Patent ID: 7739969
Filing Date: 2010-06-22
Classification: A01C,Y10S

Abstract:
1. An ammonia knife assembly for mounting onto a toolbar for moving across ground having a level in a field and for applying ammonia into a bottom of a trench, the assembly comprising: (a) a substantially vertical knife for piercing ground and creating a trench as the knife is pulled across the ground, the knife having a leading edge, a trailing edge, and two sides, the knife further having a midpoint that moves at ground level during use, a forwardly projecting portion below the midpoint that moves below ground level during use, and a mounting portion above the midpoint that moves above ground level during use; (b) an ammonia supply tube attached to the knife, the tube having an outlet at the trailing edge of the forwardly projecting portion of the knife for applying ammonia at the bottom of the trench created by the knife; and (c) a substantially horizontal shield attached to the knife, the shield positioned about two to twelve inches above the midpoint of the knife, the shield having a rounded portion extending forwardly from the leading edge and two side portions extending outwardly from the sides of the knife and tapering inwardly from front to back for deflecting dirt particles that are thrown upwardly and outwardly from the leading edge of the knife as the knife pierces the ground.