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Influence of fertilizers and soil amendments on soil acidity

Skinner, J.J., Beattie, J.H.
Agronomy journal 1917 v.9 no.1 pp. 25-35
field crops, soil pH, fertilizer application, soil amendments, sulfur fertilizers, carbonates, potato starch, animal manures
In an experiment growing wheat, rye, clover, timothy, corn, cowpeas, and potatoes, conducted on a heavy silty clay loam at Arlington, Va., calcium sulfate, ferrous sulfate, manganese sulfate, potassium sulfate, and potassium sulfide added singly to the soil annually for five years increased its acidity. Magnesium carbonate decreased the acidity of the soil. Soil fertilized with sodium nitrate was less acid than the untreated soil or soil fertilized with acid phosphate or potassium sulfate. Acid phosphate fertilization increased the acidity of the soil, but not as much so as potassium sulfate. Organic materials affected the soil differently as to causing acidity. Starch caused increased acidity; stable manure slightly increased acidity, which was still greater with manure leached of its soluble organic and inorganic substances. The leachings from manure produced less acidity than the untreated soil and less than the whole manure or leached manure. The nature of the decomposition of the organic material in the soil and the character of the life processes in the soil affects the influence of such substances on soil acidity.