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Leaching and Gaseous Losses of Nitrogen From Some Nontilled California Soils¹

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(NO₃)₂. Manure was an inefficient source of N. Substantial volatile losses of NH₃ occurred with urea on calcareous as well as acid soils. In comparative studies of atmospheric NH₃ loss, the order of magnitude was urea>(NH₄)₂SO₄>NH₄NO₃> urea-formaldehyde.

² Associate Chemist, Horticulturists, and Laboratory Technician, respectively. Appreciation is expressed to G. F. Liebig for helpful suggestions.

Received for publication February 11, 1963.