Synopsis Leaching and volatile losses of N from some southern California soils were studied when various nitrogenous fertilizers were broadcast and unincorporated. Under sprinkler irrigation, substantial leaching losses occurred with Ca(NO 3 ) 2 . Manure was an inefficient source of N. Substantial volatile losses of NH 3 occurred with urea on calcareous as well as acid soils. In comparative studies of atmospheric NH 3 loss, the order of magnitude was urea>(NH 4 ) 2 SO 4 >NH 4 NO 3 > urea‐formaldehyde.
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Harding et al. (1963) studied this question.
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