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Research Article
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Development of an Approach for Predicting Spatio-Temporal Distribution of Soil Moisture and Providing Sufficient Irrigation Water in Orchard Areas
과수지역 토양수분 시공간 분포 예측 및 적정 관개수량 산정기술개발
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Seunghun Shin, Geunhyung Park, Heetae Kim, Minyoung Kim, Sangbong Lee, Yonghun Choi, Jonggun Kim
신승훈, 박근형, 김희태, 김민영, 이상봉, 최용훈, 김종건
- Moisture stress in the soil is one of the most important factors influencing plant growth. Soil moisture stress refers to a physiological …
- Moisture stress in the soil is one of the most important factors influencing plant growth. Soil moisture stress refers to a physiological response from excess moisture, such as the loss of more moisture than the moisture absorbed from the soil due to transpiration. Excessive soil moisture also causes considerable stress due to lack of air in the soil. To prevent moisture stress in the soil, it is important to estimate the appropriate amount of irrigation through spatial distribution prediction of soil moisture. At present, irrigation technology for field crop cultivation is being developed based on soil moisture and meteorological information (crop evapotranspiration). Therefore, in this study, we developed spatiotemporal distribution prediction technology by using soil moisture modeling techniques. We also developed a technique for estimating water stress and irrigation amount in open field crop areas by simulating soil moisture in the root zone. For the study area, an orchard located in Saam-ri, Chuncheon-si, Gangwon-do was selected. Soil moisture monitoring was performed according to the spatial distribution of soil moisture and soil depth. The soil moisture data was used as data for estimating and verifying the moisture simulation parameters of the APEX model and for comparing the predictions of root zone soil moisture at the monitoring site. As a result of this study, the spatial area vulnerable to drought within the study area was estimated, and the appropriate amount of irrigation was estimated accordingly. In line with the findings of this study, the spatial distribution of moisture can be predicted using a soil moisture simulation model. - COLLAPSE
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Development of an Approach for Predicting Spatio-Temporal Distribution of Soil Moisture and Providing Sufficient Irrigation Water in Orchard Areas
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Research Article
- Establishment of Real-time Polymerase Chain Reaction-based Molecular Markers to Distinguish between Rubus coreanus and Rubus occidentalis
- Yo Ram Uh, Cheol Seong Jang
- Rubus coreanus and Rubus occidentalis of the Rosaceae family are deciduous shrubs, which are commonly used in various health functional foods. The …
- Rubus coreanus and Rubus occidentalis of the Rosaceae family are deciduous shrubs, which are commonly used in various health functional foods. The scientific name and origin of R. coreanus and R. occidentalis are distinct. However, both plants are often confused due to the morphological similarity of their fruits and misuse of the common name of R. occidentalis, “Bokbunja,” in Korea. In the present study, molecular markers were developed using quantitative real-time polymerase chain reaction (PCR) to differentiate between the two species. Species-specific primers were designed using the internal transcribed spacer region of ribosomal DNA and chloroplast genes, including matK, atpA, rpoB, and rpoC2. When the six designed primer sets were verified, the slope ranged from -3.18 to -3.55 and the correlation coefficient exceeded 0.99. Accordingly, the efficiency ranged between 91.10% and 106.27%. Furthermore, the developed markers were verified using a specificity test on 14 other species, including the target species. The developed real-time PCR-based molecular markers are expected to prevent the misuse of R. coreanus and R. occidentalis, ultimately contributing to the protection of consumer rights in the medical herb market. - COLLAPSE
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Research Article
- Impact of Improved Variety Adoption on Rice Productivity and Farmers’ Income in Cameroon: Application of Propensity Score Matching and Endogenous Switching Regression
- Bobah Brillant Sisang, Jong In Lee
- The development and adoption of different agricultural technologies account for the global increase in food production, particularly in the rice sector. In …
- The development and adoption of different agricultural technologies account for the global increase in food production, particularly in the rice sector. In Cameroon, several improved rice varieties have been introduced in different production basins, significantly contributing to the steady increase in local production. The present study evaluated the impacts of adoption of certain improved varieties in the western highland agroecological zones of the North West and West Regions. Propensity score matching complemented by endogenous switching regression modeling was applied to ensure unbiased estimation. The results from both econometric approaches were consistent and indicated a positive and significant increase in both the productivity of rice and income of farmers adopting them. Overall, adopting improved varieties accounted for a 24.4% increase in rice productivity and 50.4% increase in farmers’ income. Notably, non-adopters are expected to witness significant increases in productivity and income should they decide to adopt improved varieties. Therefore, the government and development stakeholders are encouraged to consider expanding and promoting the adoption of improved rice varieties across key production zones to enhance productivity and boost farmers’ income. - COLLAPSE
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Research Article
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Ecological Characteristics of Hypomesus nipponensis Populations of Lake Soyang
소양호 빙어 개체군의 생태적 특성
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Doupyo Hong, Jaeyong Lee, Bumjun Kim, Jaeseok Choi
홍두표, 이재용, 김범준, 최재석
- To investigate the ecological characteristics that affect the growth of the Hypomesus nipponensis population in Lake Soyang, 615 H. nipponensis specimens were …
- To investigate the ecological characteristics that affect the growth of the Hypomesus nipponensis population in Lake Soyang, 615 H. nipponensis specimens were collected from the lake and examined 10 times between January and April 2019 and between January and March 2020. In 2019, the total length of Lake Soyang’s H. nipponensis was 73.3 ± 4.7 mm, and the weight was 1.9 ± 0.5 g. In 2020, the total length was 64.4 ± 12.3 mm, and the weight was 1.4 ± 1.3 g. The individuals collected in 2020 were smaller than those collected in 2019. During the survey period, the growth b values were highest in January and lowest in February, at 3.4 and 2.9, respectively. The obesity K value was negative in three out of four surveys conducted in February. The sex ratio of Lake Soyang’s H. nipponensis was 1 : 1.93, with males being more numerous, and the average number of females was 5457.9 ± 2152.9. As previous studies have shown, Bosmina longirostris, a tectonic species, accounted for 73% of H. nipponensis’ diet. The geographical distribution of H. nipponensis differed depending on its growth stage. The total length and weight of H. nipponensis collected in Bupyeong-ri, upstream of Lake Soyang, were 74.9 ± 10.9 mm and 2.4 ± 2.8 g, respectively. In contrast, specimens collected from Susanna-ri, located downstream, were much smaller, measuring only 48.1 ± 7.7 mm in length and 0.54 ± 0.3 g in weight. This study revealed that the distribution of H. nipponensis living in Lake Soyang, which has a long resin-type topography, varies depending on the growth stage. H. nipponensis is a cold-water fish species highly sensitive to water temperature changes. Its stocks are distributed throughout the country, including in Gangwon-do, and serve as effective environmental bioindicators. As such, these findings contribute to the understanding of H. nipponensis populations and water environments in distribution areas, particularly with regard to the impacts of climate change. - COLLAPSE
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Ecological Characteristics of Hypomesus nipponensis Populations of Lake Soyang
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Research Article
- Farmers’ Behaviour Towards Adoption of Climate-Smart Innovations and its Impacts on Farm Production in Buea, Southwest Region, Cameroon
- Kizito Sone Eboh, Hiojung Shin
- Climate change has effects that manifest via changes in temperature, rainfall pattern, and its predictability. These changes have deleterious effects on farmers …
- Climate change has effects that manifest via changes in temperature, rainfall pattern, and its predictability. These changes have deleterious effects on farmers via yield reduction. To this end, several approaches have been employed to overcome problems with climate change. Adoption of climate-smart agriculture (CSA) is one of the most resilient solutions. It is among the most promising solutions to climate change problems. This study evaluates the factors that influence farmers’ adoption of CSA and the consequent impact of adoption on farm production. The multinomial logit model and the Heckman two-step model were used to identify CSA adoption determinants and to evaluate CSA adoption effect on yield, respectively, using 150 farms. Access to extension service, cooperative membership, and land size per family member are the major drivers of CSA adoption. Land size and credit facility source are the major factors affecting farm crop yield. The inverse mills ratio while positive, was not statistically significant, but suggests that adoption of CSA by farmers did not influence farm output. - COLLAPSE
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Research Article
- Can Rice Replace Wheat? Evidence from Korean Consumers
- Hyun Ju Park , Sang Hyeon Lee
- This study aims to investigate the demand for wheat and rice processed food in South Korea to assess the feasibility of the …
- This study aims to investigate the demand for wheat and rice processed food in South Korea to assess the feasibility of the Korean government's ‘Measures to vitalize the rice processing industry’ policy. This policy was proposed in response to the decline in rice consumption and the country's high dependency on imported wheat. However, the empirical research on consumer demand for rice processed food and its ability to replace wheat is limited. This study aims to address two main questions: the extent to which consumers consider wheat and rice processed food as substitutes, and the potential impact on rice consumption if the rice processing industry expands. The study used household account book data from 2010-2021 and a survey of 1,550 households to estimate the demand system, using the Source Differentiated Almost Ideal Demand System (SDAIDS) method. The results suggested that despite the substitutability of rice and wheat processed foods, rice-processed foods may also substitute for white rice consumption. Therefore, the expected increase in total rice consumption via rice processing may be overestimated. - COLLAPSE
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Research Article
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Comparison of Growth of Hydroponics Methods Using Botton-matt without Bench on Grafted Cactus (Gymnocalycium mihanovichii var. friedrichii) Cultivar of ‘Gohong’
접목선인장 ‘고홍’의 저면매트를 이용한 수경재배의 생육 특성 비교
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Jung-Soo Lee
이정수
- This study aimed to evaluate growth differences between soil and nutrient solution cultivation methods using grafted cacti. The grafted cactus, Gymnocalycium mihanovichii …
- This study aimed to evaluate growth differences between soil and nutrient solution cultivation methods using grafted cacti. The grafted cactus, Gymnocalycium mihanovichii var. friedrichii cultivar ‘Gohong’, was grown in soil and hydroponically, and its growth characteristics were compared. The hydroponic method included an ebb and flow system and a bottom mat without bench. The results displayed that the hydroponic cultivation of ‘Gohong’ resulted in improved growth compared to soil cultivation. The hydroponic method produced the highest fresh weight. However, there were also concerns about root rot in soil cultivation, as well as traces of hydroponic cultivation on the rootstock in the ebb and flow system. Overall, the hydroponic method, using a bottom mat without bench, was found to be the best growth method for this cultivar. In the future, the increased use of this method is recommended to improve productivity on farms. - COLLAPSE
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Comparison of Growth of Hydroponics Methods Using Botton-matt without Bench on Grafted Cactus (Gymnocalycium mihanovichii var. friedrichii) Cultivar of ‘Gohong’
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Research Article
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Characteristics of Seasonal and Temporal Variation of Zooplankton Community by Turbid Water in Lake Doam
도암호 탁수 영향에 따른 동물플랑크톤의 시･공간적인 변동 특성
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Jaeyong Lee, Changwon Jang, Jaeseok Choi, Younggeel Kim, Woomyung Heo, Eunkyoung Park , Jaelyoung Cheon, Yoonhee Kim
이재용, 장창원, 최재석, 김영길, 허우명, 박은경, 천재룡, 김윤희
- In this study, we conducted 12 seasonal surveys between 2016 and 2018 to understand spatial and temporal fluctuations of the zooplankton community …
- In this study, we conducted 12 seasonal surveys between 2016 and 2018 to understand spatial and temporal fluctuations of the zooplankton community structure in Lake Doam when exposed to the effects of surface discharge. The total number of species identified was 29 in 2016, 34 in 2017, and 25 in 2018. The total abundances were 1,942.3 ind/L (70.9 ind/L－374.1 ind/L) in 2016, 2,852.6 ind/L (47.2 ind/L–906.5 ind/L) in 2017, and 985.5 ind/L (10.4 ind/L–312.5 ind/L) in 2018. The fluctuations in community structure during the study period were related to the inflow of turbid water due to monsoon rainfall, which formed a thick layer of turbid water. This layer first formed in Lake Doam during the summer in 2016 and 2017 and persisted into the following year. Consequently, the community structure of zooplankton changed toward smaller species. Rotifera was the dominant phylum, with the most common zooplanktons (33 species; 68.8%), followed by Copepoda (8; 16.7%), Cladocera (4; 8.3%), and Protozoa (3; 6.3%). A clear water phase, with a weak turbid layer and stable thermal stratification, was only observed in June 2017, which resulted in the dominance of Daphnia galeata. Therefore, the structural changes in zooplankton communities in Lake Doam seem to be related to hydraulic and hydrological factors such as rainfall patterns and the duration of a turbid water layer. The change in the zooplankton community structure would be a useful indicator for reflecting turbidity duration and discharge characteristics in lake ecosystems. The emergence of macrozooplankton may also be a good indicator for determining the water quality characteristics of lake ecosystems. - COLLAPSE
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Characteristics of Seasonal and Temporal Variation of Zooplankton Community by Turbid Water in Lake Doam
Journal Informaiton
Journal of Agricultural, Life and Environmental Sciences
Journal of Agricultural, Life and Environmental Sciences
Agriculture and Life Sciences Research Institute, Kangwon National University
강원대학교 농업생명과학대학 농업생명과학연구원
1 Kangwondaehak-gil, Chuncheon, Gangwon 24341, Korea
Tel: +82-33-250-6408 / Fax: +82-33-259-5743 / E-mail: alsri@kangwon.ac.kr Copyright© Agriculture and Life Sciences Research Institute, Kangwon National University
Tel: +82-33-250-6408 / Fax: +82-33-259-5743 / E-mail: alsri@kangwon.ac.kr Copyright© Agriculture and Life Sciences Research Institute, Kangwon National University