• KOREAN JOURNAL OF CROP SCIENCE
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• v.33 no.3
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• pp.215-221
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• 1988

The hop yield prediction model developed based on meteorological elements in Hoeongseong was Y=6,042.846-17.665 $X_1$-0.919 $X_2$-96.538 $X_3$-138.105 $X_4$＋86.910 $X_{5}$ ＋ $X_{6}$ with MS $E_{p}$ of 25.258, $R_{p}$$^{2}$ of 0.9991, R $a_{p}$$^{2}$ of 0.9962 and $C_{p}$ of 7.00. The minimum air temperature at early growing stage ( $X_1$), the total precipitation at cone ripening stage ( $X_2$), the maximum air temperature at flower bud differentiation stage ( $X_3$) and the maximum air temperature at flowering stage ( $X_4$) influenced on hop yield as decrement weather elements. The average air temperature at early growing stage ( $X_{5}$ ) and the total sunshine hours at cone development stage ( $X_{6}$ ) influenced on hop yield as increment weather elements.lements.

• Korean Journal of Soil Science and Fertilizer
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• v.45 no.5
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• pp.683-689
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• 2012

This research was carried out to investigate the effect of installation spacing of subsurface drip irrigation pipe on the mineral content, nutrient uptake, yield of lettuce, water requirement for irrigation, and soil chemical properties in greenhouse cultivation. Semi-forcing and retarding culture were implemented in this experiment, with four treatments containing overhead spray irrigation and three subsurface irrigation lateral spacing intervals of 30, 40, 50 cm at a depth of 30 cm from soil surface, respectively. Each mineral content of lettuce grown under subirrigation system did not show significant difference between treatments, however the uptake of nutrients was lower at 50 cm-distance. The yield was largest in 30 cm-subirrigation (SI), followed by 40 cm-SI, overhead spray, and 50 cm-treatment. Water requirement for irrigation was highest in overhead spray, and it was in reverse proportion to the distance of irrigation pipes. $NO_3$-N content in the soil, at a depth of 10 cm, showed a higher value in 50 cm-SI, followed by 40 cm-SI, overhead spray and 30 cm-SI. Exchangeable K content was highest in 50 cm-SI, Mg was highest in 40 cm-SI, and Ca was lowest in 30 cm-SI. In conclusion, the lettuce yield was not different between 30 and 40 cm-SI, but water requirement for irrigation was lower as the distance of irrigation pipes was further. And it seems to be needed more precise research on this theme, because crop yield and the dynamics of soil minerals in subsurface irrigation can vary with the depth and distance of irrigation pipes, dripper, water flow depending on the soil texture, and plant response to soil minerals.

• Korean Journal of Plant Resources
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• v.19 no.4
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• pp.497-508
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• 2006

This study was conducted to obtain the basic information on rice cold damage and relationship to be connected with cold tolerance. The 20 rice varieties were screened to cold tolerance under low water temperature condition. The water gradient were controlled to $17^{\circ}C$ at the inlet and $21^{\circ}C$ at outlet of screening field. In the relationship between cold water irrigation and growth of rice varieties, effect on medium maturing cultivars were higher than early maturing cultivars. In relationship of shorting of culm length and panicle exsertion, culm length and panicle exsertion showed positive correlation. Yield of cultivars and culm length and percent of fertile grain showed positive correlation. However, heading date presented negative correlation. In the early maturing cultivars, except 'Kumobyeo', all cultivars range of discoloration value (1-3) was resistant. In the medium maturing cultivars, 'Donghaebyeo' was resistant in both the seedling stage whereas 'Hwajinbyeo' was resistant only in tiller stage. Cold water irrigation reduced spikelet number per panicle and percent of filled grain. Unhulled rice yield was increased according to water temperature gradient from inlet to outlet. There was varietal differences in head rice recovery by cold water treatment.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.104-108
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• 2006

논에서의 농업용수량의 산정은 많은 조사 및 연구를 통하여 정립되어 사용되고 있다. 그러나, 최근 논에서의 산정된 용수량과 실제 공급량을 비교해 보면 많은 차이를 보이고 있다. 실제 용수 공급특성 조사에 의하면 기존의 용수공급량 산정방법과 다른 몇 가지 특징을 가지고 있었다. 그중 주요한 차이점은 관개초기의 논물가두기 및 이앙기의 기간과 시기였으며 본답기간중의 중간낙수 실행여부였다. 본 연구에서는 실제 논에서의 용수공급특성에 대한 조사를 통하여, 용수공급량 산정 프로그램을 개발하고 이를 현장에 적용하는 것이다. 분석결과에 의하면 논에서의 농업용수량은 기존의 방법에 의해 산정한 값보다 약 20% 증가하는 것으로 나타났으며 본 연구에서 개발된 방법에 의해 산정된 농업용수량이 실제 용수공급패턴을 적절히 반영하는 것으로 분석되었다.

• Journal of Mushroom
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• v.19 no.1
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• pp.71-75
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• 2021

We analyzed the relationship between the main chemical properties (pH, total nitrogen content, total carbon content, and CN ratio) of sterilized medium and mushroom yields in 1 kg bag culture of Pleurotus ostreatus. The mushroom yields appeared to be highly correlated with the pH, total nitrogen content, and CN ratio, and were the highest under a total nitrogen content of 2.0-2.2% and a the CN ratio of 20-22.5. However, of the three parameters, total nitrogen content showed the highest correlation with the mushroom yield. The coefficient of determination(r2) between the total nitrogen content and the sum of the yield was 0.931, while that of the pH and CN ratio was relatively low. The nitrogen content of the medium was the most important factor in determining the yield of oyster mushrooms.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.1
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• pp.50-56
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• 2020

The field experiment was carried out to evaluate changes of dry matter productivity and feed value of Italian ryegrass and triticale at different growth stages in Wonju from 2018 to 2019. Italian ryegrass and triticale forages were harvested at an interval of seven days from May to June. The dry matter yield of Italian ryegrass with 7,870 kg/ha harvested on May 16 was significantly higher than that harvested on May 3 and May 9. The dry matter yield of triticale with 12,050 kg/ha harvested on June 7 was significantly higher than that harvested from May 3 to May 16. The crude protein yields harvested on May 16 were 890 kg/ha for Italian ryegrass and 1,103 kg/ha for triticale and were significantly higher than those harvested on May 3 and May 9. The total digestible nutrient yield(TDN) of Italian ryegrass with 5,223 kg/ha harvested on May 16 was significantly higher than that harvested on May 3 and May 9. The total digestible nutrient yield of triticale with 8,277 kg/ha harvested on June 7 was significantly higher than that harvested during May, but not different from that harvested after June 7. Considering the dry matter yield, crude protein yield and total digestible nutrient yield, it is suggested that the optimal harvesting times for Italian ryegrass and triticale seem to be May 16 and June 7, respectively.

• Korean Journal of Soil Science and Fertilizer
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• v.9 no.4
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• pp.251-256
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• 1976

Langmuir adsorption maximum was used as a basis for the estimation of phosphate requirement as related to the application method to a newly reclaimed hilly land. The application rates of phosphate fertilizer were 4 levels corresponding to 5, 10, 20, and 30 percent of the Langmuir adsorption maximum which was determined by the laboratory experiment. The phosphate fertilizer was applied in two different methods of broadcast and band application. Yield of soybean on a newly reclaimed hilly land was greatly affected by the amount of phosphate fertilizer and application method. With the same amount of phosphate fertilizer, the soybean yield in the broadcast was always lower than that in the band application even though the yield in the broadcast increased with the application rate up to the highest level of this experiment. However, the yield in the band application showed steep increase up to 20 percent level and then the yield decreased at the highest level. The yield at the rate of 5 percent with the band application was equal to the yield at the rate of 20 percent with broadcast, and the yield at the rate of 10 percent with band application was higher by 17 percent than that in the highest broadcast rate. When manure was applied at the rate of 1000 kg/10a to the plot of the 10 percent band application, the yield was 14.6 percent higher than the yield of the plot of the 10 percent band application without the manure and was equivalent to the yield of the plot of the 20 percent band application.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.324-328
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• 2009

수량과 수질 자료는 물에 대한 기본정보로 물 관리 분야뿐만 아니라 각종 SOC 사업의 계획 및 설계에 필수적인 자료로 활용되고 있다. 그러나 우리나라에서는 수량과 수질 관측의 주체가 분리되어 있고, 관측제도와 시설도 별도로 운영되고 있어, 결과 활용이 미흡할 뿐만 아니라 국가예산의 낭비가 발생한다. 이에 대한 정책적 개선방안으로 정책적 충돌을 해소하기 위한 임시 정책기구를 가동하여 정책방향을 결론짓고 이어서 관련 법령의 개정 및 국가수문관측종합계획 및 국가수문정보관리종합계획의 수립과 같은 방안을 통해 수문관리의 선진화가 필요함을 제시하였다. 기술적 개선방안으로 일부/통합 관측+ 통합관리안을 제안하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.04b
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• pp.320-322
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• 1993

제품의 수출시 운반경로는 대부분 해상을 이용하고있고 이때에는 콘테이너에 수출품을 적재하여선 적운반한다. 수송비는 콘테이너의 수량에 의해 좌우되며 콘테이너 내부에 들어가는 물건의 수량과 는 무관하다. 그러므로 콘테이너내부에 물건을 얼마만큼 효율적으로 싣는가에 의해 수송비가결정된다. 콘데이너 내부에 제품(BOX)을 어떤 방법으로 싣는가는 BOX의 크기나 종류에따라 항상 달라지게 된다. 본 논문에서는 BOX의 치수와 종류, 수량, 적재조건만 주어지면 그에따라 데이타의 계산과 가공이 되 어 적재되는 형상 및 적재수량 등이 계산되어 적재 형상이 도면으로 출력되는 적재시스템을 구축하였 으며, 본 논문에서 논하고자 하는 것은 시스템 구축시 NECK가 되었던 각 조건에대한 계산 알고리즘에 관한 것으로 이알고리즘은 현장작업자의 작업성을 고려한 최적의 적재가 되어야 했었다.

• Journal of the Korean Geotechnical Society
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• v.17 no.3
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• pp.51-58
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• 2001

본 연구에서는 종자와 비료, 부직포 지오텍스타일, 마 네트로 구성된 토목섬유 식생매트 시스템을 개발하였다. 개발된 식생매트를 흙 사면에 설치한 결과 사면의 식생성장과 사면안정에 긍정적인 효과를 얻었으며 이것은 실물시험을 통하여 강우와 사면에서의 유출수량, 부유물질, 토사침식량 등을 8개의 시험구에 식생매트를 분석하였다. 유출수량은 모든 시험구에서 강우량이 클수록 증가하였으며 식생매트를 설치한 곳이 안한 곳보다 유출수량이 작았으며 총부유물질은 유출수량에 크게 영향을 받는다. 식생매트는 흙 침식과 부유물질의 이동을 감소시켜 흙사면의 안정에 매우 유익하다. 또한 식생성장환경을 개선하며 특히 가뭄시에 성장에 매우 효과적이다.