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Gypsum Amendment and Exchangeable Calcium and Magnesium Affecting Phosphorus and Nitrogen in Runoff

Source Publication:	Soil Science Society of America Journal Vol. 70 No. 5, p. 1788-1796
Primary Author:	Favaretto, Norton, Joern, Brouder
Research Site:	USDA-National Soil Erosion Research Laboratory. Lab Experiment with programmable rainfall simulator and eroison pans. The soil was a Miami silt loamcollected from an agricultural field at the ThrockmortonPurdue Agricultural Center.
City:	Lafayette
State:	Indiana
Date/Year:	2006
Focus:	Water Shed (water infiltration and erosion), Nutrie
Category:	Peer Reviewed Papers
Crop:	Not Crop Specific
Reported Results:	The results showed that gypsum, as compared with the control, significantly decreased the mass loss in runoff of dissolved reactive P (DRP), total P (TP), soluble NH4–N, and total N by 85, 60, 80, and 59%, respectively. The concentration of these constituents was also significantly decreased by 83, 52, 79, and 50%, respectively. Nitrate N concentration in runoff was not decreased by gypsum. Gypsum also affected sediment and soil water–extractable P. The only significant effect of exchangeable Ca/Mg ratios was observed in the sediment water–extractable P, where Ca-treated soil decreased by 50% the concentration of P compared with Mg-treated soil. The results of this study demonstrated the potential of gypsum to decrease transport of total N and total P in runoff and the importance of Ca in the soil solution to decrease P solubility. Please click here for full article.

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