The invention relates to a gas-assisted layered deep fertilizing
machine and a using method. The gas-assisted layered deep fertilizing
machine comprises a rack, furrow openers, layered deep fertilizing devices and a gas-assisted
fertilizer discharging device, wherein the furrow openers, the layered deep fertilizing devices and the gas-assisted
fertilizer discharging device are installed on the rack; each layered deep fertilizing device comprises a material discharging device, a cylinder fixedly connected with the rack and a
fertilizer discharging
auger installed in the cylinder, a closed passage is formed between each fertilizer discharging
auger and the corresponding cylinder, a discharging port of each closed passage is communicated with at least two fertilizer discharging pipes, and thedischarging end of each fertilizer discharging
pipe faces backwards and is located behind the furrow openers. By means of the gas-assisted layered deep fertilizing
machine, fertilizer granules fall into the soil which is crushed by the furrow openers and then restored, the layered deep fertilizing precision is effectively improved, and the layering failure caused when the fertilizer granules fallto the bottoms of furrows is avoided; the fertilizer discharging augers adopt fixed-screw-
pitch and variable-
radius design so that the fertilizer granules can achieve spiral downward acceleration with the assistance of
gas pressure, the initial speed of discharging the fertilizer granules is increased, and meanwhile the fertilizer granules are blended in the acceleration process and discharged more uniformly.