• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 1996년도 분과위원회 연구과업 보고서
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• pp.401-448
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• 1996

• Journal of The Korean Society of Grassland and Forage Science
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• 제13권3호
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• pp.228-233
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• 1993

Method for the sun curing dehydration of pig excreta by using vinyl house was described. We determined effects of the dehydrated pig excreta on the yields of whole crop corn and proximate chemical composition of whole crop corn. Pig excreta were dehydrated upto 15% of moisture content by the 3-4 days of sun curing dehydration in vinyl house in the summer period. There was no significant difference between the dehydrated pig excreta treatment and the chemical fertilizer treatment on dry matter(DM) content, DM yield and crude protein contents of whole crop corn. Ca and Mg contents by the dehydrated pig excreta treatment were lower than those by thechemical fertilizer treatment. In the contrast, K content by the dehydrated pig excreta treatment was higher than those by the chemical fertilizer treatment. and dehydrated pig excreta treatments were higher in K/Ca+Mg ratio than chemical fertilizer treatment. These results suggested the availability of the sun curing dehydration of pig excreta in vinyl house in small-scale animal industry. In addition, the dehydrated pig excreta treatment showen similar effects to the chemical fertilizer treatment on dry matter yields and contents of chemical composition of whole crop corn. These results suggest that using the sun curing dehydration of pig excreta could reduce the chemical fertilizer cost. However, we need more study to the relationship between the unbalanced mineral contents and animal health.

• KOREAN JOURNAL OF CROP SCIENCE
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• 제22권1호
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• pp.20-25
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• 1977

In order to find out the effect of five kinds of cultural treatments in fall crop production of potatoes the experiments were carried out with Simabara cultivar at Chonan in 1976. Sprouting of dormant seed pieces were induced by soaking in 2ppm GA and 250ppm Ethrel mixed solution for 60 minutes. Seed pieces with longer sprouts at transplanting, and increasing of urea(nitrogen) application from 10 to 30 Kg per 10a resulted better growth, yields, and quality. Application of total nitrogen at one time on 24th July(transplanting date) resulted lower emergence, yields, growth, and quality as compared with divided application on 24th July and 15th August and 5th September. Higher transplanting than 60$\times$20cm or 70$\times$17cm resulted slender growth and lower yields. Deeper mulch with wheat straw (from 4 to 12cm) induced lower maximal earth temperature in summer and higher minimal earth temperature in autumn.

• Korean Journal of Soil Science and Fertilizer
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• 제22권1호
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• pp.67-71
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• 1989

The experiment was conducted to investigate the effects of the continuous cultivating periods of the hot-pepper, sesame and peanut on yields and soil microorganism from 1985 to 1988 in field. The results obtained were as follows: 1. Continuous cultivating decreased soil pH by 0.1 to 0.9 per year and soil hardness and bulk density increased. 2. Continuous cultivating increaded incidence of disease and number of nematodes. 3. The bacteria-fungi ratio of hot-pepper, sesame and peanut in continuous cultivation for 4 years were 29.6, 30.7 and 12.0 respectively. 4. The yields of hot-pepper, sesame and peanut in continuous cultivation for 4 years decreased by 39%, 33% and 23%, respectively, in comparion to 1 year cultivation.

• Korean Journal of Remote Sensing
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• 제35권1호
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• pp.57-81
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• 2019

Satellite images can be integrated into a crop model to strengthen the advantages of each technique for crop monitoring and to compensate for weaknesses of each other, which can be systematically applied for monitoring inaccessible croplands. The objective of this study was to outline the productivity of paddy rice based on simulation of the yield of all paddy fields in North Korea, using a grid crop model combined with optical satellite imagery. The grid GRAMI-rice model was used to simulate paddy rice yields for inaccessible North Korea based on the bidirectional reflectance distribution function-adjusted vegetation indices (VIs) and the solar insolation. VIs and solar insolation for the model simulation were obtained from the Geostationary Ocean Color Imager (GOCI) and the Meteorological Imager (MI) sensors of the Communication Ocean and Meteorological Satellite (COMS). Reanalysis data of air temperature were achieved from the Korea Local Analysis and Prediction System (KLAPS). Study results showed that the yields of paddy rice were reproduced with a statistically significant range of accuracy. The regional characteristics of crops for all of the sites in North Korea were successfully defined into four clusters through a spatial analysis using the K-means clustering approach. The current study has demonstrated the potential effectiveness of characterization of crop productivity based on incorporation of a crop model with satellite images, which is a proven consistent technique for monitoring of crop productivity in inaccessible regions.

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2011년도 추계학술발표회
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• pp.150-151
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• 2011

• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2011년도 추계학술발표회
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• pp.148-149
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• 2011

• Proceedings of the Korean Society of Crop Science Conference
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.305-305
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• 2017

Seoritae with green cotyledons refers to Korean native black beans harvested when the frost falls because the maturity is late. It is one of the beans preferred by consumers because of its softness and high sugar content. Because of late maturity, if the agricultural work is delayed by weather or agricultural schedule in green cotyledon black soybean (Seoritae), it affects seriously harvest and yield of soybeans. The aim of this study was to investigate the marginal seeding period on June 30, July 10 and July 20 in Cheongju and Jecheon area in Korea to produce stable soybean yield. The yields of green cotyledon black soybean as seeding date in Cheongju area are as follows: Seolitae (Yeoncheon), Seoltae (Goesan) and Seoritae (Gogseong), which increased by 23%, 56%, 23% and 40%, respectively, compare to July 10th to June 30th. As soybean sowing is delayed, the quality of soybean seeds has decreased due to the increase of immature seeds and fungal damaged seeds. The contents of anthocyanin in Cheongju area a functional substance of soybeans, was high on July 20 for Heukcheong, on June 30 for Seolitae (Yeoncheon), on July 10 for Seoritae (Goesan). The yields of Heukcheong and Seolitae (Yeoncheon) in Jecheon area were increased by 5% and 17%, respectively, compare to July 10th to June 30th, while Seolite (Goesan) and Seolite (Gogseong) were high in yields on June 30th. Similarly in Cheongju area, as the sowing period is delayed, the number of immature and mold damaged seeds in Jecheon area increased. The contents of anthocyanin in Jecheon area was high on July 10 for Heukcheong, on June 30 for Seolitae (Yeoncheon) and Seolitae (Goesan). From the above results, Sowing marginal date of green cotyledon black soybeans (Seolitae) in Cheongju area increased 30% in sowing on July 10 and increased 2% in sowing on July 20 compared to June 30. And Sowing marginal date of green cotyledon black soybeans (Seolitae) in Jecheon area increased 2% in July 10 compared to June 30, and the yield decreased rapidly on July 20. We have identified the seeding time limit of green cotyledon black bean in Chungbuk province. It will be possible to provide a variety of crop selection after double cropping of farmers. And by knowing the yield and seed quality of soybean according to sowing date, farmers will observe appropriate sowing period of soybeans for high quality. From the viewpoint of consumers, functional substances of Seoritae will meet the desire for health.

• Korean Journal of Agricultural Science
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• 제45권4호
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• pp.615-622
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• 2018

This study was done to determine the optimum sowing time for spring sowing wheat in the southern region of the entire Korean peninsula. Jokyoung and Keumkangmil were sown four times at one-week intervals starting from Feb. 14, 2013. The thousand grain weights of the two wheat varieties were the highest on February 14 with the seed weights ranging from 36.6 to 40 g and significantly decreasing as the seeding time was delayed. The unmatured grain percentage increased sharply when both cultivars were sown starting on March 7. The grain yields were the highest for Keumkangmil with 3.07 MT/ha when sowed on February 21 and 3.37 MT/ha for Jokyoung when sowed on February 14. In both cultivars, the grain yield decreased drastically when they were sown on March 7. Ash content did increase when the sowing date was delayed. The flour gluten index was the highest at 96.2 in Keumkangmil with a February 28 sowing, and the sodium dodecyl sulphate (SDS) segmentation was the lowest ranging from 63.8 to 65.3 mL with the February 28 sowing. The falling number tended to increase with the delay of the sowing period. The flour milling rate was gradually decreased with the delay of sowing, and the bran gradually decreased. When both cultivars were sown after February 28, the grain and flour yields sharply decreased. In the southern region, the optimum time for the spring sowing of wheat is from February 14 to February 21.

• KOREAN JOURNAL OF CROP SCIENCE
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• 제40권3호
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• pp.351-358
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• 1995

Since summer growth depression of forage crops limits hay production in Korea, it is important to exploit natural resources which are suitable as forage. In the preliminary experiment it was found that Panicum dichotomiflorum Michx. might be utilized as soiling and hay crop. Effects of seed stratificaion, planting date and number of harvestings on fresh and dry yields of Panicum dichotomiflorum Michx. were investigated in 1993 and 1994. Stratification of seed promoted emergence, while seed age decreased emergence. Although fresh yield was closely related with number of plants estabilished per unit area, effect of number of plants per unit area on yield was less at the later stage of growth. Higher cutting height decreased fresh and dry yield at th early stage, but final yields were not influenced by cutting height. Panicum dichotomiflorum Michx. could be harvested 3~4 times beginning 40~50 days after planting and fresh and dry yields were 9~10 tons /10a and 1.4~1.8 tons /10a, respectively. Fresh and dry yields were significantly influenced by growth duration or accumulated temperature between cuttings. Leaf blade ratio was higher at earlier planting and / or harvesting. Contens of crude protein, crude fat and crude ash were 16.32, 24.01 and 11.59%, respectively.