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... ..i Attachment 1 -� Dairy Waste Load Calculations 5. Calculatin nitrogen loading from fluid waste. lbs N/year AU (step 1� x lbs N/AU/day (table 1) x .80 x % N retention (table 2) x 365 = 130 , 816 AU_ (step 2) x lbs N/AU/day (table 1) x .60 x N retention (table 2) x 365 = 22 ,470 Subtotal 153 , 286 Subtract amount exported (if any) Total N available in fluid waste 153 , 286 6. Calculatinnitrogen loading from dry waste. lbs N/year AU (step 33 x lbs N/AU/day (table 1) x ..75 x % N retention (table 2) x 365 = AU (step 1) x lbs N/AU/day (table 1) x .20 x .75 x % N retention (table 2) x 365 = 24, 528 AU (step 2) x lbs N/AU/day (table 1) x .40 x .75 x 11 , 234 % N retention (table 2) x 365 = Subtotal 35 ,762 Subtract amount exported (if any) 35 , 762 Total N available in dry waste 0 7. Use this section only for dairies where all animals are in dry corrals or where alleys or freestalls are scraped. Typically 10% of the waste from the milk cows is carried in the wastewater. No. of Head AU Mi7k ,Cows x 1.0 Calculate nitrogen loading from fluid waste. AU (milk cows only) x lbs N/AU/day (table 1) x .1 x % N retention (Table 2) x -365 = Total N available in fluid waste Calculate nitrogen loading from dry waste _ lbs N/Year AU (milk cows only) x lbs N/AU/day (table 1) x .9 x .75 x % N retention (table 2): x 365 = TOTAL NITROGEN AVAILABLE 189 ,048 LESS : NITROGEN EXPORTED (DRY WASTE) 35 , 762 TOTAL NITROGEN AVAILABLE 153 , 286 TOTAL NITROGEN NEEDED ( PAGE 3 ) 166 , 230