2. Development of BMP Cost-Effectiveness Values
Surface and Subsurface Losses from Land Application of Animal Wastes
The mass balance was unable to account for
Low value is for rainfall intensity of 5
high value is for 10 cm/ha.
The mass balance was unable to account for 41 percent of applied N and 24 percent of applied P.
Estimated, due to equipment failure.
The mass balance was unable to account for 64 percent of applied N and 35 percent of applied P.
all the studies, increased application rates (greater than the agronomic rate)
resulted in increased losses to surface runoff and subsurface drainage. However,
when losses are measured as a percent of total applied, the values tend to fall
within a fairly narrow range. For nitrogen, the range for combined losses is 12.4
percent to 17.3 percent. Based on these limited data, it is difficult to determine if