The mineralization of nitrogen in a soil acidified with sulphur, aluminium sulphate or ferrous sulphate

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Abstract
The mineralization of nitrogen in a soil which had been acidified to different degrees by applying sulphur, aluminium sulphate or ferrous sulphate at three equivalent rates was studied. With low and medium applications of the acidifying materials pH was reduced to a similar extent at each rate by all materials, but with heavy applications sulphur had the least potent, and ferrous sulphate the most potent, effect in reducing pH. During incubation of the treated soils in the absence of added chalk, nitrate and total mineral nitrogen (ammonia plus nitrate) accumulation decreassed, whereas ammonia accumulation increased, with the amount of acidifying agent used. When the acidified soils were incubated with excess of added chalk, nitrate accumulation returned to normal, except where heavy application of sulphur and ferrous sulphate had been made; total mineral‐nitrogen accumulation returned to normal, except where heavy ferrous sulphate application had been made; and ammonia accumulation occurred only where heavy ferrous sulphate application had been made.

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