• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 춘계학술대회 논문집
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• pp.209-217
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• 1994

The present study is concerned with the characteristics of the high speed precision bar cropping. This process is a practical application of High Energy Rate Forming in which the impact energy source is given by internal combustion engine. To enhance the added value of product, the recent forging fields trend toward the near net shape processes through the cold and closed die forging. For the purpose of these processes the precedent process is to obtain the precision billet which has little weight deviation and defect. The accuracy of initial billet by bar cropping depends upon the process parameters and die design technology. Therefore, in order to investigate the effect of process parameters upon product quality, the cropping experiments are carried out according to the various parameters such as billet clearence, billet length, billet material, cropping speed and so on. From these results some criteria of the optimal die design for the product of good quality are suggested.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.144-150
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• 2000

A field case study was performed to investigate optimum cropping technique of direct seeded rice. In addition, an economic analysis was made to see the effect of this method. Field study was performed at a 2.1㏊ paddy field in Kimjae city, Chonbuk province from 1991 to 1999. Various direct seeding method such as dryland seeding, wetland seeding, and no-till wetland seeding were introduced. Optimum cropping techniques such as when and how to manage the rotary till, water supply, herbicide application, and ponding depth were developed for different cropping methods. Based on this study ￦640,000 per ㏊ can be saved by direct seeding due to no nursery cost, and ￦l,220,000 per ㏊ can be saved by no-till and no nursery cost. With further study these cropping techniques including the no-till direct deeding proves to be advantageous these can be adopted for the most of the paddy fields in Korea.

• Current Research on Agriculture and Life Sciences
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• 제26권
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• pp.1-5
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• 2008

The purpose of this study is to describe some common upland cropping system in Youngnam and Honam region and to analyze it's income by the system. The main results are as follows; First, there are common cropping systems consisting of "sweet potato+barely", "corn+barely" and "bean+barely". Second, the highest earning system in Youngnam region is a "sweet potato+barely" (934,544won/10a) and that in Honam region is a "sweet potato+barely"(1,210,523won/10a) respectively. Third, in the differences of the cropping system's income level between Youngnam and Honam region, the former is higher than the latter in "corn+barely" and "bean+barely" respectively.

• 한국농공학회논문집
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• 제48권6호
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• pp.101-112
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• 2006

A Geographic Information System (GIS) was developed to estimate basin-wide soil losses using the Universal Soil Loss Equation (USLE). It was applied to estimate the annual average soil losses from the Saemangeum watershed. The USLE factors for each subarea of uniform land use and treatments were estimated from the GIS routines from digital topographic maps, land cover and detailed soil maps. A routine was developed to estimate the averaged cropping management factors (C) of USLE for multi-cropping farmlands, based on cropping system records from the district offices. The resulting C factors ranged from 0.28 to 0.35 for multi-cropping areas. The estimated annual average soil loss was approximately 2.9 million tonnes. Typical soil losses from different land uses were 0.8 t/ha at paddies, 33.7 t/ha at uplands and 1.1 t/ha from forested mountains. It was also found that 6.0% of the arable land of the watershed possessed high risks of soil losses, and conservation measures were needed to reduce soil losses.

• Journal of Applied Biological Chemistry
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• 제42권1호
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• pp.29-33
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• 1999

The present study examined annual runoff loading of nitrogen and phosphorus in the paddy field from 1 May, 1997 to 30 April, 1998. In the investigated area, the amount of rainfall was 1,095.6 mm and 414.6 mm during cropping season and non-cropping season. The annual rainfall was 1,510.2 mm. The total amount of runoff water was 1,043.2 mm and 281.0mm during cropping season and non-cropping season, and the added total amount of runoff water during two seasons was 1,324.2 mm. The runoff loading of nutrients caused by runoff water was measured as follows. The total-N was 149.23 and $8.67kg\;ha^{-1}$ (total amount=$157.90kg^{-1}ha^{-1}yr^{-1}$), the ammonia-N 102.98 and $4.44kg\;ha^{-1}$ ($107.42kg^{-1}ha^{-1}yr^{-1}$), the nitrate-N 28.45 and $1.23kg\;ha^{-1}$ ($29.68kg^{-1}ha^{-1}yr^{-1}$), the total-P 4.16 and $0.38kg\;ha^{-1}$ ($4.54kg^{-1}ha^{-1}yr^{-1}$) during cropping and non-cropping season respectively. When the loss ratio was calculated based on amounts of chemical fertilizer, about 68.6% of nitrogen and 16.7% of phosphorus was lost by runoff from applied fertilizer amount.

• 한국자원식물학회지
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• 제16권2호
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• pp.134-140
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• 2003

몇가지 전$.$ 후작물을 도입하여 들깨에 관한 작부체계 확립으로 안정생산 기반을 구축하고자, 들깨단작 등 6작부유형을 도입하여 2001년부터 2002년까지 2년에 걸쳐 시험한 결과 잡초발생은 보리+들깨, 흥화+들깨에서 많았다 보리+들깨와 홍화+들깨의 작부유형은 전$.$후작물의 생육에 지장이 없으며, 홍화+들깨는 전작물의 비닐 피복물을 후작물에서도 이용할 수 있어 생력화와 경영비를 절감할 수 있었으나, 참깨가 전작물로 도입 시에는 파종기가 늦어 생육이 부진하고 수량이 감소되었다. 소득은 들깨단작에 비하여 보리+들깨와 홍화+들깨에서 각각 4.1배, 5.2배 높았다. 작부유형별 토양 물리성 개선효과는 보리+들깨와 홍화+들깨에서 양호하였다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.333-333
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• 2017

This study was conducted to establish of cropping system for year-round forage crops production in east-southern part of Korea and investigated their productivity and feed values. Cropping systems were tested in experiment using oat (cv. Highspeed and Darkhorse) in spring and autumn season, corn (cv. Kwangpyeongok) and sorghum (ss-450) in summer season and rye (cv. Gogu) and triticale (cv. Joseong) in winter season. Considering the forage productivity and feed value such as acid detergent fiber (ADF), neutral detergent fiber (NDF) and total digestive nutrients (TDN), this result suggest that three cropping system for year-round forage crops production. The combinations with triticale (winter), corn or sorghum (summer) and oat (autumn) were would be suitable ones. And also the combinations with rye (winter), corn or sorghum (summer) and oat (autumn) were would be suitable. If forage crops cultivation was started in spring season, the combinations with oat (spring), oat (autumn), triticale or rye (winter), corn or sorghum (summer) and oat (autumn) were would be appropriable. For the more suitable cropping system, we are proceeding on verification experiment of year-round forage crops.

• 한국작물학회지
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• 제53권4호
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• pp.413-416
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• 2008

The cultivation of green manure crop is considered as a good management practice by increasing soil organic matter and fertility levels. This experiment was conducted to improve the soil environment under rice-based cropping system at paddy soil (fine loamy, mixed, nonacid, mesic, family of Aeric Fluventic Haplaquepts) in National Institute of Crop Science (NICS), Korea in 2006 to 2007. The variation of soil temperature in green manure plots was lower than without green manure (control) during spring season (April to May). The temperature variation of no tillage plot (broadcast before rice harvest) was the lowest among treatments. After green manure cropping, the soil bulk density and porosity ratio were improved at the top soil. The production of green manure was the highest athairy vetch and barley mixture plot by partial tillage. However, mixture treatment had no improvement on soil organic matter. After rice cropping with green manure application, soil quality was improved such as soil physical properties except mixture treatment. Therefore, we suggest that soil quality should be improved by green manure cultivation under rice-based cropping system.

• 한국작물학회지
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• 제59권1호
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• pp.73-82
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• 2014

본 연구에서는 간식용 풋옥수수로 이용되는 찰옥수수 주요 품종인 찰옥 4호와 일미찰을 2기작 재배하여 품질 좋은 찰옥수수 생산을 위한 재배법을 확립하고자 이삭과 종실 특성 변화를 조사하였다. 2기작 재배시 출사일수는 후기작이 전기작 보다 약 20일 정도 빨라졌고, 출사에서 수확적기까지는 약 10일 정도 느려졌다. 파종에서 출사까지의 적산온도는 약 $1,380{\sim}1,420^{\circ}C$, 출사에서 수확까지는 약 $590{\sim}630^{\circ}C$ 정도 범위였다. 이삭무게와 이삭직경은 출사 후 일수가 경과함에 따라 유의하게 증가하였으나 파종시기에 따른 차이는 없었고, 이삭길이와 착립길이는 후기작에서 유의하게 짧았다(p<0.05). 알곡 줄수는 파종시기에 따른 차이를 보이지 않았고, 줄당 립수는 찰옥 4호가 전기작보다 후기작에 재배한 것이 적었으며 변이폭이 컸다(p<0.05). 등숙 중 종실의 길이, 너비, 두께와 100립 생체중, 전분함량은 출사후 일수에 따라 유의하게 증가하였다(p<0.05). 후기작 재배시 저온 등숙으로 전기작 보다 100립 생체중과 전분함량의 증가속도가 느려졌다. 찰옥수수의 전분립은 과피와 가까운 배유의 상단부터 집적되기 시작하여 출사 후 일수가 경과함에 따라 배유 내부까지 집적되었으며, 후기작 재배한 찰옥수수는 전분립 축적속도가 느리고 조밀하지 않은 것이 관찰되었다. 100립 생체중은 springiness($0.80^{***}$), cohesiveness($0.44^{***}$), adhesiveness($-0.80^{***}$), chewiness($0.55^{***}$), 전분함량은 springiness($0.79^{***}$), adhesiveness($-0.81^{***}$), chewiness($0.49^{**}$)와 고도로 유의한 정의 상관을 나타내었다.

• 한국토양비료학회지
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• 제44권5호
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• pp.762-766
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• 2011

밭작물의 양분효율 증진을 도모코자 몇몇 지역의 대표작물을 중심으로 행해지는 작부유형을 조사하고 이의 작부유형별 양분수지를 분석하였다. 해남, 무안의 경우 마늘,양파 및 월동배추의 동작물과 콩, 참깨 등 시비량이 적은 하작물의 작부가 많았으며, 반면 평창은 배추를 년 간 2기작 재배 또는 봄 감자-가을배추 또는 무 재배가 전형적인 작부로 하작물 위주였다. 고추재배가 중심인 안동과 영양은 고추단작 그리고 고추-콩 또는 참깨가 주요 작부 유형이었으며, 중서부 해안지역인 홍성과 서산은 타 지역에 비해 비교적 작부유형이 다양한 편이였다. 작부유형별 양분수지는 배추를 1년 2기작 재배할 경우 질소 및 인산수지 모두 가장 높게 평가되어 환경적, 경제적 측면을 고려할 때 불리한 작부유형으로 나타났다.