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Composition and Reactions of Liquid Manure (Gülle), with Particular Reference to Phosphate: III. pH-Buffering Capacity and Organic Components¹

ABSTRACT

pH titrations of gülle samples disclosed differences of composition related to origin, age, and storage conditions prior to collection. Buffering capacities depended partly on ammonium bicarbonate content, which fluctuated from sample to sample but increased during laboratory storage, at 4C or room temperature. Organic compounds both in solution and solid phases buffered in the lower pH ranges, in some instances having greater influence on total buffering capacity than any other factor. The nature as well as the amount of these compounds differed between samples. Many were modified or decomposed during storage at laboratory temperature. Inorganic components of the solid phase, such as ammonium, magnesium, and calcium phosphates, as well as calcium carbonate, made significant though relatively minor contributions.

Tyrosine was identified in gülle solutions by TLC, while other amino acids, glutamic acid and histidine, were likely constituents. There were no simple carboxylic acid anions of the type that inhibit phosphate uptake by iron oxides.

Key Words: cattle manure • amino acids

¹ Contribution from Institut für Bodenkunde, Technische Universität München, 8050 Freising-Weihenstephan, West Germany.

² Senior Research Scientist, Division of Soils, CSIRO, Private Bag No. 2, Glen Osmond, South Australia 5064, and Professor of Soils, Institut für Bodenkunde, Technische Universität München.

Received for publication August 13, 1975.

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