The application discloses a rice-
crop rotation modular drainage
system suitable for small and micro farmlands along a canal, which comprises a gate frame, vertical guide grooves arranged on the two side columns of the gate frame, a gate plate slidably arranged in the vertical guide grooves, a
handle and a lifting lug fixedly arranged on the top of the gate plate respectively, an electric hoist fixedly arranged on the upper cross beam of the gate frame, a screw rod arranged vertically, the middle part of the screw rod penetrating through the electric hoist, the lower end of the screw rod being hingedly connected with the lifting lug, a rack, a soil
moisture tension meter, a pointer reading table and a control box arranged on the rack respectively, a
potentiometer, a rotating shaft of the
potentiometer being rigidly connected with a pointer rotating shaft of the pointer reading table, a connecting rod mechanism connecting the pointer rotating shaft of a negative pressure gauge of the soil
moisture tension meter and the rotating shaft of the
potentiometer respectively, and a power supply, a controller and a communication module arranged in the control box respectively. Thus, the initial
investment cost can be directly reduced, the drainage requirements of different stages of rice-
crop rotation can be met, the misjudgment caused by experience can be reduced, and the
management efficiency can be improved.