• 한국농공학회논문집
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• 제66권2호
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• pp.13-24
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• 2024

This study aims to contribute to efficient paddy field water management by developing an IoT-based automatic paddy inlet that can consider water level changes according to variations in the supplied water quantity through irrigation channels. This IoT-based automatic paddy inlet not only ensures water level changes based on the supply of irrigation water but also secures irrigation efficiency. The effectiveness and efficiency of the developed IoT-based automatic paddy inlet were presented to contribute to efficient paddy field water management. As a result, the IoT-based automatic paddy inlet demonstrated the capability to maintain the optimal water level in the paddy field. Particularly, it exhibited up to 18.4% higher water resource usage efficiency compared to conventional paddy inlet, emphasizing the IoT-based automatic paddy inlet's advantage in terms of water resource usage.

• 한국농공학회논문집
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• 제48권2호
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• pp.69-76
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• 2006

Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. The increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, two fallow paddy fields managed with different water depth were selected for monitoring and analysing of water quality, water balance and plant body change. The managed fallow paddy fields were more effective in water quality purification and plants growth control than non-managed fallow paddy fields. And the fallow paddy field managed with some degree of water depth was the most effective field in terms of weed control.

• 한국토양비료학회지
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• 제46권6호
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• pp.417-425
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• 2013

This study investigated the runoff from rice paddy located on reclaimed fine sandy loam soil to provide data for the development of policies to protect water quality of estuaries. Total N (TN), Total P (TP) concentrations and runoff loads at outlet were monitored from 2006 to 2008. Soil phosphate adsorptivity was measured and compared with typical paddy soil in watersheds. TP concentration of the paddy water and TP runoff loads were much greater than those of typical paddy field in watershed because phosphate adsoptivity in reclaimed paddy field of fine sandy loam appeared to be a third of those of typical paddy soils by relatively low soil OM and high sand content of the reclaimed soil. Thus, nutrient runoff, particularly phosphate from the reclaimed paddy field needs to be managed more thoroughly to protect estuarine water quality.

• 생태와환경
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• 제38권1호통권110호
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• pp.118-127
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• 2005

관개방법이 논에서의 수문 및 수질특성에 미치는 영향을 파악하기 위하여 관개용수가 풍부한 지표수 관개지역과 관개용수가 부족한 지하수관개지역에서의 물수지 및 영양물질수지 분석을 실시하였다. 지표수 관개논은 영농 기간동안 지속적으로 관개가 이루어졌으나, 지하수 관개논은 영농초기에만 이루어졌으며, 그 이후에는 강우에 의해 담수심이 유지되어 지표유출은 지표수 관개논에 비해 상대적으로 낮은 빈도를 나타내었다. 지표수의 영양물질 농도는 시비에 의해 크게 영향을 받는 것으로 나타났으며, 특히 다량의 시비가 이루어지는 영농초기 (5 ${\sim}$ 6월 중순)에는 높은 영양물질 농도를 나타내어 이 시기에 논에서 유출이 이루어진다면 하류 수계에 영향을 줄 것으로 판단되었다. 물수지 분석결과 지하수 관개논의 관개량, 지표유출량 등이 상대적으로 지표수 관개논에 비해 낮은 값을 나타내었다. 영양물질수지분석 결과 대부분의 유입은 시비에 의해 이루어졌으며, 유출은 지표유출이 많은 비중을 차지하였으나 지표유출과 침투유출사이의 비율은 토양의 특성에 좌우되는 것으로 판단된다. 외부에서의 유입을 제외하고 시스템내에서의 유출입만 고려한다면, 물관리가 효율적으로 이루어진 지하수 관개논에서 낮은 부하량을 나타내었다. 그러나 기비가 이루어지고 인위적인 낙수나 강우에 의한 유출이 발생할 경우, 높은 부하량 뿐만 아니라 고농도의 영양물질질이 수계로 유입되는 것으로 나타났다. 논에서의 비점오염관리를 대안으로 현재 시행되고 있는 시비량 감소 뿐 아니라, 효율적인 물관리기법 개발이 포함되어야 할 것으로 판단된다. 특히 영농초기의 강우특성과 논에서의 담수기능을 고려해 볼 때 시비에 의한 높은 영양물질 농도를 나타내는 논 표면수의 유출을 효율적으로 억제할 수 있을 것으로 판단된다. 물꼬높이의 증가와 천수간단관개 영농초기의 강우에 의한 유출을 억제시킴으로써 부족한 관개용수의 절약 뿐만 아니라 하류수계의 수질보호에 기여를 할 것으로 판단되며, 다양한 조건에 따른 환경적인 측면 뿐 아니라 벼의 생리적인 측면은 장기적인 모니터링을 통해 반드시 고려되어야 할 것이다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.14-21
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• 1998

In 1996, a cold-water damage occured in the paddy field at downstream of the Unmoon dam. To study the cause and the preventive measures of the cold-water damage a field study was performed during the growing season of 1997. Field measurements such as water temperatures at reservoir, irrigation canal and in the paddy field were made. As a result, there was no cold-water damage due to the right irrigation water management practice in 1997. The cold-water damage is passible to happen, however, and the preventive measures were provided.

• 한국물환경학회지
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• 제20권6호
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• pp.597-602
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• 2004

Field experimental study was performed to examine characteristics of nutrient export from paddy rice fields with irrigation practices. Experimental fields with surface-water and ground-water irrigation were monitored and analyzed during rice culture period. The water balance showed that outflow generally balanced the inflow showing that about half (58~68%) of total outflow was lost by surface drainage. Water and nutrient export are more in surface-water irrigation paddy than in ground-water irrigation paddy. The reasons might be more irrigation water available and easy to use in surface-water irrigation. If irrigation water reduced, it could result in reduction of nutrient export in paddy rice fields, which can save water and protect water quality. However, deviation from conventional standard practices might affect the rice yield and further investigations are necessary.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.599-602
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• 2003

The objective of this study is to analyze the function of the paddy-field in purifying water quality. This study was carried out is based on the data in the six case studies. To improve purification function of paddy field, the following farming management is required. 1) A guideline to control the inlet and outlet of the paddy plot is need to minimize drainage water by means of a reasonable irrigation management. 2) A guideline for fertilizer application in consideration of loading nutrients dissolved in irrigation water. 3) The reuse system of agricultural drainage water is required to minimize impacts on water quality of surface water(reservoir and river).

• Current Research on Agriculture and Life Sciences
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• 제15권
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• pp.39-46
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• 1997

In 1996, a cold-water damage occured in the paddy field at the downstream of the Umoon dam. To study the cause and the preventive measures of the cold-water damage a field study was performed during the growing season of 1997. Field measurements such as water temperatures at reservoir, irrigation canal and in the paddy field were made. As a result, there was no cold-water damage due to the right irrigation water management practice in 1997. The cold-water damage is possible to happen, however, and the preventive measures were provided.

• 한국농공학회논문집
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• 제51권1호
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• pp.33-39
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• 2009

A number of fallow paddies field continues to increase because of adverse agricultural circumstance such as upsurge income of foreign products, increase of labor costs in local community, imbalance between productivity and profitability etc. Such fallow paddies are necessary to be protected against weeds and trees. If fallow paddies are not managed, it will be devastated and needed cost for re-cultivation. Therefore, management of gradually increased fallow paddy fields should be conducted. In this study, the effect of plants growth inhibition and water quality purification through the control of flood in fallow paddy were examined in an experimental field. The managed and unmanaged fallow paddies through the control of water depth were constructed in the experimental field. The monitoring was conducted from 2005 to 2007. As the result, the managed fallow paddies were more effective than the unmanaged ones on the growth inhibition and water purification. In addition, when the fallow paddy is managed with regular water depth, it was the most effective in the plants growth inhibition.

• 한국농공학회지
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• 제44권3호
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• pp.146-156
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• 2002

The objective of this study was to develop a modified CREAMS model for paddy field conditions. The model simulates daily balance of water and nutrient from irrigated paddies using meteorological, irrigation, and agricultural management data. The model simulates daily evapotranspiration of paddy using Penman equation and determines daily flooding depth changes. Total nitrogen and phosphorus concentrations within flooding water, surface runoff, and leaching water from a paddy field also can be simulated. Parameters of the model were calibrated using observed data of the Agricultural Experiment Station of the Seoul National University in Suwon Korea. The model was applied for the irrigation period of paddy field in Gicheon area when 1,234 mm annual rainfall was occurred. The simulated losses of the total nitrogen and total phosphorous were 11.27 kg/ha and 0.98 kg/ha, respectively. There was a good agreement between observed and simulated data. It was found that CREAMS-PADDY model was capable of predicting runoff and nutrient losses from irrigated paddy fields.