References

Black, C. A., Soil Plant Relationships. 1957. John Wiley and Sons, Inc., New York.

Buckman, H. L., Brady, N. C. The Nature and Properties of Soils. 6th Ed. 1960. The Macmillian Company, New York.

Ferguson, Richard B. Krista DeGroot, Editor. Nutrient Management for Agronomic Crops in Nebraska, EC 01-155-S.  2000.  University of Nebraska-Lincoln Extension Service.

Shapiro, Charles A., Richard B. Ferguson, Gary W. Hergert, Achim R. Dobermann, and Charles S. Wortmann.  Fertilizer Suggestions for Corn.  NebGuide G174, Rev. 2003.  University of Nebraska-Lincoln Extension Service.