Development and Application of a Crop Water Demand Measuring System for Pits in Farmland
To address the current situation of outdated,inefficient and non universal automatic measuring instruments for measuring crop water demand in agricultural pits,a high-precision automatic measuring instrument for measuring crop water demand(evapotranspiration)in pits has been designed and developed.The instrument operates on the principle of automatically measuring water levels using a needle at hourly intervals,featuring a separate structure for the host and sensor,and an innovatively designed water inlet detection circuit.This design resolves measurement errors caused by needle polarization and changes in water conductivity.The applyment of a wedge-designed,maintenance-free clearance screw provided guarantee for long-term stable operation of sensors.Testing results indict that the instrument has a measurement resolution of 0.01 mm,the measurement error within a range of 100 mm is under 0.01 mm,and a travel time accuracy error under 1 minute/month.The instrument has been applied in a large-scale comprehensive measurement pit at the Irrigation test station,stable and reliable for a long time,and has good promotion and application value.
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