1. Influence of long-term soil fertility treatments on weed species in winter wheat;Banks;Agron. J.,1976
2. The Nature and Properties of Soils;Brady,1984
3. Plant uptake and chemical extractions for evaluating potassium release characteristics of soils;Conyers,1969
4. Effects of 50 years of fertilization with phosphorus and potassium on soil test levels and yields at six locations;Cope;Soil Sci. Soc. Am. J.,1981
5. Effects of long-term management on physical and chemical properties of the Coshocton watershed soils;Edwards,1973