Aluminum Water Treatment Residual Effects on Soil Phosphorus Retention and Forage Yield and Nutritive Value
Author: Julie Lauter Driscoll
Publisher:
Published: 2008
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThe SPSC values increased on plots with WTR even after heavy loads of P were applied and some remained high enough that additional P should be retained. Potential nitrification rates increased with higher WTR application rates, indicating no adverse effects occurred on soil microbial populations because of WTR application. Groundwater SRP concentrations decreased with the addition of WTR by 78% in the surface applied treatments. There were no differences in SRP concentrations among the incorporated treatments which was likely a temporary result of the tilling process. Forage yield, crude protein and neutral detergent fiber were not affected by WTR application. Tissue Al did not increase and tissue calcium and magnesium uptake was not restricted. Tissue P decreased as WTR application rate increased. Tissue P levels were higher in the incorporated treatments than the surface applied treatments. However, tissue levels did not fall below the bahiagrass limiting value (0.15%). Based on this study, the use of WTRs is recommended as an amendment to soils with low P retention capacities that have been heavily impacted with P or will receive high amounts of P e.g., a dairy sprayfield.
