The invention discloses a
sprayer for a farmland, and relates to novel farmland operation machinery. Key points of the technical scheme in the invention are as follows: the
sprayer for the farmland comprises a
sprayer body; the sprayer body is provided with a water suction pump, a
medicine storage box, an
infusion pump, a spray rod, a liquid mixing
air pump and a pulse valve; the sprayer body is provided with a liquid mixing box; the sprayer body is provided with a pressure limiting device; the sprayer body is provided with a water
inlet channel, a filter net and a
hydraulic pressure box; a cavity and a barrier plate are arranged in the
hydraulic pressure box; the barrier plate is provided with an adjusting spring; the barrier plate is provided with an adjusting rod; the
infusion pump is provided with a communication pipeline; the communication pipeline is provided with a non-rising-stem valve; and the adjusting rod is provided with a driving mechanism. Due to arrangement of the mixingair pump and the liquid mixing box,
medicine liquid is sufficiently mixed with a
water body, so that the use effect of the
medicine liquid is better; due to arrangement of the pressure limiting device, the amount of the medicine liquid sprayed by the sprayer is relatively steady; and, due to arrangement of the
hydraulic pressure box, the adjusting rod and the driving mechanism, the
mixing ratio of the medicine liquid to the
water body can be relatively steady.