Abstract: A system, method, and computer program for storing a plurality of usage conditions to a data set for retrieval by a single query statement, comprising the steps of converting a usage condition into a first normal form representation, minimizing said first normal form representation, transforming said minimized first normal form representation into a second normal form representation, and storing said second normal form representation in said data set. The method wherein the steps comprising said storing step are repeated until each said usage condition is stored in to said data set and appropriate means and computer-readable instructions.

Abstract: This invention relates to a planter guide attachment designed to hold and align conventional corn, soybean planters, or other units on the upper area of a ridge of soil formed by previous cultivation-ridging processes as known in Ridge-Till farming. The unit provides a mounting shaft having a pair of coned blades mounted thereon to allow the tapered faces of the disc blades to hug the sides of the ridges for proper planter alignment. The shaft blade construction is hingedly attached to a mounting bar which is vertically adjustably attached to a tool bar extending transversely of the rear of a towing vehicle for mounting a plurality of guide units thereon. A knee spring-action mechanism is provided to load the shaft, disc structure to maintain the same in ground contacting position, and allow the same to override obstacles that may be in the ridge, and thereafter return the same into ground-contacting position along the sides of the ridge.