• 한국농공학회논문집
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• 제63권4호
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• pp.55-64
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• 2021

The expansion of upland crop cultivation in rice paddy fields is recommended by the Korean government to solve the problem of falling rice price and reduction of rice farmer's income due to oversupply of rice. However, water use efficiency is significantly influenced by the land use change from paddy field to upland. Therefore, this study aimed to evaluate the water budget of soybean grown in using APEX (Agricultural Policy and Environmental eXtender) model. The amount of runoff was measured in a test bed located in Iksan, Jeollabu-do and used to calibrate and validate the simulated runoff by APEX model. From 2019 to 2020, the water budget of soybean grown in uplands were estimated and compared with the one grown in paddy fields. The calibration result of AP EX model for runoff showed that R² (Coefficient of determination) and NSE (Nash-Sutcliffe efficiency) were 0.90 and 0.89, respectively. In addition, the validated results of R² and NSE were 0.81 and 0.62, respectively. The comparative study of each component in water budget showed that the amounts of evapotranspiration and percolation estimated by APEX model were 549.1 mm and 375.8mm, respectively. The direct runoff amount from upland was 390.1 mm, which was less than that from paddy fields. The average amount of irrigation water was 28.7 mm, which was very small compared to the one from paddy fields.

• 한국작물학회지
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• 제46권3호
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• pp.170-175
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• 2001

농가포장에서 발생하는 벼 이형주군별 발생포장 비율과 발생량 및 형질특성은 다음과 같다. 1. 우리나라의 지역별 발생포장 비율은 남서부, 남동부, 중부지방 순 이었고, 발생량은 남부지방이 중부지방보다 많았다. 2. 우점 이형주군은 단립적미군, 극만생 불임군, 장립적미군 순이었고, 장립적미군은 전남과 경남, 극만생 불임군은 전북, 단립적미군은 나머지 지역에서 우점하였다. 3. 대부분 이형주군의 간장은 인근 농가의 재배벼보다 길었는데, 특히 장립적미군과 단립적미군이 길었다. 4. 수당 영화수는 이형주군이 재배벼보다 많은 경향이었는데, 특히 극만생 불임군과 장립메성군이 많았다. 그러나 이형주군들은 대체로 불임이 심했다.

• The Plant Pathology Journal
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• 제37권2호
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• pp.200-203
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• 2021

Rice blast caused by the filamentous fungus Magnaporthe oryzae, is arguably the most devastating rice disease worldwide. Development of a high-throughput and reliable field blast resistance evaluation system is essential for resistant germplasm screening, resistance genes identification and resistant varieties breeding. However, the occurrence of rice blast in paddy field is easily affected by various factors, particularly lack of sufficient inoculum, which always leads to the non-uniform occurrence and reduced disease severity. Here, we described a procedure for adequately inducing the occurrence of rice seedling blast in paddy field, which involves pretreatment of diseased straw, initiation of seedling blast for the first batch of spreader population, inducing the occurrence of the second batch of spreader population and test materials. This procedure enables uniform and consistent infection, which facilitates efficient and accurate assessment of seedling blast resistance for diverse rice materials.

• 한국응용곤충학회지
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• 제43권4호
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• pp.291-296
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• 2004

충북지역에서 벼먹노린재(Scotinophara lurida)에 대한 월동처와 본논발생에 대하여 1999년부터 2001년에 걸쳐 조사하였다. 벼먹노린재 월동성충은 월동처에서 6월 상순부터 7월 상순까지 유아등에 포획되었으며, 이동최성기는 6월 하순이었다. 본논에서 각 태별 발생 피크는 월동성충이 7월 중순, 알이 7월 하순, 약충은 8월 중순에 가장 높은 밀도를 보였으며, 제 1대 성충은 9월 중순에 가장 높은 밀도 피크를 보였다. 월동태는 성충이며, 월동충은 산기슭, 제방, 논뚝에서 발견되었다.

• 한국응용곤충학회지
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• 제36권2호
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• pp.141-144
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• 1997

우리나라 남부지방에서 벼 기계이앙 및 직파재배에 따른 수도 주요해충의 발생피해를 조사한 결과, 끝동매미충, 혹명나방은 기계이앙답에서 다소 많은 발생을 보였으나 벼멸구, 애멸구는 직파재배답에서 더 많은 밸생을 보였다. 그리고 이화명나방, 흰등멸구, 벼줄기굴파리는 그 차이를 인정하기 어려웠다. 조사 해충 모두 기계이앙이나 직파재배보다는 재배시기가 발생 피해에 더 큰 영향을 주었다. 벼멸구, 흰등멸구, 애멸구, 끝동매미충은 재배시기가 늦을수록 발생량이 많았으나, 이화명나방과 혹명나방은 그 시기가 빠를수록 발생피해가 컸다.

• 한국응용곤충학회지
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• 제35권2호
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• pp.132-136
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• 1996

우리나라 남부지방에서 벼 이앙시기 및 시비수준과 주용해충 발생치해와의 관계를 조사한 결과, 조사해충은 모두 시비수준보다 이앙시기가 발생 피해에 더 큰 영향을 주었다. 특히 벼멸구 흰등멸구, 애멸구, 끝동매미충, 벼물기굴파리는 이앙시기가 늦을수록 발생량이 많았으나, 이화명나방, 혹명나방은 이앙시기가빠를수록 발생량도 많았고, 피해도 컸다. 그리고 끝동매미충과 이화명나방을 제외한 해충들은 이앙시기가 늦으면서 질소질비료가 많으며 발생량이 증가하는 경향이었다.

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

• 유기물자원화
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• 제10권2호
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• pp.59-64
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• 2002

국내에서 년간 발생하고 있는 가축분뇨는 약 34백만톤에 이르고 있다. 이렇게 다량 생산되고 있는 가축분뇨를 유기자원으로 논토양에 환원할 때 벼의 안전생산을 위한 돈분의 시용 한계시기를 구명하고자 건조돈분과 발효돈분을 이앙직전, 이앙 20일전, 이앙40일전에 처리하여 시험하였다. 그 결과 논토양에 돈분을 시용할 때에는 돈분 (돈분톱밥퇴비, 건조돈분) 모두 이앙직전에 시용이 기능하였다. 이 때 돈분에 함유되어 있는 고농도의 비료성분을 감안하여 화학비료의 절감 시용이 요구되었으며 시험결과 화학비료의 50% 절감이 가능하였다.

• Journal of Biosystems Engineering
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• 제27권2호
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• pp.133-142
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• 2002

This is a fundamental study to develop a sensor to detect weeds in paddy field using machine vision adopted spectralphotometric technique in order to use the sensor to spread herbicide selectively. A set of spectral reflectance data was collected from dry and wet soil and leaves of rice and 6 kinds of weed to select desirable wavelengths to classify soil, rice and weeds. Stepwise variable selection method of discriminant analysis was applied to the data set and wavelengths of 680 and 802 m were selected to distinguish plants (including rice and weeds) from dry and wet soil, respectively. And wavelengths of 580 and 680 nm were selected to classify rice and weeds by the same method. Validity of the wavelengths to distinguish the plants from soil was tested by cross-validation test with built discriminant function to prove that all of soil and plants were classified correctly without any failure. Validity of the wavelengths for classification of rice and weeds was tested by the same method and the test resulted that 98% of rice and 83% of weeds were classified correctly. Feasibility of CCD color camera to detect weeds in paddy field was tested with the spectral reflectance data by the same statistical method as above. Central wavelengths of RGB frame of color camera were tried as tile effective wavelengths to distingush plants from soil and weeds from plants. The trial resulted that 100% and 94% of plants in dry soil and wet soil, respectively, were classified correctly by the central wavelength or R frame only, and 95% of rice and 85% of weeds were classified correctly by the central wavelengths of RGB frames. As a result, it was concluded that CCD color camera has good potential to be used to detect weeds in paddy field.

• 한국농공학회지
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• 제23권2호
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• pp.35-44
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• 1981

This experiment was conducted to find out the consumptive use of irrigated water for calculation of duty water in paddy rice. Tall statured Japonica rice varieties, Nongbaek (early), Jinheung (medium) and Akibare (late), and short statured Tongil typed varieties, Josaeng Tongil(early), Suweon 264 (medium) and Suweon 258(late) were planted on the experimental farm of Kon-Kuk University in 1979. The results obtained in this study were as follows: 1. During the experimental period, the daily mean temperature was almost similar, the relative humidity was higher as much as 2.8%, the amount of rain fall was 100mm less and the pan evaporation was 70mm less compared with those of 30 years average, respectively. 2. The paddy soil was silty loam, which was suitable for the rice cultivation. 3. Varietal differences were find out for plant height, culm length, number of tillers, number of panicles, heading date, matured grain ratio, 1000-grain weight and rough rice yield. This difference might he the cause of varietal difference of the consumptive use of irrigated water during the rice growing period. 4. The evapotranspiration was gradually increased after transplanting and showed the peak from booting to heading stage of rice varieties. The average evapotranspiration through the whole growing period was 5.67-5. 80mm/day for tall statured Japonica varieties, and 5.99-6. 39mm/day for short statured Tongil typed varieties. 5. The ratio of evapotranspiration to pan-evaporation through the whole growing period was 1.49-1.50 for Japonica varieties, and 1.60-1.66 for Tongil typed varies. 6. Average amount of percolation in paddy field was 3. 62mm/day through the whole growing period of rice plant. 7. K-value in Blaney & Criddle formula was 0.94-0.98 for Japonica varieties and 1.02-1.08 for Tongil typed varieties, and coefficient consumptive water use (Kc-value) was 0.95-1.02 for Japonica varieties and 1.04-1.12 for Tongil typed varieties in this study. The modified coefficient for consumptive water use, which was calculated from data collected through the country including this study, was as follows;