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Gypsum Use to Reduce P Loss From Agricultural Fields 2013

Source Publication:Bulletin No. 680 Alabama Agricultural Experiment Station, 2013 William Batchelor, Director Auburn University Auburn, AL
Primary Author:D.B. Watts, H.A. Torbert, C.C. Mitchell
Institution:Alabama A&M and Auburn University
Research Site:Sand Mountain Research and Extension Center, E.V. Smith Research and Extension Center Field Crops Unit
City:Crossville, Shorter
State:Alabama
Date/Year:2013
Focus:Gypsum Use to Reduce P Loss From Agricultural Fields
Category:Proceedings & Bulletins & Research Reports
Crop:Bermudagrass
Download:Gypsum Bulletin_2013.pdf (2.3 MB)
Reported Results:
Conclusions
Repeated manure use on agricultural fields at agronomic N rates has created a redistribution of P in soils which increases the risk of P contribution to surface waters. If manure use continues at current rates, refined prescriptions will be needed to reduce and prevent P losses from deteriorating surface water quality. Gypsum use as a soil amendment seems promising as a BMP to reduce P losses from agricultural fields. The current study provides valuable information needed to fine-tune current prescriptions for BMPs needed to maintain environmental sustainability.
 
Recommendations
Where P application rate or P application method will create an unacceptable risk for runoff according to the Alabama P index, either agricultural or FGD gypsum may be used as a BMP at the time of P application. A recommended rate of 2-ton acre1 is needed to obtain the greatest benefit of reducing the threat of P loss from pastures fertilized with poultry litter.
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