• Journal of Korean Society of Forest Science
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• v.106 no.4
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• pp.473-479
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• 2017

This study is to analyze differences in gross income between only forestry and agroforestry. In addition, cost structure and management performance on poultry farming was surveyed. The study sites were three forestry households located in Chungju, Kyungsan and Hwacheon. The method of its management performance were conducted by interview. And, survey items of the performance were operating expenses items and gross income items in 2015. As a result of study, gross income of Chungju business model was 25,608,000 won. The operating cost was 20,217,571 won so that the net income was 5,390,429 won. In case of Gyeongsan, gross income was 33,950,000 won and the operating cost was 18,655,714 won. Thus, the net income was 15,494,286 won. Hwacheon business model showed that gross income was 31,850,000 won, the operating cost was 13,143,000 won. Thus, the net income was 18,707,000 won. And, break-even point of sale volume, which meets cost, was 617 chicken in Chungju, 125 chicken in Gyeongsan, and 63 chicken in Hwacheon. In terms of selling cost-per-production ratio, Chungju business model was 79%, Kyungsan was 55% and Hwacheon was 41%. The results of this study indicates that margin ratio per chicken was 21% in Chungju, 45% in Kyungsan and 59% in Hwacheon. On Agroforestry, increasing rate for gross income was evaluated by 16% in Chungju, 18% in Gyeongsan and 11% Hwacheon.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.35 no.2
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• pp.117-121
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• 1990

A sweet corn hybrid, Golden Cross Bantam 70, was grown at 5 plant populations (5,000, 6,000, 7,000, 8,000, and 9,000 plants/10a) under the transparent P .E. film mulch to find the best yield evaluation method. Plant population did not affect early plant growth, culm length, ear height, and silking date. However, number of tillers at harvest decreased but leaf area index increased with increased plant population. Marketable ears were divided into two classes; the first grade of which husked ear weight over l50g (unhusked ear weight 230g) and the second grade of which husked ear weight between 100 and 150g (unhusked ear weight between 180 and 230g) according to the whole sale market price. Average length, thickness, and weight of marketable ears over 100g of husked ears decreased with increased plant population. The proportion of ears over 150g decreased with increased plant population. However, total number and weight of marketable ears and gross income per 10a calculated considering weight and number of ears increased with plant population. There were highly positive correlations between gross income and ear number or ear weight per unit area. At high plant populations the number of marketable ears was overestimated but ear weight underestimated compared with gross income. Dry matter yield of stover increased with increased plant population and ranged 755-944kg/10a with 20.7-24.5% dry matter content. Rice black-streaked dwarf virus infection rate was 10.6-14.9%, but it was not related to plant population.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.35 no.1
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• pp.83-89
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• 1990

A sweet corn hybrid, Golden Cross Bantam 70, was grown at 0, 5, 10, 15 and 20kg/10a of nitrogen (N) under the transparent P. E. film mulch to find the best yield evaluation method. Culm length, ear height, number of tillers increased and silking date was earlier by 1-2 days with increased N level. Leaf area index of main culm at harvest increased with increased N level. Marketable ears were divided into two classes according to the whole sale market price; the frist grade of which husked ear weight over 150g (unhusked ear weight 230g) and the second grade of which husked ear weight between 100 and 150g (unhusked ear weight between 180 and 230g). Average length, thickness, and weight of both grades of marketable ears were not different among the N levels. The proportion of the first grade increased with increased N level. However, total number and weight of marketable ears and gross income per 10a calculated considering weight and number of ears increased with increased N level. There were highly positive correlations between gross income and ear number or ear weight per l0a. The number and weight of marketable ears were underestimated at high N levels compared with gross income. Dry matter yield of stover ranged 740-963kg/10a and increased with increased N level with 20. 8-24.5% dry matter content. Rice black-streaked dwarf virus infection rate was 11.8-15.0%, but it was not related to N level. N concentration in ear was similar but that in stover increased with increased N level. Total N uptake increased but N recovery decreased with increased N level.

• Proceedings of the Korean Society of Crop Science Conference
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• 1990.05a
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• pp.102-103
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• 1990

• Proceedings of the Korean Society of Crop Science Conference
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• 1990.05a
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• pp.104-105
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• 1990

• Journal of Korean Society of Forest Science
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• v.98 no.4
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• pp.504-511
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• 2009

This study to understand the production cost of cultivation in chestnut tree (Castanea spp.) as a result of a survey conducted of 227 farmers is as follows. In full-time farmer, average cultivation area was 5.5 hectares and average chestnut production was 1.6 tons per hectare. In chestnut sale type, more than 73% of total production was sold by Nong-hyup (7an agricultural cooperative association) and intermediaries, and also proportion of nut size grade was 18% in special-large nut, following 49% in large nut, 25% in middle nut and 8% in small nut. There was considerable difference among cultivated regions in gross income, whereas total average gross income was 2,103 thousand KRW per hectare and 66.4% of it was used in management expenses. Finally the chestnut cultivated farmers have a yearly income of 706 thousands KRW (net income rate 33.6%). As peculiarity of regional production cost, a low tree farm in height and a labor intensive growing helped the improved quality of the chestnut so, on average, 2,161 thousand KRW per hectare of the income of the Chungnam was raised. However caused by an old-age of chestnut trees, there was a little input to management expenses and it resulted in low productivity in the Jeonnam and the Gyeongnam.

• Journal of Bio-Environment Control
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• v.25 no.2
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• pp.95-99
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• 2016

As the survey results of cultivation area, farmhouse, yield and income to clarify the effect of PO Film on Korean melon industry in Seongju region, the covering areas of PE film of Korea, Kyungsangbuk-do and Seongju-gun in 2014 were decreased 91.5%, 94.9% and 95.2% as to 2010. In contrary, the covering areas of PO film of Korea, Kyungsangbuk-do and Seongju-gun in 2014 were increased 342.5%, 500% and 825% as to 2010. The cultivation area and farmhouse in 2015 were decreased 8.8% and 11.9% than those in 2010. The yield and production in 2015 were 38.2% and 25.9% increased han those in 2010. The gross and net income in 2015 were 1.3 and 2.7 times increased than those in 2010. Finally, to change as PO film, the productivity will be increased. And cleaning work and noxious materials discharge will be decreased.

• Current Research on Agriculture and Life Sciences
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• v.32 no.3
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• pp.165-169
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• 2014

This study assessed the economic feasibility of an automatic egg washer. Based on various cost benefit analysis methods, including the net present value (NPV), internal rate of return (IRR) and benefit cost ratio (B/C Ratio), the automatic egg washer was confirmed to have economic feasibility. The NPVs were 38,565,991 won at 5% discount rate and 32,013,916 won at 10% discount rate, respectively. The IRRs were 1.325 at 5% discount rate and 1.299 at 10% discount rate, respectively. Finally, the B/C ratios were 1.726 at 5% discount rate and 1.699 at 10% discount rate.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.207-208
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• 2000

담수산 rotifer, Brachionus calyciflorus는 입의 크기가 작은 담수어 종묘생산시 자어의 초 먹이생물로 많이 이용되고 있다. 이들의 성장은 male의 출현 없이 폭발적으로 개체가 증가되는 처녀생식과 male의 출현으로 휴면란(내구란)을 생산할 수 있는 유성생식으로 나눌 수 있다. 특히, 유성생식에 의해 생성된 내구란은 종의 효율적인 보존 뿐만 아니라 Artemia cyst처럼 간단하게 부화시켜 자어에게 먹이로 공급할 수 있는 장점이 있다. (중략)

• Journal of Bio-Environment Control
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• v.30 no.4
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• pp.342-350
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• 2021

This study was conducted to investigate the effect of time of hand-thinning on vegetative growth, bitter pit incidence, fruit quality, and return bloom in 'Gamhong'/M.9 apple trees. The time of hand-thinning were 3, 5, 7 and 9 weeks after full bloom, and the primary thinning (leaving only the king fruit on cluster) and secondary thinning (adjusting crop load) were conducted at the same time. The time of hand-thinning was correlated to the vegetative growth, average fruit wight, yield, soluble solids content, bitter pit incidence, and return bloom, negatively, and to the yield of middle grade fruits (fruit weight was 250-299g and none pit on fruit surface) per tree, calcium contents of leaves, and fruit red color, positively. There was no significant effect of time of hand-thinning on fruit firmness, titratable acidity, and total incomes per tree. In conclusion, if the time of hand-thinning of 'Gamhong'/M.9 apple tree was completed at 9 weeks after full bloom, it could produce about 300g of high-quality fruit without bitter pit.