• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.479-484
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• 1999

Rice crop has relatively short growing season during the summer in Korea and, therefore, it is often difficult to acquire cloud-free imagery on time. This study was attempt to define the temporal characteristics of radar backscattering observed from satellite L-band SAR data on different growing stages of rice crop. Six scenes of multi-temporal JERS SAR data were obtained from the transplanting season to the harvesting month of October. Six layers of multi-temporal SAR data were registered on a common geographic coordinate system. Using topographic maps, field collected data, and Landsat TM data, several sample rice fields were delineated from the imagery and their relative radar backscatters were calculated by using a set of reference targets. The temporal pattern of radar backscattering was very distinctive by the growing stage of rice crop. It was also separable between two types of rice fields having different cultivation practices. Considering the temporal characteristics of radar backscattering observed from the study, it is obvious that a certain date of the growing season can be more effective to delineate the exact area of the cultivated rice crop field.

• 한국가금학회지
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• 제34권2호
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• pp.85-90
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• 2007

한국 재래닭에서 성장에 따른 유전자들의 발현 변화를 알아보고 성장 촉진, 대사 및 면역 관련 유전자를 발굴하기 위하여 주령별로 닭의 간에서 RNA를 추출하였으며 10개의 arbitrary ACPs를 이용하여 차등 발현되는 유전자를 조사하였다. 발현량에 현저한 차이를 보이는 5개의 유전자들이 선별되었으며, 이 중 3개의 유전자들은 BLAST search 결과 이미 기능이 알려진 FTH1, SAA와 HSP90B1으로 밝혀졌다. 그러나 2개의 유전자들은 닭의 genome sequence가 끝났음에도 불구하고 기능이 밝혀져 있지 않아 앞으로 이 유전자들의 기능에 대한 연구가 지속되어야 함을 의미한다. 본 연구에서 닭의 간에서 성장 단계별로 발현 차이를 보이는 유전자들은 앞으로 다른 유전자와 단백질들과의 관계를 통하여 닭의 성장 및 지방 대사를 이해하는데 도움을 줄 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권5호
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• pp.651-654
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• 2006

An experiment was conducted to investigate amino acid composition of three tropical legumes (Cooper (Glycine wightii), Tinaroo (Neonotonia wightii) and Siratro (Macroptilium atropurpureum)) at two different stages (pre-blooming and blooming stages). Chemical composition and totally 16 amino acids of these plants were analysed for comparison of their composition among species at different growing stages and characterizing the amino acid pattern of these legumes. Crude protein content of the plants ranged from 16% to 27% on a dry matter basis. The total amount of 16 amino acids analyzed in this experiment was highest at 89.7 mg/16 g N in Cooper at pre-blooming and lowest at 80.9 mg/16 g N in Glycine at blooming stage. Total amount of amino acids in each legume species tended to slightly decrease with their maturity but no statistical difference was found. The percentage of aspartic acid, glutamic acid and proline in the total amount of amino acids was dominant at 9% to 13%, and that of methionine was less than 1.6%. In this experiment it was concluded that three tropical legumes were rich in crude protein content and characterized by 16 different amino acids with lower sulfur-containing amino acid as methionine.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1994년도 춘계 학술대회지
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• pp.144-145
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• 1994

• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.1-7
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• 1998

To investigate the water balance in a paddy rice field with the pumping station for irrigation water supply, flow measurements and analysis on various components of water balance were carried out. The investigated area is 103.7 ha, and the irrigation water was supplied for 102 days during the total irrigation period starting from June 1. It was found that the consumption rate was increased as the growing stage was progressed. The variation of evapotranspiration rate was shown same tendency as the consumption rate, while no apparent tendency was found in infiltration rate upon different growing stages. And the ground water input to the area was predominant during the early stage of growing period, while ground water output from the study area was predominant at the end of the growing stage. The range of return flow rate, the ratio of total outflow to total inflow in every decad, was 57.6 to 85.7%. These values are slightly higher than reported values from the other investigation projects.

• 한국초지조사료학회지
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• 제24권1호
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• pp.53-60
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• 2004

Recently, there has been a growing tendency to use whole crop rice for feeds as there is an increased rice supply and a decrease in the demand for rice in Korea. Little information, however, is available about the management and utilization of whole crop rice for feeds. This study was conducted to decide the optimum harvest date through examining the plant height, dry matter(DM) yield and feed composition of whole crop rice harvested at different maturity. Field study was established early in May until October 7th on a rice field at Yupori, Sinbuk-yeup, Chunchon, Kangwon-Do. "Ilpum" mutant rice was sown at 52 kg/ha, and N, P and K were applied at 209, 113 and 81 kg/ha, respectively. The rice was harvested at six different mature stages for analysis; booting stage; 17 Aug., milk-ripe stage; 27 Aug., dough stage; 7 Sep., yellow ripe stage; 17 Sep., dead ripe stage; 27 Sep. and full ripe stage; 7 Oct. Plant height was 77 cm in booting stage (P<0.05) which was lower when compared to the other stages among which the heights did not differ with average range of 93∼97 cm. The highest dry matter yield was observed in yellow ripe stage (22.8 T/ha), which was followed by dead ripe stage (19.3 T/ha), full ripe stage (19.3 T/ha), and dough stage (15.1 T/ha). Crude protein (CP) and Neutral detergent fiber (NDF) concentrations consistently decreased with maturity. The highest concentrations of CP and NDF were obtained in booting stage with 9 and 73.6%, respectively (P<0.05), and lowest in full ripe stage with 5.8 and 64.6%, respectively (P<0.05). The concentration of total digestible nutrient (TDN) was highest in booting stage (59.7%); however no significant difference was found among other stages. The concentrations of Ca and P were not different among mature stages. According to these results, the yellow ripe period is appropriate to harvest the whole crop rice for forage considering dry matter yields, feed compositions and TDN concentrations.

• Animal Bioscience
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• 제34권9호
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• pp.1491-1498
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• 2021

Objective: This research was carried out to investigate the effects of corn particle size on the apparent total tract digestibility (ATTD) of energy and nutrients fed to pigs at four different growth stages and therefore to provide basis for better application of corn in pig feeds. Methods: Eighteen weanling piglets, 18 growing barrows, 24 gestating sows and 24 lactating sows were used in this study. Within each stage, pigs were allotted to 1 of 3 or 4 corn-soybean meal diets which were formulated with different corn particle size in a completely randomized design with 6 replicate pigs per diet. Each stage lasted for 19 days, including 7 days for cages adaptation, 7 days for adaptation to diets and followed by 5 days for total collection of feces and urine. Results: For nursery and growing stages, the results showed that digestible energy content and ATTD of gross energy (GE), dry matter (DM), neutral detergent fiber (NDF), and acid detergent fiber (ADF) was increased (p<0.05) as the corn particle size reduced. Meanwhile, the metabolizable energy content and ATTD of crude protein (CP) tended to increase. For gestating sows, no differences were found in the ATTD of nutrients among dietary treatments. As for lactating sows, there were linear and quadratic increases (p<0.05) in the ATTD of DM, GE, NDF as the corn being finer milled. Quadratic response in ATTD of ADF and CP (p<0.05) were observed as sows fed with four different diets. Conclusion: Reducing corn particle size can increase digestibility of nutrients fed to young pigs and lactating sows. No effects were observed in present experiment when gestating sows were fed with different particle sized corn.

• 한국작물학회지
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• 제39권4호
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• pp.397-404
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• 1994

경북 영천군 독농가가 재배한 정식 4년차인 의성종과 밀양종(P. lactiflora Pall.에 속하는 지방종)작약을 공시재료로 하여 생육시기별로 paeoniflorin 및 내용성분을 조사하고 수확기별로 약근수량을 조사한 결과를 요약해 보면 1. 개화기인 5월에 저장근 건물비율은 약 23%로 가장 낮았고, 수축율은 47%로 가장 높아 서로 상반된 양상을 나타내었으며, 6월 이후는 이들 특성의 변화가 없어 안정적이었다. 2. 전 생육기간 중 내용성분의 변화가 가장 큰 시기는 개화기인 5월이었으며, 약근에 함유된 paeoniflorin, 조단백, 조섬유 및 조회분은 공통적으로 개화기인 5월에 함량이 일시적으로 증가하였고, 총당 및 조지방은 변화가 적었다. 3. Paeoniflorin은 5월 시기에 6.37%로 가장 높았으며 6월 이후 변화없이 안정된 경향을 보였고, 의성종과 밀양종의 품종간 차이는 뚜렷하여 밀양종이 약 2% 높았다. 4. 전 생육기간 중 내용성분의 변화가 심하였던 전기(2∼5월)와 안정적인 후기(6∼10월)의 특성간 상관관계 중 전·후기 모두 정의 유의상관을 가진 것은 전분과 건물중, 조섬유와 paeoniflorin이며 부의 유의상관을 가진 특성은 전분과 조섬유, 전분과 paeoniflorin, 전분과 건물중 이었다. 5. 경장, 주당경수, 건전경비율은 이병으로 인한 고사로 8월보다 10월 수확기에서 현저히 낮았으며, 약근수와 길이도 근부현상이 심하여 10월 수확기에서 감소되었다. 6. 4년생 작약의 수확적기는 8∼9월이 적당하며 지상부 고사가 심하면 수확기를 앞당기는 것이 수량 및 품질면에서 더욱 안정적이다.

• Journal of Ecology and Environment
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• 제33권2호
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• pp.149-155
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• 2010

This study was conducted to investigate the feeding efficiency of the cattle egret (Bubulcus ibis) and the intermediate egret (Ardea intermedia) in relation to the stage of rice culture during two breeding seasons, 2006 and 2007, in Asan city, Chungcheongnam-do, South Korea. Cattle egrets caught mainly small invertebrate prey (insects and spiders, 98.4%) during all stages of rice cultivation, and had a higher prey capture rate in the plowing stage (14.98 prey/min) than in other stages (2.82-3.51 prey/min). Therefore, the biomass intake rate of cattle egrets was highest in the plowing stage. The intermediate egret captured both loaches (43.4%) and small invertebrates (50.6%). The prey capture rates of intermediate egrets increased gradually from the flooding stage (0.38 prey/min) to the planting stage (1.09 prey/min), and decreased in the growing stage (1.04 prey/min). However, intermediate egrets had the highest biomass intake rates in the plowing stage because more loaches were caught in the plowing stage (0.54 loaches/min) than other stages (0.23-0.36 loaches/min). Consequently, both intermediate egrets and cattle egrets had high energy intakes in the plowing stage and rice fields provided an important feeding habitat for both species.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1995년도 춘계 학술대회지
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• pp.106-107
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• 1995