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United States Department of Agriculture

Agricultural Research Service

Research Project: NUTRIENT CYCLING AND UTILIZATION ON ORGANIC DAIRY FARMS Title: Relationship between phosphorus forms and phosphatase activity in soils amended with poultry manure

Authors
item Waldrip, Heidi -
item He, Zhongqi
item Honeycutt, Charles
item Erich, M. Susan -

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: August 3, 2009
Publication Date: September 15, 2009
Citation: Waldrip, H.M., He, Z., Honeycutt, C.W., Erich, M. 2009. Relationship between phosphorus forms and phosphatase activity in soils amended with poultry manure [abstract]. American Society of Agronomy Meetings. On-line publication.

Technical Abstract: Up to 80% of the phosphorus (P) in poultry manure (PM) can be present in organic forms that require mineralization via phosphatase enzymes prior to plant utilization. To determine the correlation between soil P distribution and phosphatase activity we sequentially extracted two Maine soils amended with poultry manure with H2O, 0.5 M NaHCO3, 0.1 M NaOH, and 1.0 M HCl at 0 (control), 100 (PM100), or 200 (PM200) mg manure P per kg soil during 108 days of aerobic incubation. We determined activities of acid (AcPase, pH 6.5) and alkaline (AkPase, pH 11.0) phosphomonoesterase, and phosphodiesterase (PDase), and quantitated inorganic (Pi) and organic (Po) P in each fraction. Correlation between PDase and P fractions was not consistent between soils or treatments and was largely insignificant. Significant positive correlations were found between both types of phosphomonoesterase and Po in NaHCO3- and NaOH-extracts in the low-indigenous P Newport soil with Control and PM100; however, there was no correlation with the high indigenous-P Caribou soil or when Newport soil was amended with PM200. These observations suggest that Po stimulates phosphomonoesterase activity when soil P levels are low but high Pi concentrations may inhibit activity or decouple this relationship.

Last Modified: 10/25/2014
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