Agricultural Extension Service, South Dakota State College
The use of fertilizer is rapidly becoming recognized as an essential part of a good soil management program. Fertilizers, however, are not a substitute for other well established soil management practices. A good rotation is the foundation of a sound fertility and soil building program. Commercial fertilizer should be used to correct the plant food deficiencies that normally occur under our best soil management systems. It should be emphasized that the fullest use be made of legumes and grasses, crop residues and. manure to maintain the organic matter supply of the soil and to reduce the amount of fertilizer required for maximum crop production.
Puhr, Leo; Shubeck, Fred; Ladd, Leonard; and Switzer, Merle, "Fertilizer Recommendations for S.D. Crops" (1954). SDSU Extension Circulars. 703.