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Ammonia Sorption and Retention by Plant Residue Materials¹

ABSTRACT

Investigations were conducted to measure the quantities of NH₃ physically sorbed and the quantities of sorbed NH₃ retained against evacuation by some common plant residues when exposed to NH₃ in a dry condition and with different amounts of moisture. With increases in NH₃ pressure both moist and dry samples of each plant residue physically sorbed increasing quantities of NH₃. When saturated with NH₃, evacuated, and then saturated a second time each dry plant material sorbed less NH₃ during the second than during the first saturation. Increases in moisture content resulted in increases in physical sorption of NH₃ across the entire range of partial pressures of NH₃ employed. Saturation of the moist plant residue samples with NH₃ resulted in some measurable increases in NH₃ content after evacuation.

¹ Contribution from the Dept. of Soil Science, North Carolina Agr. Exp. Sta., N. C. State College, Raleigh. Published with the approval of the Director as paper No. 1630 of the Journal Series.

² Formerly Graduate Assistant, now Professor of Soil Chemistry, Wisconsin State University, Platteville, Wis. and Professor of Soil Science, North Carolina State College.

Received for publication September 23, 1963. Accepted for publication March 18, 1964.