었다. 쌀 품위 및 식미 향상 품종은 화영벼, 추청벼, 일미벼, 일품벼 등 11품종이었다. 소비재배해서 쌀 수량 및 식미가 좋은 유망 품종은 동안벼, 일미벼, 일품벼, 동진1호, 새추청벼, 새계화벼였다.

• 한국작물학회지
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• 제56권4호
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• pp.329-341
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• 2011

The objective of this study was to determine the genetic diversities of major rice blast resistance genes among 84 accessions of aromatic rice germplasm. Eighty four accessions were characterized by a dominant 11 set of PCR-based SNP and CAPS marker, which showed the broad spectrum resistance and closest linkage to seven major rice blast resistance (R) genes, Pia, Pib, Pii, Pi5 (Pi3), Pita (Pita-2), and Pi9 (t). The allele specific PCR markers assay genotype of SCAR and STS markers was applied to estimate the presence or absence of PCR amplicons detected with a pair of PCR markers. One indica accession, Basmati (IT211194), showed the positive amplicons of five major rice blast resistance genes, Pia, Pi5 (Pi3), Pib, Pi-ta (Pi-ta2), and Pik-5 (Pish). Among 48 accessions of the PCR amplicons detected with yca72 marker, only five accessions were identified to Pia gene on chromosome 11. The Pib gene was estimated with the NSb marker and was detected in 65 of 84 accessions. This study showed that nine of 84 accessions contained the Pii gene and owned Pi5 (Pi3) in 42 of 84 accessions by JJ817 and JJ113-T markers, which is coclosest with Pii on chromosome 9. Only six accessions were detected two alleles of the Pita or Pita-2 genes. Three of accessions were identified as the Pi9 (t) gene locus.

• 식품산업과 영양
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• 제22권1호
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• pp.38-44
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• 2017