The effect of certain fertilizers on nitrification
1924
Brown, P.E. | Gowda, R.N.
The conclusions which may be drawn from these experiments on the effects of manure, clover hay, phosphatic and nitrogenous fertilizers on nitrification in the Carrington loam soil in the greenhouse are as follows: Nitrification was increased by applications of manure up to the maximum treatment of 36 tons per acre, as shown by the nitrate content of the soil. The increases from the larger applications were not proportional to the amount of the application. The nitrifying power of the soil was increased by the manure up to the 36 ton amount, but the increases were not proportional to the amounts used. There was no indication of denitrification in the soil receiving the largest amount of manure (36 tons). Rock phosphates increased the nitrate content and the nitrifying power of the soil. Acid phosphate stimulated the nitrifying power of the soil and gave a greater nitrate content. Sodium nitrate increased the nitrate content of the soil and enhanced its nitrifying power. Clover hay gave a little effect on the nitrate content of the soil, but increased its nitrifying power. Small applications of a 2-8-2 complete fertilizer gave an increase in the nitrate content of the soil and stimulated the nitrifying power to a small extent. Periods of intensive nitrification seem to alternate with periods of lesser action, the length of these periods and the time of their occurrence varying with the treatment of the soil.
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