Patent ID: 9258940
Filing Date: 2016-02-16
CPC Classification: A01C

Claim Text:
1. A method for reducing set roll of potato seed pieces when planting potato seed pieces at a wide range of traveling speed greater than 3 miles per hour, using a potato planter having: a longitudinal axis extending substantially horizontally along a direction of travel thereof; a furrow opening shoe mounted thereto along said longitudinal axis; a pair of furrow closing devices mounted thereto astride said longitudinal axis behind said furrow opening shoe; a seed drop chute mounted thereto, along said longitudinal axis between said furrow opening shoe and said pair of furrow closing devices; said seed drop chute having a seed piece release axis therein extending downward, substantially vertically; a press wheel mounted thereto along said longitudinal axis between said seed drop chute and said furrow closing devices; said press wheel having a wheel face and rolling axis extending generally perpendicular to said longitudinal axis; said press wheel having a soft central cylindrical portion rolling over said longitudinal axis and harder outer cylindrical edges on each sides of said soft central cylindrical portion, each of said harder outer cylindrical edges rolling on each sides of said longitudinal axis; a deflector mounted thereto along said seed piece release axis above said longitudinal axis, said deflector having a deflecting surface intersecting said seed piece release axis and being oriented downward and backward at an angle such that a reflection of said seed piece release axis against said deflecting surface extends toward a region along said longitudinal axis beneath a forward half portion of said press wheel; said method being characterized by the following steps: while moving said potato planter at said traveling speed, a) using said furrow opening shoe, simultaneously opening a furrow in a soil surface, said furrow having a bottom surface extending along said longitudinal axis, a width dimension extending laterally on each sides of said longitudinal axis and a depth dimension extending below said soil surface; and forming raised sides of loose soil above said soil surface on both sides of said furrow; b) releasing potato seed pieces from said seed drop chute, downward at timed intervals along said seed piece release axis; c) rolling said soft central cylindrical portion of said press wheel over said furrow and defining a seed-receiving pocket beneath said forward half portion of said press wheel with a lower surface of said forward half portion of said press wheel, said raised sides of said furrow and said bottom surface of said furrow, said seed-receiving pocket being centered on said longitudinal axis and having a tapering cross-section with a wide opening facing said direction of travel and a narrow bottom end in a downstream region of said furrow beneath said press wheel; d) rolling said harder outer edges of said press wheel over said raised sides of loose soil, flattening said raised sides of loose soil and lowering said soft central cylindrical portion of said press wheel downward to a potato seed height above said bottom surface of said furrow, and pushing lateral flows of said loose soil from said raised sides inward toward said longitudinal axis, closing said bottom end of said seed-receiving pocket; e) guiding each of said potato seed pieces along a two-vector trajectory, comprising guiding each of said potato seed pieces from a first vector coinciding with said seed piece release axis; deflecting each of said potato seed pieces backward and downward away from said seed piece release axis along a second vector coinciding with said reflection, and projecting each of said potato seed pieces into said seed-receiving pocket; f) simultaneously rolling said soft central cylindrical portion of said press wheel over and in contact with each of said potato seed pieces, and applying lateral pressure against each of said potato seed pieces from said lateral flows of loose soil from said step of flattening said raised sides of loose soil, and checking a set roll of each of said potato seed pieces without bruising said potato seed pieces; and g) using said closing devices, moving soil from said soil surface behind said press wheel over said furrow, closing and hilling said furrow over said potato seed pieces.