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Influence of Fertilizers on the Concentration of the Soil Solution

Fertilizer Research Division, Bureau of Chemistry and Soils U. S. Department of Agriculture, Washington, D. C.

ABSTRACT

A study was made of the action of fertilizers in increasing the effective, or combined ionic and molecular, concentration of the soil solution from a Norfolk sandy loam soil and a Cecil clay loam soil. The same application of a fertilizer material increases the effective concentration of the soil solution in the Norfolk soil much more than in the Cecil soil, but the materials used in the tests fall in the same order for both soils when arranged according to their influence in changing the concentration of the soil solution. This arrangement in descending order is as follows: NaNO₃, (NH₄)₂SO₄, KCl, K₂SO₄, NH₄H₂PO₄, and Ca(H₂PO₄)₂·H₂O. The influence of a mixed fertilizer on the effective concentration of a soil solution depends on its composition and not on its total content of the plant food elements.