• 한국토양비료학회지
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• 제49권1호
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• pp.7-11
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• 2016

Winter crops have been recognized as an alternative to soil management for fertility and crop productivity in paddy soil. Recently, rape has been produced at winter season and there is little research results on reduction of N fertilizer by adding rape residues for rice cultivation. In this study, we investigated the productivity and quality of rice by applying with 0, 27, 63, $90kg\;ha^{-1}$ of N fertilizer after input of rape residues into soil for two years. The highest yield of rice was average $4.68Mg\;ha^{-1}$ at the treatment applied with the $90kg\;N\;ha^{-1}$ with rape residue. It was reduced to N rate from 31.6 to $43.2kg\;N\;ha^{-1}$ in comparison to $4.53Mg\;ha^{-1}$ of maximum yield in treatment added $90kg\;N\;ha^{-1}$ with rape. Amylose content in rice was similar among treatments with/without rape residue, but protein content was lower in treatment with rape residue than in those without rape residue. In conclusion, input of rape residue in rice cultivation could be alternative to reduction of N fertilization and improvement of quality by adjusting rice productivity in paddy soil under cropping system.

• 한국작물학회지
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• 제46권2호
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• pp.84-88
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• 2001

Two methods of nitrogen application at the 4th leaf stage were evaluated in direct-seeding rice cultivation on dry paddy soil: one was the top dressing of nitrogen on dry paddy condition before irrigation (TNDP) for labor saving, and the other was the top dressing of nitrogen on dry paddy with mechanical rotavation of the inter-row space (TNDPIR) for increasing the efficiency of nitrogen. To evaluate these two application methods, leaf chlorophyll contents, growth characteristics and yields were compared with two conventional methods, basal application (BA) and top dressing on flooded paddy condition at the 4th leaf stage (TNFP). The SPAD value of rice in TNDP was similar with that in TNFP throughout the whole growth stage of rice. Also, there were no differences in rice growth and yield between the two methods. However, in TNDPIR, the SPAD value was the highest during tillering stage among the four application methods, and the tiller number, LAI at heading stage and the panicle number were higher than the two conventional methods.

• 한국농공학회지
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• 제42권3호
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• pp.5-17
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• 2000

The story of route of wet-rice diffusion to Korean peninsular is so far known only piecemeal. It is however commonly agreed that wet-rice technology may have spread the western coastal area in Korea from the lower and middle reaches of the yangzi river in China and to the Shandong peninsular and Bohai Bay region and was then transmitted overland to the area in Korea. Recently excavated three prehistoric paddy fields in Korea provide crucial evidence that helps to solve many of the important problems associated with technological diffusion. Research on the paddy field system and irrigation technology of prehistoric wet-rice has been so far especially productive in Japanese archaeology. Judging from the fact that the Yayoi wet-rice agricultural technology in Japan was transmitted by the Korean Strait from the southern part of Korea it is assumed that people in both regions may have practiced the same technology in prehistoric time. This paper examines three prehistoric paddy fields system(the Majon-ri site the Kwanchang-ri site and the Mujon-dong site) in relation to those of japanese data. The conclusions are as follows ; First early wet-rice agriculture in korea was limited by the level of technology and the size of labour. Secondly the location of field itself was restricted to the lower land and valley bottom area. Thirdly the layout of channel and field network is not very much different from the modern paddy field system.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1459-1463
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• 2009

The specific objective of this study was to determine the changes in grain quality of lodged rice with respect to the duration of lodging time and compare the changes with those of unlodged one. The rice 'Janganbyeo' was cultivated and half of paddy field was totally lodged at 30 days after heading. Both lodged paddy and unlodged paddy were harvested at intervals and used for the grain quality determination. The lodged rice did not show any remarkable changes in grain quality until the $4^{th}$ day of lodging for rough rice and until the $2^{nd}$ or the $4^{th}$ day of lodging for brown rice and white rice. The overall grain quality of lodged rice could be kept for 2 to 4 days of lodging.

• 한국농공학회논문집
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• 제62권3호
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• pp.39-49
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• 2020

Rice paddy cultivation is one of the major sources in methane (CH₄) emission of which accurate assessment would be a prerequisite for agricultural greenhouse gas management. Biomass treatment in paddy fields is an important factor that affects CH₄ emissions and thus needs to be taken into account. The objectives of this study were to apply drone images to investigate organic matter practices and to incorporate into the estimation of CH₄ emissions from paddy fields. Three study areas were selected by one from each of the three different regions of Yeongnam, Honam and Jungbu, which are the most active region in paddy cultivation. The eBee drone was used to take images of the study sites twice a year; Jul mid-season for identifying rice cultivation area; Jan for investigating rice straw management and winter crop cultivation. Based on biomass management practices, different emissions factors were assigned on an individual paddy field and CH₄ emmisions were estimated by multiplying respective areas. The ratios of rice straw application and winter crop cultivation were 1.4% and 37.2% in Hapcheon, 1.3% and 19.8% in Gimje, and 0.0% and 0.5% in Dangjin, respectively. The CH₄ emissions estimates for respective sites were 0.40 ton CH₄/year/ha, 0.34 ton CH₄/year/ha, and 0.29 ton CH₄/year/ha. On average, estimated CH₄ emissions of this study were 28.5% less than the current Tier 2 CH₄ emission estimation method.

• 한국농림기상학회지
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• 제19권4호
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• pp.293-303
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• 2017

이 연구의 목적은 가뭄이 쌀 생산성에 미치는 효과를 추정하는데 있다. 가뭄 효과를 추정하기 위해서 우리는 기상변수와 수리답 비율 등이 쌀 생산성에 미치는 효과를 패널 회귀분석 모형을 통해 추정하였다. 분석결과 가뭄이 쌀 생산량에 미치는 영향은 통계적으로 유의한 것으로 나타났다. 또한, 전체 논면적에서 수리답 면적 비율이 1% 확대될수록 쌀 생산량은 0.025~0.035%씩 증가하는 것으로 나타났다. 하지만, 한발대비 수리답 면적 비중의 교차항이 쌀 단수에 미치는 영향은 매우 작은 것으로 추정되었다. 이는 한발대비 수리답이 가뭄 피해를 줄이는 데에는 효과가 거의 없음을 의미한다. 또한 추세항과 연도별 더미를 추가하였을 경우, 한발대비 수리답 면적 비중이 쌀 단수에 미치는 영향과 한발대비 수리답의 가뭄 피해 억제 효과는 통계적으로 유의하지 않은 것으로 추정되었다. 이는 수리안전답 조차도 표준강수지수(SPI6)가 -2.5이하로 떨어지는 심각한 가뭄의 피해를 줄이는 데에는 큰 효과가 없음을 의미할 수 있다. 따라서 50년 이상 노후화된 시설이 전체 약 74%에 육박하는 농업용 수리시설의 경우, 기후변화로 인한 가뭄의 빈도와 강도 증가에 더욱 취약할 것으로 예상된다.

• 한국식품과학회지
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• 제50권2호
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• pp.138-142
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• 2018

재배조건에 따른 차이를 보기 위해 논에서 재배되는 논쌀 두종과 제주밭쌀의 특성과 중금속 함량을 비교하였다. 두 논쌀 중 아밀로오스 함량이 높은 논쌀 2와 제주밭쌀은 높은 페이스팅 온도와 낮은 최고 점성, 그리고 상대적으로 높은 셋백(setback)을 보였으나, 재배조건에 따른 차이를 보이지는 않았다. 제주밭쌀은 짙은 노란색과 낮은 점성을 보여 외관과 기계적 식미치에서 논쌀보다 낮게 평가되었다. 중금속 중 카드뮴과 납은 논쌀과 밭쌀의 차이를 보이지 않았으나, 총 비소함량의 경우 제주밭쌀은 논쌀의 10.1-17.9%에 해당하는 양을 보였다. 또한 제주밭쌀의 무기비소함량도 논쌀 2의 무기비소함량의 15% 정도에 불과한 것으로 나타났다. 논쌀을 침수, 취반, 뜨거운 물로 씻어내리기 등의 처리에 의해 무기비소 함량을 각각 34.1, 23.8, 17.5% 줄일 수 있는 것으로 나타났으나, 제주밭쌀의 경우 무기비소함량이 매우 적어 처리에 의한 유의적 차이는 발견되지 않았다.

• 농약과학회지
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• 제12권1호
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• pp.74-81
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• 2008

벼 재배 환경에서 농약의 분포 및 유출특성과 농업환경으로의 노출성을 구명하기 위해서 살포농약의 제형과 벼 생육단계에 따른 경시적 분포양상 실험을 수행하였다. 벼 이앙전 처리제로 제초제인 butachlor 유탁제와 oxadiazon 유제의 논물 중 잔류양상은 처리 3일 후에 초기처리량의 90%이상이 소실되는 것으로 나타났고, 벼 이앙 후 15일 이내에 처리한 butachlor, thiobencarb 및 molinate 입제의 농약성분의 95%이상이 논물과 토양에 분포되어, 비살포 지역으로 유출을 방지할 수 있는 유출안전기간은 농약살포 후 5일로 설정하였다. 벼 생육 중기에 살포된 iprobenfos 입제, tricyclazole 수화제, phenthoate 유제의 처리직후 2시간 후의 분포는 논물에서 16.1, 48.9와 38.9%, 토양에서 83.6, 15.4와 10.7%, 식물체에서 는 0.3, 35.7과 50.4%가 각각 분포되었다. 또한 벼생육 후기 농약분포는 tricyclazole 수화제와 Phenthoate 유제는 논물에서 7.8과 9.8%, 토양에서 21.7과 5.1%, 식물체에서 70.5와 85.1%가 각각 분포되어 식물체 biomass가 증가 할수록 농약 부착량이 식물체에 분포되어 논물과 토양에 적은 양이 분포되었다.

• Applied Biological Chemistry
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• 제40권4호
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• pp.342-346
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• 1997

전라북도 군산시 연안에 위치한 공업단지의 여러 제조업체에서 배출되는 매연, 분진의 영향으로 토양오염이 우려되는 지점을 선정하여 논 토양과 현미 중 중금속함량 및 오염원들과 현미 중 중금속함량간의 상관관계를 조사하였다. 공업단지 인근 지역 논 토양 중 전중금속 평균함량은 Pb 34.33, Cd 0.50, Cu 35.49, Zn 71.67 mg/kg이었으며 제조업체별, 거리별 논 토양 중금속의 분포상태를 조사한 결과 제조업체별, 거리별로 중금속함량이 일정한 경향을 보이지 않았다. 현미 중 중금속 함량은 Pb 1.74, Cd 0.07, Cu 3.54, Zn 16.53 mg/kg이었다. 군산 공업단지 인근 논 토양중 0.1N-HCl 가용성 중금속함량과 현미 중 중금속함량과의 상관관계를 보면 Pb가 1% 유의수준에서 정의 상관율$(r=0.6853^{**})$, Zn이 5% 유의수준에서 정의 상관$(r=0.5420^*)$을 보였으며, 토양 중 전 중금속함량과 수도체 현미 중 중금속함량과의 상관관계를 보면 Pb만이 1% 유의수준에서 정의 상관$(r=0.7131^{**})$을 보였다. 군산 공업단지 인근 논토양과 현미 중 중금속 함량은 공업단지에서 배출되는 매연이나 분진 중에 함유되어 있는 중금속 오염물질의 영향을 받아 부분적으로 오염이 진행되고 있으나 아직 오염을 우려할 수준에까지 이르지는 않았다.

• 현장농수산연구지
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• 제9권1호
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• pp.91-104
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• 2007

The special project was conducted at the cooperative farm where located at Yakjeon-ri Sukcheon-gun Pyeongannam-do, the Democratic People's Republic of Korea. This farm was firstly introduced a newly developed technology-"Bokto seeding technology" for rice cultivation from the Republic of Korea. Total acreage of rice paddy field cultivated by this technology was 800ha and the average yield was 7.17t/ha with paddy rice which was higher by 109.2% than that of the transplanting method for rice cultivation. In general rice disease was decreased at the Bokto seeded rice plant compared to the transplanted rice plant and root activity was higher in Bokto seeded rice. Optimum seeding amount was determined at rate of 90kg/ha in Pyeongdo 5(early ripening variety) and 110kg/ha at Pyeongdo 11(medium ripening variety) and Pyeongyang 43(late ripening variety), respectively. A recommended sowing time was within late April for late ripening variety like Pyeongyang 43, May 1-5 for medium ripening variety, and May 5-15 for early ripening variety.