• 한국농공학회:학술대회논문집
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• 한국농공학회 2002년도 학술발표회 발표논문집
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• pp.449-452
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• 2002

Characteristics of pollutant load during irrigation and non-irrigation periods was investigated for streamwater from a rural watershed. Water was sampled and discharge was measured at 5-days intervals at outlet of study area. The mean concentrations of TN and TP in an irrigation period are higher than in an non-irrigation period, while mean COD concentration in an irrigation period is lower than in a non-irrigation period. For increasing discharge during an irrigation period, TN concentration increase, TP concentration is nearly unchanged, and COD concentrations decreases.

• 생물환경조절학회지
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• 제8권1호
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• pp.1-8
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• 1999

This study was carried out to estimate the warmed water irrigation and the warmed soil efficiency on protected cultivation of cucumber in winter season. The water of 28$^{\circ}C$ was continuously supplied for soil warming and that is $25^{\circ}C$ for warmed water irrigation. Cucumber growth was analyzed when tile soil kept up the optimum temperature in the root zone. The cucumber growth are compared with the warmed soil plots. isolated warmed soil plots and non-warmed soil plots. The cucumber growth in warmed soil plots and isolated warmed soil plots were 20~50% higher than non-warmed soil plots compare to that by the warmed irrigation. In the non-warmed soil plots, the stem diameter and the number of leaves in the warmed water irrigation plots are 10% higher than those in the normal water irrigation plots. The yields in isolated warmed soil plots were 37~38% higher than non-warmed soil plots and those in warmed soil plots were 85~96% higher than non-warmed soil plots. The fruit length, weight and diameter in warmed soil plots were 15% higher than those in the non-warmed plots.

• 한국농공학회논문집
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• 제60권4호
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• pp.63-72
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• 2018

The main function of an agricultural reservoir is to supply irrigation water to paddy rice fields in South Korea. Therefore, the operation of a reservoir is significantly affected by the phenology of paddy rice. For example, the early stage of irrigation season, a lot of irrigation water is required for transplanting rice. Therefore, water storage in the reservoir before irrigation season can be a key factor for sustainable irrigation, and it becomes more important under climate change situation. In this study, we analyzed the climate change impacts on reservoir storage rate at the beginning of irrigation period and simulated the reservoir storage, runoff, and irrigation water requirement under RCP scenarios. Frequency analysis was conducted with simulation results to analyze water supply probabilities of reservoirs. Water supply probability was lower in RCP 8.5 scenario than in RCP 4.5 scenario because of low precipitation in the non-irrigation period. Study reservoirs are classified into 5 groups by water supply probability. Reservoirs in group 5 showed more than 85 percentage probabilities to be filled up from half-filled condition during the non-irrigation period, whereas group 1 showed less than 5 percentages. In conclusion, reservoir capacity to catchment area ratio mainly affected water supply probability. If the ratio was high, reservoirs tended to have a low possibility to supply enough irrigation water amount.

• 한국농공학회지
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• 제12권1호
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• pp.1861-1871
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• 1970

This experiment was carried out to compare soil moisture contents and the amounts of irrigation water by varying irrigating methods for chinese cabbages. The irrigating methods were non-irrigation (Plot A), furrow irrigation(Plot B). fixed nozzle pipe irrigation(Plot C), subsoil pipeline irrigation at the depths of 15cm. and 30cm., laying out in the middle of the rows of chinese cabbages(Plot D) and subsoil pipeline irrigation at the depths of 15cm, and 30cm., laying out beneath the rows of the roots of chinese cabbages(Plot E). In this experiment soil moisture contents were measured by using a simple electric device. As a result, the fallowing items are derived; 1) A significionce of 5% was observed between the yields produced at the furrow irrigation plot and fixed nozzle pipe irrigation plot, and those at the non-irrigation plot and subsoil pipe-line irrigation plot. 2) In the subsoil pipe-line irrgatiion, the Plot D type was observed to be slightly better than the Plot E type in the effect of the growth of cabbages. 3) The ratio of the amounts of irrigation water applied in the furrow irrigation plot, fixed nozzle pipe irrigation plot and subsoil pipe-line irrigation plot is approximately 3.2:2.1.

• Applied Biological Chemistry
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• 제43권4호
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• pp.285-290
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• 2000

본 연구는 논에서 강우에 의한 질소와 인산의 유출특성을 조사하였다. 이를 위하여 농업이외의 오염원이 비교적 적은 전라북도 진안군 마령면 평지리 일대 $5,000\;m^2$의 논을 시험포장으로 선정하여 1997년 5월 1일부터 1998년 4월 30일까지 12개월 동안 유출수 중 질소와 인의 시기별 함량변화 및 논에서의 유출수문 자료를 수집하였다. 논에서의 평균 유효유량은 관개기간 동안에 77.0 mm, 비관개기간 동안에는 21.2 mm로 나타났으며, 초기유출우량은 관개기간 동안 6.3-33.7 mm의 범위로 평균 12.9 mm, 비관개기간 동안 5.9-12.5 mm의 범위로 평균 9.2 mm로 산정되었다. 유출계수는 관개기간 중 0.59-1.36, 비관개기간 동안에는 0.57-0.86의 범위를 나타내었다. 관개기간과 비관개기간 사이에 영양물질의 유출특성에 차이가 없는지를 조사한 결과, 질소원과 인산원은 시기별로 유출량의 차이가 나타나지 않은 반면, 부유물질은 시기별로 차이를 나타내고 없었다. 논에서 강우-유출 중 발생하는 유출수량을 이용한 유출부하량 예측 결과, 질소원은 유출부하량 예측이 가능하였지만, 입자태 성분의 형태로 유출이 발생하는 부유물질과 전인은 약간의 오차가 발생하였다.

• Journal of Ginseng Research
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• 제32권4호
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• pp.279-282
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• 2008

생육기간동안 고랑에 관수하여 토양수분을 18-20%로 유지한 고랑관수구와 자연강우에 의존하여 토양수분을 공급한 대조구의 생육 차이, 수삼 수량, 수삼 및 홍삼 품질을 조사한 결과는 다음과 같다. 3년생 및 6년생의 생육을 조사한 결과, 고랑관수 처리구가 대조구에 비해 출아율, 전엽 및 상대생장율을 포함하는 모든 생육량이 증가하는 것으로 나타났다. 그리고 3년생의 10 a당근수량은 고랑관수구가 대조구에 비해 50% 정도 증수되었고, 6년생은 60% 이상 증수되었다. 6년생 수삼품질은 고랑관수구가 1, 2등급 비율이 30.0%로 대조구의 22.6%에 비해 증가되는 효과를 얻었다. 홍삼품질에 있어서 고급홍삼인 천지삼 비율은 고랑관수구가 43.0%로 대조구의 30.6%에 비해 현저히 증가되는 것으로 나타났고, 홍삼품질에 영향을 주는 백피, 내공, 내백이 감소하는 반면 균열은 증가하는 경향을 보였다. 이상의 결과를 통해 홍삼의 품질을 향상시키고 생산수량을 증가시키기 위해서 생육기간에 관수를 통해 토양수분을 적정 수준으로 유지시켜 주어 생육을 증대시키고 인삼잎에 수분을 충분히 공급하여 광합성을 원활하게 하여야 함을 알 수 있다. 적절한 토양수분의 관리는 수량 및 홍삼품질을 향상시킬 수 있을 것으로 판단되므로, 앞으로는 인삼재배지의 토양특성, 기후특성 및 지형 등의 조건에 부합하는 수분의 공급방법에 관한 연구가 필요하다.

• 농업과학연구
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• 제15권1호
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• pp.36-46
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• 1988

본(本) 실험(實驗)은 1/2,000a Wagner pot에 12개(個) 대두(大豆) 품종(品種)을 재배(栽培)하면서 관수(灌水)와 개화후(開花後) 30일간(日間)의 무관수처리(無灌水處理)에 따른 생육(生育) 및 수량(收量)을 품종별(品種別)로 비교(比較)하였으며 6개(個) 대두품종(大豆品種)을 1/2,000a Wagner pot에 재배(栽培)하여 개화기(開花期)에 대기습도(大氣濕度) 80, 70, 60, 50 및 40%에서의 광합성속도(光合成速度)의 품종간(品種間) 차이(差異)를 조사(調査)하였는데 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 모든 품종(品種)의 성숙일수(成熟日數)는 무관수처리(無灌水處理)에 의하여 단축(短縮)되었는데 그 정도(程度)는 품종(品種)에 따라서 상이(相異)하여 팔달(八達)콩, 단엽(短葉)콩 및 은대두(銀大豆)는 2일간(日間) 장백(長白)콩은 7일(日) 그리고 다마호마레는 8일간(日間)이나 단축(短縮)되었다. 2. 간장(桿長), 경직경(莖直徑), 주경절수(主莖節數), 분가수(分柯數) 및 분가절수(分柯節數)등은 모든 품종(品種)이 건조처리(乾燥處理)에 의하여 감소(減少)하였는데 특(特)히 분가수(分柯數)와 분가절수(分柯節數)는 무관수처리(無灌水處理)의 영향(影響)이 현저하였다. 3. 주당협수(株當莢數)와 완전협수(完全莢數)는 무관수처리(無灌水處理)에 의하여 현저히 감소(減少)하였는데 반(反)하여 불완전협수(不完全莢數)는 증가(增加)하는 경향(碩向)이었으며 관수처리(灌水處理)에 대(對)한 무관수처리(無灌水處理)의 주당협수(株當莢數)는 전체품종(全體品種) 평균(平均)이 58.0% 그리고 완전협수(完全莢數)는 46.6%이었다. 4. 주당입중(株當粒重)은 모든 품종(品種)이 무관수처리(無灌水處理)에 의하여 크게 감소(減少)하여 전체품종(全體品種) 평균(平均)이 관수처리(灌水處理)의 35.9%에 불과(不過)하였는데 팔달(八達)콩은 무관수처리(無灌水處理)의 영향(影響)이 가장 적었고 다마호마레와 장백(長白)콩은 무관수처리(無灌水處理)의 영향(影響)이 현저하였다. 5. 대기습도(大氣濕度)에 따른 광합성속도(光合成速度)는 습도(濕度) 및 품종간(品種間)에 차이(差異)가 나타났으며 품종별(品種別) 최고(最高) 광합성치(光合成値)에 대(對)한 대기습도(大氣濕度) 40%에서의 광합성속도(光合成速度)의 비율(比率)은 팔달(八達)콩이 97.2%, 단엽(短棄)콩이 96.4%이었고 백운(白雲)콩은 88.8%이었다. 6. 대기습도(大氣濕度) 40%에서의 광합성속도(光合成速度)와 증산(蒸散) 및 뿌리의 호흡속도간(呼吸速度間)에는 높은 정상관관계(正相關關係)가 인정(認定)되었다.

• 한국관개배수논문집
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• 제18권1호
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• pp.94-102
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• 2011

The aim of this study was to evaluate the load of non-point sources pollutant at a paddy plot located at the valley watershed during irrigation period. Irrigation, runoff and water quality data in the paddy plot were analyzed periodically from June 1 to October 31 in 2005. The observed amount of precipitation, irrigation, runoff for the experimental paddy plot during the irrigation period was 1,297.8, 223.2, and 825.4mm, respectively. Total-N concentrations ranged from 3.73 to 18.10mg/L, which was generally higher than the quality standard of agricultural water (1.0mg/L). Total-P concentrations ranged from 0.111 to 0.243mg/L and the average was 0.139mg/L. The observed runoff pollutants loadings from the paddy plot were measured as 34.4 kg/ha for T-N, 1.0 kg/ha for T-P and 213.8 kg/ha for SS. The non-point sources pollutant load in drainage water depends on rainfall and surface drainage water amount from the paddy plot. We are considering that these results were affected by rainfall as well as hydrological condition, soil management, whether or not fertilizer application, cropping, rice straw and plowing.

• 한국농공학회논문집
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• 제59권1호
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• pp.31-43
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• 2017

Recent studies about irrigation water use have focused on agricultural reservoir operation in irrigation period. At the same time, it is significant to store water resource in reservoir during non-irrigation period in order to secure sufficient water in early growing season. In this study, Representative Concentration Pathways (RCP) 4.5, 8.5 scenarios with the Global Climate Model (GCM) of The Second Generation Earth System Model (CanESM2) were downscaled with bias correlation method. Cumulative precipitation during non-irrigation season, October to March, was analyzed. Interaction between cumulative precipitation and carry-over storage was analyzed with linear regression model for ten study reservoirs. Using the regression model, reservoir drought response ability was evaluated with expression of excess and deficiency. The results showed that future droughts will be more severe than past droughts. Especially in case of non-exceedance probability of 10%, drought in southern region seemed to be serious. Nine study reservoirs showed deficiency range from 10% to 55%, which turned out to be vulnerable for future drought. Only Jang-Chan reservoir was secure for early growing season in spite of drought with deficiency of 8% and -2%. The results of this study represents current agricultural reservoirs have vulnerability for the upcoming drought.

• 한국관개배수논문집
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• 제12권1호
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• pp.69-77
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• 2005

In order to investigate effect of irrigation on soil moisture and garlic growth, a experimental plot, which was shielded from precipitation was established. The irrigation levels during the experimental period were 30, 20, 10 mm and non-irrigation with th