• 농촌계획
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• 제26권2호
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• pp.51-59
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• 2020

In this study, we analyzed the characteristics of 511 agricultural districts through statistical data, and classify these districts as the vulnerable area to drought through correlation and cluster analysis. The criteria for classification was related to ground-water recharge, irrigation water demand, and water supply. As a result, 8 types of agricultural districts were extracted. For example, the type 1 indicated the high priority area for ground-water development, thus the districts which were classified as type 1 showed ground-water use was less than 80 % of maximum capacity, and irrigation water supply was only 37.5 % and 76.5 % of irrigation water demand in upland and paddy field, respectively. As a result, 44 of 511 districts were classified as type 1.36 districts (types 5-8) were areas where groundwater development is limited. The results of this study are expected to provide useful information for establishing the direction of the rural area development project in connection with the revitalization of policy of people return to rural area.

• 한국토양비료학회지
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• 제43권3호
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• pp.289-295
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• 2010

경남지역 논 토양의 중금속 관리를 위한 기초 자료를 제공하고자 260 지점을 대상으로 1999년부터 2007년까지 4년 주기로 분석하였다. 논 토양의 중금속 평균 함량은 Cd 0.426 (범위 0.003-1.379) mg $kg^{-1}$, Cr 1.189 (0.003-3.264) mg $kg^{-1}$, Cu 9.68 (0.05-22.38) mg $kg^{-1}$, Ni 2.64 (0.01-7.36) mg $kg^{-1}$, Pb 23.7 (0.7-54.1) mg $kg^{-1}$, Zn 20.8 (0.7-131.2) mg $kg^{-1}$, As 1.054 (0.001-2.110) mg $kg^{-1}$ 였다. 장기적인 변동조사 결과 경남지역 논 토양의 Cd, Ni 및 Zn 함량은 유의적으로 증가한 반면, Cr, Cu 및 As 함량은 유의적으로 감소하였고 Pb 함량은 큰 변화가 없었다. 논 토양 As 함량은 Cu 및 Pb와 고도로 유의적인 정의상관을 보인 반면, Cr 및 Ni 함량과는 유의적인 부의상관을 나타냈다. 경남지역 논 토양 중금속의 주성분 분석결과 고유값이 1.0 이상인 주성분은 3개였고 제 1주성분 (PC1)에 속하는 토양 중금속은 Cd (0.550), Ni (0.490), Zn (0.452) 및 Pb (0.422) 등 4개였으며 제 2주성분 (PC2)에 속하는 토양 중금속은 As (0.760) 및 Cr (-0.375)등 2개였고 제 3주성분 (PC3)에 속하는 토양 중금속은 Cu (0.740) 였다. 논 토양 중금속 함량의 특성은 제 1주성분이 34.3%, 제 2주성분이 17.5%로서 전체 51.8%의 자료를 설명할 수 있는 것으로 나타났다.

• 한국토양비료학회지
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• 제43권2호
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• pp.140-146
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• 2010

효율적인 논 토양의 양분관리를 위한 기초 자료를 제공하고자 경남지역 논 토양 260 지점의 화학성분 변동을 1999년부터 2007년까지 4년 주기로 분석하였다. 논 토양의 화학성분 평균 함량은 pH 5.7 (범위 4.4-7.6), 유기물 29 g $kg^{-1}$ (1-86), 유효인산 202 mg $kg^{-1}$ (2-1,218), 치환성 칼륨 0.32 $cmol_c\;kg^{-1}$ (0.04-1.80), 치환성 칼슘 5.4 $cmol_c\;kg^{-1}$ (0.4-33.1), 치환성 마그네슘 1.2 $cmol_c\;kg^{-1}$ (0.2-6.0) 및 유효규산 103 mg $kg^{-1}$ (21-742) 였다. 연도별 토양 화학성분 변동 특성을 요약하면 유효인산 함량은 1999년부터 이미 적정범위 보다 높았고 유효규산 함량은 아직까지도 많이 부족한 상태였으며 치환성 양이온은 칼슘과 마그네슘에 비해 칼륨이 상대적으로 높은 편이었다. 연도별 주성분 분석결과 Eigenvalue가 1.0 이상인 주성분은 2개였고 제1주성분 (PC 1)에 속하는 토양 화학성은 치환성 칼슘 (0.511), 치환성 마그네슘 (0.478), pH (0.402), 유효규산 (0.395) 및 치환성 칼륨 (0.392) 등 5개였으며 제2주성분 (PC 2)에 속하는 토양 화학성분은 유효인산 (0.664) 및 유기물 함량 (0.551) 등 2개였다. 토양 특성은 제 1주성분이 39.1%, 제 2주성분이 20.4%로서 전체 59.5%의 자료를 설명할 수 있는 것으로 나타났다. 논 토양의 화학성분을 주기적으로 모니터링 한 결과는 다양한 농업환경 변동을 이해하고 대응함으로서 지속적인 농업을 발전시키는 데 기여할 것으로 판단되며 이러한 관점에서 주성분 분석은 아주 유용하게 사용할 수 있을 것으로 기대된다.

• Journal of Biosystems Engineering
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• 제28권1호
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• pp.1-10
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• 2003

A computer simulation was carried out to determinate the optimum capacity of bulk type trailer which is used as a tractor attachment. Soil physical properties. such as soil moisture content. bulk density, soil hardness and soil texture were measured in the 10 major rice production area for computer simulation. Mathematical model which include soil physical properties and vehicle factor was used for computer simulation. Most of the soil texture of the investigated area was silty loam. Soil moisture content ranged between 30 and 40% mostly. Soil bulk density was in the range of 1.500 to 1.700 kg/㎥. Soil hardness ranged between 1 to 18 kg/$\textrm{cm}^2$. Soil hardness incorporate the effects of many soil physical properties such as moisture content texture and bulk density, and so the range of soil hardness was greater than any other physical properties. The capacity of bulk type trailer was above 3000 kg$_{f}$ fer the most of the investigated area. and mostly in the range of 4000 to 6000 kg$_{f}$ depending upon the slip. But for the soft soil area such as Andong and Namyang. tractor itself had mobility problem and showed minus trailer capacity for some places. For this area. the capacity of bulk type trailer ranged between 1000 and 2000 kg$_{f}$ mostly so bulk type trailer should be designed as a small capacity compared to the other area.ared to the other area. area.

• 한국육종학회지
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• 제50권4호
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• pp.516-521
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• 2018

신품종 '누리찰'은 찰성 쌀보리 신품종으로 국립식량과학원에서 계통육종법으로 육성하였다. 3개 지역에서 답리작 지역적응시험을 실시한 결과 답리작 적응성이 높으며, 쓰러짐에 강하고 수량이 7-16% 증가된 보리밥 특성이 좋은 계통임이 입증되었다. 출수기와 성숙기는 답리작에서 새찰쌀보리보다 각각 1일 늦었다. 간장은 82 cm로 중장간, 수장 4.0 cm, $m^2$당 수수는 774개로 새찰쌀보리와 많았으며 천립중은 25.0 g으로 새찰쌀보리보다 가벼웠고 도복에 강하고 보리호위축병에 저항성을 보였다. 단백질 함량은 새찰쌀보리보다 적었고, ${\beta}-glucan$, 전분, 아밀로스 함량은 새찰쌀보리와 비슷하였다. 흡수율은 비슷하였고 퍼짐성은 다소 높았다. 호화특성은 최고점도가 높고 치반점도가 낮았으며, 보리밥 물성은 경도, 탄력성, 저작성이 새찰쌀보리보다 낮아 보리밥이 다소 부드러운 특성을 보였다. 평균수량성은 답리작에서 4.00 MT/ha로 새찰쌀보리보다 10% 증가하였다.

• 한국토양비료학회지
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• 제17권3호
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• pp.207-211
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• 1984

1976년(年)부터 1979년(年)까지 군증산왕(郡增産王) 이상(以上)의 쌀 다수확(多收穫) 수상(受賞) 농가포장(農家圃場)을 무작위(無作爲)로 102개소(個所) 선정(選定)하여 비배관리(肥培管理)와 토양특성(土壤特性)을 조사(調査) 분석(分析)하고 수량(收量)과의 상관(相關)을 구(求)하였다. 다수확답(多收穫畓)에서는 토양개량제(土壤改良劑)의 시용량(施用量)이 일반답(一般畓)보다 많았고 고위수량답(高位收量畓)일 수록 간단관수(間斷灌水), 심경(深耕) 등(等) 요인별(要因別) 토양개량(土壤改良) 실시비율(實施比率)이 높아졌다. 다수확답(多收穫畓)은 토양유형(土壤類型), 적성등급(適性等級), 배수등급별(排水等級別) 구분(區分)에 따라 수량(收量)의 차이(差異)가 거의 없었다. 다수확답(多收穫畓)의 토성(土性)은 70% 이상(以上)이 양토(壤土) 내지 미사질양토(微砂質壤土)였으나 식토(埴土) 또는 사토(砂土)에도 분포(分布)되어 있었다. 작토층(作土層)의 이화학적(理化學的) 특성(特性)은 일반답(一般畓)보다 훨씬 양호(良好)한 수준(水準)이었고, 토양(土壤)의 이화학적(理化學的) 요인(要因)과 수량(收量)과의 상관(相關)을 보면 토양유형(土壤類型)에서 수량(收量)과 작토심(作土深) 및 보비능(保肥能) 간(間)에는 정(正)의 상관(相關)이 있었지만 다른 성분(成分)들은 토양유형별(土壤類型別)로 경향(傾向)이 다르게 나타났다.

• 한국물환경학회지
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• 제25권2호
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• pp.193-204
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• 2009

The study was conducted investigation on land of D-dong in N city which is an urban area and D myeon of N city which is a suburban area, based on high resolution satellite image, to find out actual land usage. As for D-dong in N city, different rate between actual usage and official land information was 0.5~4.8% in terms of 5 major land types (paddy field, farm, ground, forest, and others). D myeon in N city posted 1.4~8.4%, which is higher than that of its counterpart. As for unit load, "land" which is large in terms of load presented a big difference between official information and actual usage. On the other hand, the levels of paddy, field, forest and others posted only small changes in load. In case of T-P, in particular, unit of each land type is lower than BOD and T-N, showing almost no changes in pollution loads.

• 농약과학회지
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• 제5권4호
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• pp.68-71
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• 2001

고리형 이미드계 화합물 중에서 제초활성이 매우 좋은 것으로 알려진 S-275의 bicyclic 4,5,6,7-tetrahydro-indazole 부분의 염소 대신에 다른 여러 가지 작용기가 치환된 5종의 유도체들을 여러 경로를 통하여 합성하였고, 이들의 제초활성을 논조건에서 시험하였다. 대부분의 화합물의 제초활성은 매우 약하였으나, methylthio기가 치환된 유도체는 매우 강한 제초효과와 함께 벼에 대한 안전성은 S-275에 비해서 매우 개선된 결과를 보였다.

• 한국농공학회지
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• 제43권2호
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• pp.59-68
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• 2001

A water balance analysis was performed for a paddy field neighboring the Dongchang stream, downstream of the Unmun reservoir, which is constructed for the urban water supply. Daily rainfall data were collected and irrigation water flow rate, drainage flow rate, evaportranspiration, infiltration, and piezometeric head were measured in the field. The flow rates were continuously observed by water level logger during the growing season. The evaportranspiration and the infiltration were measured by N-type depletion meter and cylindrical infiltrometer, respectively. PVC pipes with 12mm diameter were used for piezometric head measurement. Total Irrigation and drainage flows were 3,608mm and 1,170mm in 1999, and 3,971mm and 1,548mm in 2000, respectively. The mean and range of the daily infiltration rate were 4.4mm/d and 3.4mm/d to 5.5mm/d in 1999 and 5.1mm/d and 4.1mm/d to 6.5mm/d in 2000, respectively. The net ground water flow including the change of soil water storage was 2,855mm in 1999 and 2,540mm in 2000. The evapotranspiration was 458.3mm in 1999 and 553.5mm in 2000. The range of daily evapotranspiration rate was from 1.6 to 8.7mm/d. The return flow ratio was about 32% in 1999 and 39% in 2000 and three year average was 35% including previous study in 1997. The amount of irrigation water was much higher than design standards or references in this study, This was caused by the inadequate water management practice in the area where water was oversupplied on farmers’ request rather than following sound water management principles.

• Asian-Australasian Journal of Animal Sciences
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• 제15권2호
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• pp.195-204
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• 2002

The objective of this study was to examine the impact of three categories of supplements on intake and diet induced difference on degradation of straw substrates. Sixteen crossbred cattle fitted with rumen cannula were randomly divided into 4 equal groups. Animals were fed on wheat straw ad libitum without any supplement except mineral mixture (control; $T_1$) or supplemented with concentrate mixture (CS; $T_2$) or green Lucerne (GLS; $T_3$) or urea-molasses block lick (ULS; $T_4$). Total dry matter intake in $T_2$, $T_3$ and $T_4$ was increased by 70, 54 and 49%, respectively compared to $T_1$ which was only 1.55 kg/100 kg B.Wt. Other than control animals, straw intake was less on $T_3$ than $T_2$ or $T_4$. In Sacco degradation of untreated and urea treated wheat or paddy straw in different treatments indicated that the supplements had a significant (p<0.01) impact on rapidly soluble (A) and insoluble but potentially degradable (B) fractions of straw. Urea treatment increased fraction-A but, provision of supplement improved fraction-B also. Effective degradation (ED) of OM was better on $T_2$. Rate of degradation (C) of OM and CWC was dependent on diet and type of straw but hemicellulose and cellulose were related to latter factor only. ED of cell wall carbohydrates (CWC) was similar in $T_2$ and $T_4$ but higher than $T_3$. CS was more effective in improving the degradation of both untreated and urea treated straw while ULS was effective on the former only. CS had more impact on superior quality straw while contrary was true with ULS. Although GLS improved intake and degradability of untreated and urea treated straws, its bulkiness affected the straw intake compared to other supplements.