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Dep. of Applied Ecology and Environmental Sciences, 5722 Deering Hall, Univ. of Maine, Orono, ME 04469-5722.
* Corresponding author (ohno{at}maine.maine.edu).
ABSTRACT
This study was conducted to investigate the effect of dissolved organic matter (DOM) extracted from common soil amendments and citric acid on the P sorption of an acidic soil. Hairy vetch (Vivia billosa L.) and crimson clover (Trifolium incarnatum L.) were used as sources for green manure-derived DOM. Cattle manure (Bos taurus) and poultry manure (Gallus domesticus) were used as sources for animal manure-derived DOM. The negative charge density of the water-soluble DOM ranged from 4.6 to 13.4 mmolc g–1 C. Estimated molecular weight ranges were 710 to 850 for the green manure DOM and 2000 to 2800 for the animal manure DOM. Phosphorus sorption experiments were conducted at 40 mmol P kg–1 soil and 0, 5, 10, 15, and 20 mM total soluble carbon (Crs) for each green and animal manure source. The DOM extracted from vetch and clover, as well as citric acid, inhibited P sorption in the order citric acid > clover > vetch. The DOM extracted from the animal manures did not affect P sorption. The ability of the green manure DOM to inhibit P sorption was related to its ability to react with soil Al through ligand exchange reactions at lower DOM concentrations and through complexation reactions at higher DOM concentrations. The average ratio of Al solubilization to P sorption inhibition on a molar basis was 1.76 ± 0.44. Ultraviolet absorbance and fluorescence data suggested that the higher molecular weight of the animal manure derived-DOM was a factor in its inability to react with soil Al. The results of this study suggest that management systems that use green manures may increase the availability of P by decreasing the sorption of added P to soils.
Contribution from the Maine Agric. Forest Exp. Stn., Journal no. 1983.
Received for publication October 10, 1995.
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