Ideas such as "crop and soil weatherproofing," the "row support system," and the "tillage commandments," exemplify the practicality of the soil/root maintenance program that serves as the foundation for Schriefer's highly-successful "systems approach" farming. Schriefer was a pioneer in developing an awareness of the relation of tillage to soil fertility, focusing on three major soil basics ? soil aeration, soil water, and soil decay. This book covers such topics as soil chemistry, plant and soil dynamics, above- and below-ground plant management, row support fertilization, zone-tillage, disc-chiseling, and more. He focuses on reducing "yield-limiting factors" such as seed selection, excessive tillage and a dependence on technology.