A study on the automatic irrigation control system in the vinyl-house cultivation utilizing microcomputer
1989
Kim, C.S. | Kim, J.H. | Chung, S.W. (Sanju Agriculture Junior Coll., Sanju (Korea R.))
The purpose of this study was to develop a computer operated automatic drip irrigation system for application in vinyl-house cultivation. The T-type ice compensation wire was used to measure the temperature. The voltage level measured up to 0.02 volt was used as input to an 8-bit A/D converter. A specially devised tensiometer was used to content the watering system. When the needle of the pressure gauge reaches the lower threshold position it turns on the pumping system and turns off when it reaches higher threshold position. In order to use the multiple gypsum blocks for one transducer, reed relays and a D/O board were used to make the sequential switching possible. It was possible to automate the trickle irrigation system for the whole growth period of vinyl-house crops with the help of microcomputer. In terms of furrow irrigation, the irrigation water consumption was the smallest, 2.8 times less than conventional method of surface trickle irrigation, 3.4 times less than subsurface trickle irrigation method. In terms of productivity of cucumber, there was a drop in productivity when compared to furrow irrigation method, 7.2 % for surface trickle irrigation, 27.4 % for subsurface irrigation method
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