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Impact of Soil Amendments on Reducing Phosphorus Losses from Runoff in Sod

^a USDA-ARS National Soil Dynamics Laboratory, 411 South Donahue Drive, Auburn, AL 36832-5806
^b USDA-ARS Soil Drainage Research, 590 Woody Hayes Drive, Columbus, OH 43210
^c USDA-ARS Grassland Soil and Research Laboratory, 808 East Blackland Road, Temple, TX 76502

View larger version (36K): [in a new window]   Fig. 1. Regression relationships of composted dairy manure application rate to concentration of dissolved molybdate reactive phosphorus filtered through a 0.45-µm membrane [RP(<0.45)] in runoff as affected by chemical amendments gypsum, lime, and ferrous sulfate measured at 10-, 20-, 30-, and 40-min sampling times and in the tank after the runoff event.

View larger version (27K): [in a new window]   Fig. 2. Regression relationships of the concentration of dissolved molybdate reactive phosphorus filtered through a 0.45-µm membrane [RP(<0.45)] in runoff for the second runoff event over sampling time as affected by composted dairy manure rate for the chemical amendments gypsum, lime, and ferrous sulfate.