Design of irrigation forecast and automatic control system based on soil matric potential
ZHANG Youliang1,2, FENG ShaoYuan1,2, WANG Fengxin2*
1.School of Hydraulic Energy and Power Engineering, Yangzhou. Jiangsu University, Yangzhou 225009, China; 2.Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
An irrigation forecast and automatic control system was designed based on soil matric potential to make the system simple, cheap and widely applicable. By using pressure gauge with electric contact to measure the pressure of tensiometer, the irrigation upper and lower limits can be easily set with the knob on the pressure gauge for different crops, growth stages, and irrigation methods based on the soil matric potential. When the soil matric potential reaches the upper and lower limits, the automatic irrigation can be achieved with the pressure gauge and automatic control circuit. The irrigation duration, amount, and frequency can be recorded and stored with single chip microcomputer and displayed by remote-transmitting water meter and liquid crystal display during irrigation. The laboratory test show that this irrigation forecast and automatic control system is reliable and feasible. Moreover, based on the soil matric potential, the irrigation upper limit is approximately equal to -8 kPa for silt loam soil.
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