Soils - Part 10: The Scientific Basis for Making Fertilizer Recommendations

Bray, R.H. 1944. Soil-plant relationships. I. The quantitative relation of exchangeable K to crop yields and to crop response to potash additions. Soil Sci. 58:305-324.

Bray, R.H. 1945. Soil-plant relationships. II. Balanced fertilizer use through soil test for K and P. Soil Sci. 60:464-473.

Bear, F.E., A.L. Prince and J.L. Malcolm. 1945. Potassium needs on New Jersey soils. New Jersey Agric. Exp. Sta. Bul. 721.

Graham, E.R. 1959. An explanation of theory and methods of soil testing. MO Agric. exp. Sta. Bul. 734.

Hergert, G.W., W.L. Pam, D.R. Herggins, J.H. Grove, T.R. Heck, F.J. Pierce, and E.J. Saddler (eds.), Adequacy of Current Fertilizer Recommendations for Site/Specific Management in State of Site Specific Management for Agriculture, American Society of Agronomy, Madison, WI, 1997, pp 283-300.

Liebhardt, W.C. 1981. The basic cation saturation ratio concept and lime and potassium recommendations on Delaware’s coastal plain soil. Soil Sci. Soc. Am. J. 45:544-549.

McLean, E.O., R.C. Hartwig, D.J. Eckert, and G.B. Triplett. 1983. Basic cation saturation ratios as a basis for fertilizer and liming agronomic crops II. Field Studies. Agron. G. 75:635-639.

Olson, R.A., K.D. Frank, P.H. Grabouski, G.W. Rehm, and Delno Knudsen. 1982. Economic and agronomic impacts of varied philosophies of soil testing. Agron. J. 74:492-499.