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Some factors affecting losses of ammonia from urea and ammonium sulphate applied to soils

Some factors affecting losses of ammonia from urea and ammonium sulphate applied to soils

J Soil Sci 15(2): 258-272

Urea supplying 100 lb of N/acre was either broadcast on the surface or mixed with four soils (two clay-loams, two sandy-loams) and losses of ammonia were measured when the soils were maintained at 40, 50, or 60 per cent water-holding capacity (WHC) and incubated at 5[degree] or 25[degree] C. Urea and ammonium sulfate were similarly applied to two calcareous soils at 40 per cent WHC and 5[degree] or 25[degree] C. Losses varied most among soils, from 2 per cent of the N applied from an unmanured clay-loam to 13 per cent from an un-manured sandy-loam. Changing temperature and water content affected losses little on average, but their effects differed with different soils. Losses of ammonia were similar from urea and from ammonium sulfate applied to the calcareous soils. Analyses at the end of the experiments showed that (i) nitrite tended to accumulate in the sandy and calcareous soils, accumulation being favored by lower temperature and wetter soil; (ii) ammonia was lost at 25[degree] C from calcareous soils until nine-tenths had been nitrified, and from the neutral sandy soils until half had been nitrified.

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Accession: 014673262

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DOI: 10.1111/j.1365-2389.1964.tb02224.x

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