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이상훈 ( Sang Hun Lee ),공동혁 ( Dong Hyok Gong ),정기열 ( Ki Yuol Jung ),전현정 ( Hyen Chung Chun ),최영대 ( Young Dae Choil ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
Subsurface drip irrigation system increase waster use efficiency, reduce run off and thus increase crop yields. There are many different types of drip lines to be purchased for irrigation system in a market. Therefore, the proper selection of drip line is a key factor for subsurface drip irrigation systems. The objective of this study was to evaluate the effluent rate of various subsurface drip lines according to the different pressure condition. Four drip lines that are commonly found in a market were selected based on the type and function of dripper. Each drip line was setting with pressure gauges at a certain interval and applied pressure from 0.5 bar to 4.0 bar at 0.5 bar intervals. Effluent rates were evaluated with the ratio of actual effluent amount and retail suggested effluent amount. Effluent rates showed various values based on the type and function of drippers. The drip lines without controlling of water drop had 68.6% of effluent rate at 0.5 bar pressure, which was significantly greater than 11.7% for the drip lines with controlling of water drop. Drip lines with pressure compensation had uniform effluent rate at a certain pressure. However, the effluent rate of non-pressure compensation line linearly increased from 7.2% to 113.1% on the increase pressure. The recommended pressures for subsurface drip irrigation system are ranging from 2.0 bar to 3.0 bar, where it had 97.2% effluent rate. The result of this study showed that the drip lines have various effluent rate, and thus the selection of proper drip lines is very important to function subsurface drip irrigation system along with proper pressure application.
Sang Hun Lee(이상훈),Ki Yuol Jung(정기열),Hyen Chung Chun(전현정),Dong Hyok Gong(공동혁) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Subsurface drip irrigation is highly efficient irrigation system to save water compared to surface irrigation methods. Although the use of soil sensors helps farmers with irrigation scheduling by providing information about when and how much to irrigate, little information is available on soil moisture pattern by subsurface drip irrigation using different soil sensors. Therefore, irrigation scheduling using different soil sensors was evaluated to compare soil moisture wetting pattern at coarse textured soil. Subsurface drip irrigation system was installed at 40cm depth from soil surface with the dripline of 1.6L/hr effluent rate. Study soil has 6% clay content and classified with sandy loam, which was evaluated plant available water content of 10.8%. Subsurface drip irrigation were automatically initiated based on soil moisture sensor and tensiometer. In this study soil water content was fluctuated with irrigation and precipitation event. In the treatment of irrigation by soil moisture sensor, soil water content was well maintained at desired soil water content. However, the variability of soil water content by tensiometer was relatively greater compared to soil water sensor. The results of this study indicate that the irrigation rate and coverage of the irrigation system should be determined on irrigated soil and the amount of water to be applied or target point must be determined based on the irrigation system and the soil water characteristics.