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This article in SSSAJ

  1. Vol. 33 No. 5, p. 725-729
    Received: Apr 17, 1969



Soil Properties Affecting the Sorption of Atmospheric Ammonia1

  1. Ronald B. Hanawalt2



At controlled atmospheric-level ammonia concentrations, ammonia sorption from the atmosphere was weakly correlated with increasing cation exchange capacity and percent clay. Alteration of organic matter content and soil acidity produced only slight changes in sorption rates. These data indicate that lack of bonding sites per se does not limit the sorption rate. In air dry soil the major portion of the sorption occurs in the uppermost 0.5 cm. Sorption rates were closely related to increasing air permeability and moisture content. Since atmospheric ammonia concentration, air velocity across the soil surface, and temperature also strongly influence sorption rates, it is concluded that sorption of atmospheric ammonia by soils is primarily governed by those factors which effect the rate of supply of ammonia to the soil surface and the fraction of the ammonia molecules which are actually captured.

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