For Further Reading

Brown, J.R., Editor. 1987. Soil testing: Sampling, correlation, calibration and interpretation. Special Pub. 21. Soil Science Society of America, Madison, WI.

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

Stelly, M., Editor. 1977. Soil testing: Correlating and interpreting the analytical results. Special Pub. 29. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, Madison, WI.