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Effect of Increasing Fertilizer Concentration on Exchangeable Cation Status of Soils¹

ABSTRACT

In a 10-year experiment, comparisons were made of the effects of fertilizers of 1-2-2 N, P₂O₅, and K₂O ratios, applied at the rate of 1 ton of 4-8-8 an acre annually, or its equivalent in higher grades up to and including the 12-24-24, on the exchangeable cation status of two soils. The most significant general effects of all these grades were the lowering of pH values, increase in exchangeable H, reduction in exchangeable Ca and Mg, and increase in exchangeable K. There was little in the evidence to indicate any bad effects that could not readily be overcome by the use of Mg-containing liming materials as correctives.

¹ Journal Series paper of the New Jersey Agricultural Experiment Station, Rutgers University, the State University of New Jersey, Department of Soils. Paper prepared for annual meeting of the Soil Science Society of America, Cincinnati, Ohio, November 17–21, 1952.

² Research Specialist and Assoc. Research Specialists, Soils, respectively.