Ammonia applicator

Claim 1

IN AGRICULTURAL APPARATUS FOR SUBSURFACE INTRODUCTION OF TREATING FLUIDS INTO THE EARTH, THE IMPROVEMENT COMPRISING A FRAME MEANS AND A PAIR OF AXIALLY ALIGNED, AXIALLY SPACED, GROUND SUPPORT WHEELS THEREFOR, A PLURALITY OF TREATING UNITS CARRIED BY THE FRAME MEANS, SUCH UNITS BEING DISPOSED ALONG THE FRAME MEANS AT POSITIONS SPACED IN PARALLELISM TO THE AXIS OF THE SUPPORT WHEELS WITH SUCH UNITS BEING LOCATED INTERMEDIATE AND AT BOTH SIDES OF THE PAIR OF SUPPORT WHEELS, EACH OF SAID UNITS BEING COMPRISED OF A SUBFRAME DISPOSED BELOW THE FRACE MEANS, SUCH SUBFRAME BEING GENERALLY HORIZONTALLY DISPOSED AND ELONGATED IN A DIRECTION AT RIGHT ANGLES TO THE AXIS OF THE SUPPORT WHEELS, SAID SUBFRAME HAVING FORWARD AND REAR ENDS WITH THE SAME BEING PIVOTED FOR VERTICAL SWINGING MOVEMENT TO THE FRAME MEANS ADJACENT THE FORWARD END OF THE SUBFRAME WITH SUCH PIVOTAL CONNECTION BEING SUBSTANTIALLY FORWARD OF THE AXIS OF THE SUPPORT WHEELS THROUGHOUT VERTICAL MOVEMENT OF THE REAR END OF THE SUBFRAME RELATIVE TO THE FRAME MEANS, SPRING MEANS FOR URGING DOWNWARD SWINGING MOVEMENT TO THE REAR END OF THE SUBFRAME RELATIVE TO THE FRAME MEANS, MEANS FOR LIMITING DOWNWARD SWINGING MOVEMENT OF THE REAR END OF THE SUBFRAME RELATIVE TO THE FRAME MEANS,