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Enrichment of the Atmosphere with Nitrogen Compounds Volatilized from a Large Dairy Area¹

ABSTRACT

A dairy cow population of 143,000 in an area of 150 km² enriched the atmosphere with distillable N (mostly NH₃) over an area in excess of 560 km². Over an area of 35 km², where cow population density was approximately 1,600 cows/km², the concentration of distillable N in the atmosphere was between 20 to 30 times greater than at a control site outside the dairy area. Highest concentrations of N were associated with wet corral surfaces and favorable evaporative conditions. Approximately 20% of the total N absorbed by acid-surface traps in the dairy area was nondistillable N while filtered air samples contained 5% or less. Rainfall delivered three times as much N to the land surface inside than outside the dairy area.

Key Words: distillable N • nondistillable N • atmospheric NH₃

¹ Contribution from the ARS, USDA, and the Calif. Agr. Exp. Station, Riverside.

² Soil Scientists, USDA, and Staff Research Associate, Univ. of California, Riverside. 92502.

Received for publication April 17, 1972.