The invention discloses a precise variable
irrigation and fertilization implementation method for a circular sprinkling
machine. The method comprises the steps: according to an
irrigation and fertilization prescription map of a managed
land parcel, dividing a plurality of groups of fan-shaped spraying areas by taking a central fulcrum shaft of a circular sprinkling
machine as a center; if a single
irrigation and fertilization prescription is adopted in the fan-shaped area, dividing the fan-shaped area into a large
management area, and setting a unified set value of a percentage
timer of the circular sprinkling irrigation
machine, the working flow of a
fertilizer injection pump and the duty ratio of a
nozzle electromagnetic valve; if the fan-shaped area is composed of a plurality of different irrigation and fertilization prescriptions, dividing the fan-shaped area into a plurality of small management areas, and setting a unified percentage
timer set value and a unified
fertilizer injection pump working flow, wherein the small management areas correspond to different
electromagnetic valve duty ratios; obtaining the residual clear
water irrigation depth by subtracting the water and
fertilizer liquid spraying depth from the designed irrigation depth of each
management area, and then determining the clear water spraying percentage
timer set value and the
electromagnetic valve duty ratio. According to the invention, precise variable irrigation and fertilization of farmland scale management plots can be realized by using the circular sprinkling machine.