HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bauer, P. J. Articles by Vanotti, M. B. Search for Related Content PubMed Articles by Bauer, P. J. Articles by Vanotti, M. B. Agricola Articles by Bauer, P. J. Articles by Vanotti, M. B. Related Collections Phosphorus Soil Fertility and Productivity

Phosphorus Management

Agronomic Effectiveness of Calcium Phosphate Recovered from Liquid Swine Manure

USDA-ARS, Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas St., Florence, SC 29501-1242

^* Corresponding author (phil.bauer{at}ars.usda.gov)

A new manure treatment technology developed as an alternative to anaerobic lagoons on swine (Sus scrofa domesticus) farms includes solid-liquid separation and subsequent recovery of soluble P as calcium phosphate from the wastewater. The objective was to determine the agronomic effectiveness of this calcium phosphate material. A greenhouse study was conducted with annual ryegrass (Lolium multiflorum Lam.). Three fertilizer materials were evaluated: the recovered P in two particle sizes (0.5–1.0 and 2.0–4.0 mm), and commercial triple superphosphate (TSP). Fertilizer rates were 0, 22, 44, 88, and 176 mg P kg^–1 soil. Three harvests of the ryegrass were made at 2-wk intervals. Total P uptake increased linearly with application rate for all three fertilizer materials. At the highest application rate, total P uptake was 37.8 mg pot^–1 for TSP, 26.2 mg pot^–1 for the recovered P with small particle size, and 9.0 mg pot^–1 for the recovered P with large particle size. Chemical analysis of the recovered P material revealed that over 99% of the P₂O₅ in the recovered calcium phosphate was plant available P, mostly as citrate-soluble. Mehlich-3 extractable soil P at the end of the experiment indicated that little of the large particle size of recovered P material dissolved and became available during this short 10-wk study. The recovered calcium phosphate appears to have potential as a fertilizer source.

Abbreviations: ICP–AES, inductively coupled plasma–atomic emission spectrometer • SSP, single superphosphate • TSP, triple superphosphate

Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply approval of a product to the exclusion of others that may be suitable.

Received for publication December 15, 2006.

This article has been cited by other articles:

				M. S. Massey, J. G. Davis, J. A. Ippolito, and R. E. Sheffield Effectiveness of Recovered Magnesium Phosphates as Fertilizers in Neutral and Slightly Alkaline Soils Agron. J., March 4, 2009; 101(2): 323 - 329. [Abstract] [Full Text] [PDF]

				A. A. Szogi and M. B. Vanotti Removal of Phosphorus from Livestock Effluents J. Environ. Qual., February 6, 2009; 38(2): 576 - 586. [Abstract] [Full Text] [PDF]

				M. B. Vanotti and A. A. Szogi Water Quality Improvements of Wastewater from Confined Animal Feeding Operations after Advanced Treatment J. Environ. Qual., September 2, 2008; 37(5_Supplement): S-86 - S-96. [Abstract] [Full Text] [PDF]