• Journal of agriculture & life science
• /
• v.50 no.4
• /
• pp.225-234
• /
• 2016

This study aimed at analyzing the economic value of 'Fuyu' sweet persimmon. For the analysis, the raw data of the latest 9 years were collected from 707 farmers in major sweet persimmon area and from 47 farmers surveyed in the field. These data include receipt price per kilogram, costs, yields per tree, etc. The findings are as follows: The break-even tree age of sweet persimmon was 85 years. The trees reach the maximum harvest at age of 65. 'Fuyu' sweet persimmon's economic value was 10,488 thousand won in income approach, 9,249 thousand won in cost approach, respectively.

• Journal of Mushroom
• /
• v.1 no.1
• /
• pp.48-53
• /
• 2003

This study was carried out to investigate effect of adding tobacco waste to promote oyster mushroom, Pleurotus ostreatus, mycelial growth and control of Trichoderma disease. Tobacco waste was treated on the surface of rice straw inoculated with oyster mushroom strains. The mycelial growth treated with 0.1g tobacco waste was somewhat faster than non-treatment. In the case of mixed media with 1.0g tobacco waste, mycelial growth was increased compare to control, but adding 2.0 g tobacco waste decreased the mycelial growth. We also treated the tobacco waste on Trichoderma disease. All of the tobacco waste treatment force down the growth of Trichoderma disease. We treated tobacco waste on the surface of rice straw substrates. ASI 2072 mycelial growth was decreased regardless of amount of tobacco waster and method of treatment. Mycelial growth of ASI 2180 was somewhat decreased with treatment of 0.1g and 0.2g In the case of media mixed, mycelial growth of ASI 2072 was decreased in the overall treatment. Mycelial growth of other strains were decreased as only 2.0g treatment. Field test of mycelial growth was conducted using rice straw and waste cotton with substrates. Rice straw culture with treated 3% tobacco waste and cotton waste culture with treated 6% tobacco waste showed the highest yield. There was no effect to Trichoderma disease.

• Korean Journal of Breeding Science
• /
• v.42 no.4
• /
• pp.374-380
• /
• 2010

In order to select excellent cross parents in strawberry breeding, 11 varieties were self-pollinated and tested their progenies. Among the 11 varieties, 'Akihime', 'Maehyang' and 'Seolhyang' showed superior in plant vigor, disease resistance and yield. Combining ability was tested using 15 progenies obtained from crosses between 3 selected varieties as seed parents and 5 varieties as pollen parents. Plant vigor was the strongest when 'Akihime' was used as a seed parent while ripening time tended to the fastest when 'Seolhyang' as a seed parent. Average fruit weight of the crosses 'Seolhyang' ${\times}$ 'Tochiotome', 'Seolhyang' ${\times}$ 'Geumhyang', 'Seolhyang' ${\times}$ 'Wongyo 3111' and 'Akihime' ${\times}$ 'Wongyo 3111' were above 18 g for marketable fruits. Fruit hardness was superior at crosses of 'Maehyang' as a seed parents to other crosses combinations, especially 'Maehyang' ${\times}$ 'Tochiotome'. Soluble solid contents (SSC) was not significantly different among cross combinations. The best cross combination for marketable yield was 'Akihime' ${\times}$ 'Wongyo 3111', followed by 'Seolhyang' ${\times}$ 'Geumhyang', 'Maehyang' ${\times}$ 'Geumhyang', 'Akihime' ${\times}$ 'Tochiotome', in order.

• Smart Media Journal
• /
• v.11 no.5
• /
• pp.9-16
• /
• 2022

Recently, agricultural sites are automating into digital agricultural smart farms by applying technologies such as big data and Internet of Things (IoT). These smart farms aim to increase production and improve crop quality by measuring the environment of crops, investigating and processing data. Production prediction is an important study in smart farm digital agriculture, which is a high-tech agriculture, and it is necessary to analyze environmental data using big data and further standardized research to manage the quality of growth information data. In this paper, environmental and production data collected from smart farm strawberry farms were analyzed and studied. Based on regression analysis, crop production prediction models were analyzed using Ridge Regression, LightGBM, and XGBoost. Among the three models, the optimal model was XGBoost, and R2 showed 82.5 percent explanatory power. As a result of the study, the correlation between the amount of positive fluid absorption and environmental data was confirmed, and significant results were obtained for the production prediction study. In the future, it is expected to contribute to the prevention of environmental pollution and reduction of sheep through the management of sheep by studying the amount of sheep absorption, such as information on the growing environment of crops and the ingredients of sheep.

• Journal of agriculture & life science
• /
• v.51 no.3
• /
• pp.19-27
• /
• 2017

This study was conducted to investigate the optimum transplanting method for increasing the rice yield and quality by early transplanting cultivation in Gyeongnam plain area. This examination used of the transplanting method of planting distance($30{\times}14$ and $30{\times}18cm$) with number of seedlings(3, 5 and 7 plants). In high planting density($30{\times}14cm$), the number of tillers was increased while plant height was decreased as the planting number increases. On the other hand, the plant height and number of tillers were increased as planting number increases in low planting density($30{\times}18cm$). However, the number of grain per panicle was increased while the number of panicle was decreased as the planting number decreases. The number of panicle and the number of grain per panicle was increased as the planting distance increase. The yield of rice, when transplanted in the distance of $30{\times}14cm$ with 3 plants, was higher than the other treatment. Head rice ratio and head rice yield was the highest when transplanted in the distance of $30{\times}18cm$ with 3 plants(403 kg/10 a). The protein content was decreased and Toyo taste value was improved when transplanted in the distance of $30{\times}18cm$. Taken together, the best transplanting method for early transplanting cultivation was low planting density($30{\times}18cm$) with 3 plants in Gyeongnam plain area.

• Journal of Mushroom
• /
• v.1 no.1
• /
• pp.9-14
• /
• 2003

To breed new superior strains, collected strains were characterized and then several white strains were selected as parents. Monokaryons from the parents were isolated and studied. All tested white strains showed same mating genotype. Growth rate of monokaryons were lower than collected dikaryons. New dikaryotic strains were derived from inbreeding method, which means mating between monokaryotic isolates from different white strains having same mating genotype. Some of them showed higher yields of fruitbody than their parents. Specially Fv 4-1 strain showed the best productivity. Furthermore some mating combination showed cytoplasmic effect, when they mated reciprocally.

• Journal of Mushroom
• /
• v.15 no.1
• /
• pp.57-60
• /
• 2017

In this study, we attempted to find alternative materials to rice bran (Japonica in Korea) such as rice bran pellet (Indica in Pakistan), corn distillers dried grains with solubles, sesame oil meal, and kapok meal for bottle cultivation of Pleurotus eryngii. Among all treatments, the total carbon content of the mixed substrate was the highest in T1 and the total nitrogen content was the highest in T4. The C/N ratio of T2 was comparable to that of the control and was higher than that of other treatments. The diameter of the pileus was the largest in T1 and T2, and the length of the stipe was the largest in T1 and T2. The yield and bio-efficiency of the fruit body were higher in T2 than in the other treatments, and were similar to that of the control plot. Therefore, the findings of our study suggest that rice bran pellet (Indica in Pakistan) could be a suitable alternative to rice bran (Japonica in Korea) for the cultivation of P. eryngii.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.35 no.8
• /
• pp.861-868
• /
• 2011

Flowmeters that measure the amount of fluid passing through conduits must kept accurate by comparison and the periodic calibration. The reference meters used are clamp-on meters that mount sensors on the outer wall of the pipe. They are called 1-path, 2-path or 4-path flowmeters depending on the number of sensors. We selected a flowmeter mainly used for K-water as test a flowmeter. We carried out experiments to find the intrinsic error of the flowmeter and errors in the downstream of a double bent pipe. The results show that there are the sensor locations that meet the tolerance. We suggested the angle of the sensor, the straight run from the downstream of the bent pipe and the number of sensors. So it is possible to improve the water treatment process and increase the accounted water rate by upgraded flow measurement technology.

• Journal of Mushroom
• /
• v.3 no.4
• /
• pp.129-132
• /
• 2005

A new functional mushroom cultivated variety "Jangsaeng" of Fomitella fraxinea was developed by crossing monokaryons derived from collected strains for contribution to mushroom farmers. The major characteristics of this mushroom were compared to Yeongji 2ho of Ganoderma lucidum because of their morphological similarities. The optimal temperature of mycelial growth and fruitbody sprouting and growth were 30 and 25~30, respectively. The surface color of fruitbody pilus was reddish brown and the fruitbody was flat kidney-shaped like Ganoderma lucidum except that the stipe was absent. Its texture was so tough and rigid that the yield per 1,000 ml bottle might be as high as 136 g. The hot water extract of this medicinal mushroom is fit to drink just like Ganoderma lucidum but its taste is not bitter.

• Annual Conference of KIPS
• /
• 2019.10a
• /
• pp.578-580
• /
• 2019

우리 나라의 딸기 수경재배 면적은 2002년 5ha로 시작해서, 2007년에는 84ha, 2012년에는 317ha, 2017년에 1,575ha로 매년 30% 이상 급속하게 성장하고 있다. 이런 경향은 수경재배가 토양재배보다 작업이 용이하여 노동시간이 절약되며, 수량을 더 많이 생산할 수 있기 때문이다. 하지만, 공급양액을 배액으로 흘려버리는 비순환식 수경재배 방식이 증가 하면서 환경오염을 유발시킬 뿐만 아니라 수경재배 운영비용의 증가를 가져오고 있다. 본 논문은 작물 생장에 최적화된 양액공급을 위해 상관관계 분석 및 다중 선형 회귀 모델 기반의 딸기 수경재배 환경에서의 최적 양액 흡수량을 분석하고 추정해 보았다. 분석 결과, 수경재배 환경정보(일사량, 온도, 습도, CO₂ 등)를 대상으로 일사량 및 온도가 습도 및 CO₂에 비해 딸기재배를 위한 양액 흡수량에 더 큰 영향을 주는 것으로 분석되었고, 다중 선형 회귀 모델을 통한 회귀식의 R-Square값은 0.358으로 나타났다.