Abstract
ABSTRACT SUBSURFACE application of fertilizer in no-till cropping systems to increase efficiency of use must be accomplished within constraints of minimum soil and crop residue disturbance. We evaluated a number of applicator knife and coulter combinations representative of those currently being used for this purpose. Applicator performance was measured as width of soil disturbed along the path of implement travel, as a function of soil penetration depth, travel speed, and soil water content. Width of soil disturbance increased on the average over all applicators, with an increase in each of these factors. Soil water content proved to be the more critical in light of its effect on adherence of the heavy clay soil to applicator surfaces. Applicators were ranked according to the amount of soil disturbance caused under each set of operating conditions. Rankings provided a means of relating the physical characteristics of applicators to relative level of performance, hence a guide in selecting adequate design criteria for their improvement.
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