APEX 모형을 이용한 밭작물(콩, 배추) 물발자국 영향 평가

허승오,최순군,홍성창 한국환경농학회 2019 한국환경농학회지 Vol.38 No.3

BACKGROUND: The water footprint (WF) is an indicator of freshwater use that appears not only at direct water use of a consumer or producer, but also at the indirect water use. As an indicator of ‘water use’, the water footprint includes the green, blue, and grey WF, and differs from the classical measure of ‘water withdrawal’ because of green and grey WF. This study was conducted to assess and estimate the water footprint of the soybean and Chinese cabbage. METHODS AND RESULTS: APEX model with weather data, soil and water quality data from NAS (National Institute of Agricultural Sciences), and farming data from RDA (Rural Development Administration) was operated for analyzing the WF of the crops. As the result of comparing the yield estimated from APEX with the yield extracted from statistic data of each county, the coefficients of determination were 0.83 for soybean and 0.97 for Chinese cabbage and p-value was statistically significant. The WFs of the soybean and Chinese cabbage at production procedure were 1,985 L/Kg and 58 L/Kg, respectively. This difference may have originated from the cultivation duration. The WF ratios of soybean were 91.1% for green WF and 8.9% for grey WF, but the WF ratios of Chinese cabbage were 41.5% for green WF and 58.5% for grey WF. CONCLUSION: These results mean that the efficiency of water use for soybean is better than that for Chinese cabbage. The results could also be useful as an information to assess environmental impact of water use and agricultural farming on soybean and Chinese cabbage.

Application of smartphone and wi-fi communication for remote monitoring and control of protected crop production environment

허승오,한경화,전상호,장용선,강신우,정선옥,김학진,이경환,Hur, Seung-Oh,Han, Kyeong-Hwa,Jeon, Sang-Ho,Jang, Yong-Sun,Kang, Sin-Woo,Chung, Sun-Ok,Kim, Hak-Jin,Lee, Kyeong-Hwan Institute of Agricultural Science 2011 Korean Journal of Agricultural Science Vol.38 No.4

Protected crop production has been popular in Korea as well as in other countries. Intensive and continuous monitoring and control of the environment, which is labor- and time-consuming, is critical for stable crop productivity and profitability, otherwise damage could be happened due to unfavorable ambient and soil conditions. In the study, potential utilization of smartphone and remote access application in protected crop production environment was investigated. Tested available remote access applications provided functions of mouse click (left and right buttons), zooming in and out, and screen size and color resolution control. Wi-Fi data communication speeds were affected by signal intensity and user place. Data speeds at high (> -55 dBm), medium (-70~-56 dBm), and low (< -71 dBm) signal intensity levels were statistically different (${\alpha}=0.05$). Means of data communication speed were 6.642, 4.923, and 2.906 Mbps at hot spot, home, and office, respectively, and the differences were significant at a 0.05 level. Smart phone and remote access application were applied successfully to remote monitoring (inside temperature and humidity, and outside precipitation, temperature, and humidity) and control (window and light on/off) of green house environment. Response times for monitoring and control were less than 1 s at all places for high signal intensity (> -55 dBm), but they were increased to 1 ~ 10 s at home and office and to 10 ~ 30 s at hot spot for low signal intensity (< -71 dBm) for Wi-Fi. Results of the study would provide useful information for farmers to apply these techniques for their crop production.

벼에 대한 지역별 물 생산성 및 잠재 물 소비량 평가

허승오,최순군,엽소진,홍성창,최동호 한국농촌계획학회 2019 농촌계획 Vol.25 No.4

Agricultural water for crops are faced with the need to improve the use efficiency due to the impact of climate change. Water productivity (WP) is known as a good indicator for assessing resources efficiency. This study was conducted to assess WP of rice and potential water consumption (PWC) as new indicator for water use efficiency assessment. The average of WP was 0.7 kg/㎥, and Jeonbuk had the highest WP as 0.83 kg/㎥. Kangwon and Kyungbuk had the lowest WP as 0.59 kg/㎥. PWC showed the same trend because of rice consumption per capita, but Total PWC considering population living in each province showed the different trend with PWC. Every year, the changing patterns of WP was increasing little by little, and the patterns of PWC was decreasing greatly than WP. These results mean that WP has been slowly improved through breed development and irrigation techniques, and PWC was affected by reduced rice consumption and WP increasing. PWC could also be useful as an indicator to compare the water use efficiency between provinces or nations.

피복재질에 따른 벼 보온못자리 내의 미기상 특성

허승오,황규홍 한국작물학회 2001 한국작물학회 학술발표대회 논문집 Vol.2001 No.2

답전윤환 인삼재배 예정지 토양의 물 이동특성 평가

허승오,이윤정,연병열,전상호,하상건,김정규 한국약용작물학회 2009 한국약용작물학회지 Vol.17 No.3

This study was conducted to assess water movement in paddy-upland rotation soil scheduled for ginseng cultivation through the measurement of infiltration and permeability of soil water. Soil sample was divided with four soil layers. The first soil layer (to 30cm from top soil) was loamy sand, the second and the third soil layers (30~70 ㎝) were sand, and the fourth (〈 120 ㎝) was sandy loam. The soil below 130 ㎝ of fourth soil layer was submerged under water. The shear strength, which represents the resisting power of soil against external force, was 3.1 kPa in the first soil layer. This corresponded to 1/8 of those of another soil layer and this value could result in soil erosion by small amount of rainfall. The rates of infiltration and permeability depending on soil layers were 39.86 cm hr-1 in top soil, 2.34 cm hr-1 in 30~70 ㎝ soil layer, 5.23 cm hr-1 and 0.18 cm hr-1 in 70~120 ㎝ soil layer, with drain tile, and without drain tile, respectively. We consider that ground water pooled in paddy soil and artificial formation of soil layer could interrupt water canal within soil and affect negatively on water movement. Therefore, we suggest that to drain at 5 m intervals be preferable when it makes soil dressing or soil accumulation to cultivate ginseng in paddy-upland rotation soil to reduce failure risk of ginseng cultivation.

생산함수를 이용한 농업용수 관개량과 벼 생산성간 관계 평가

허승오,최순군,엽소진,홍성창,최동호 한국환경농학회 2019 한국환경농학회지 Vol.38 No.3

BACKGROUND: Production function gives the equation that shows the relationship between the quantities of productive factors used and the amount of product obtained, and can answer a variety of questions. This study was carried out to evaluate the relationship between irrigation water used for rice production and rice productivity by the production function which shows the mathematical relation between input and output. METHODS AND RESULTS: The statistical data on rice production and on the amount of irrigation water were used for the production function analysis. The analysis period was separated for 1966-1981 and 1982-2011, based on goal’s change on agriculture from 'increasing food' to 'complex farming'. The relation between irrigation and yield considering production function is a short-term production function both before and after 1982. These results can be expressed by the sigmoid relation. When comparing the graphs of the two analyzed periods, there are differences in quantity between the maximum point and the minimum point during the same analysis period, which can be called an ‘Irrigation Effect’ by the difference of irrigation, and ‘Technical Effect’ by the difference by inputs like as fertilizers etc. CONCLUSION: The results could be useful as information for assessing the relationship between agricultural water and the productivity of rice and predicting rice productivity by irrigation water in Korea.

물-에너지-식량-탄소 넥서스 기반의 탄소중립 연구방안

허승오 한국농식품정책학회 2022 한국농식품정책학회 학술대회 논문집 Vol.2022 No.8

Variation Characteristics on Soil Physical Properties of Paddy Fields in Korea

허승오,손정우,옥정훈,황선아 한국토양비료학회 2023 한국토양비료학회지 Vol.56 No.4

The monitoring of soil physical properties of paddy fields is to be conducted in accordance with the notification (No. 2017-12) of the Rural Development Administration of Korea. The monitoring began in 2007 and was also monitored in 2011, 2012, 2015, and 2019. This study was conducted to evaluate the trends of these monitoring results by year. The main soil series of the paddy soils monitored were centered on soils such as Jisan-series, which had a large area distribution, and the topography was mainly distributed in valley/alluvial fan and flat areas like as river alluvium. In addition, most of the soil texture consisted of sandy loam, loam, and silt loam. The bulk density of the paddy subsoil and plowing depth have been showing an increasing trend until 2019 from 2007. The plowing depth is less than 20 cm, which is the standard for determining appropriate soil depth, but in 2019, it was 19.3 cm, approaching the appropriate standard. The distribution ratio of bulk density of subsoil exceeding the standards notified by the Rural Development Administration had been exceeding 80% since 2012. Soil organic matter content in paddy fields tended to increase in both topsoil and subsoil. The hardness of subsoil exceeded 20 mm which is the appropriate standard for paddy soil, except in 2019. As a result, it is believed that the plowing depth is increased by the introduction of large agricultural machinery, etc., making it possible to plow the soil deeper. However, the introduction of large agricultural machinery deteriorates the bulk density and hardness of the soil, so it is necessary to spread soil improvement methods such as subsoil crushing. It was also assessed that soil improvement, such as lowering the bulk density by increasing the organic matter content through continuous input of organic matter into the soil, was necessary.

제18차 세계토양학회 Working Group 발표내용

허승오,정강호,박찬원,하상건 한국토양비료학회 2006 토양과비료 Vol.27 No.-

상해 위험지의 깊이에 따른 지온의 변화

허승오,황규홍,심교문,이정택 한국작물학회 2000 한국작물학회 학술발표대회 논문집 Vol.2000 No.2