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Nitrogen collection calculations: Dry: Wet: Cattle in freestalls and flushed concrete lanes: Collected(aJ Flushed From Corrals: 20% Cow Lanes: 80% Lactating cows 879.2 lbs N per day 175.84 lbs 703.36 lbs Dry cows 69.3 lbs N per day 13.86 lbs 55.44 lbs Bred heifers A,0 lbs N per day 0 lbs — 0 lbs Calves-3 mos. to 1 yr. #0 lbs N per day 0 lbs — 0 lbs Baby calves (dil 0 lbs N per day 0 lbs 0 lbs Total Nitrogen collected per day: 189.7 lbs per day,Dry 758.8 lbs per day, Wet •Nitrogen flushed from concrete cow lanes will flow through settling ponds. Settling ponds typically collect 80%of the solids prior to reaching the lagoon. Settling ponds retain approximately 20%of the nitrogen prior to reaching the lagoon. Lbs of flushed nitrogen collected in settling pond 758.8 x .20= 151.76 lbs. per day Lbs of nitrogen reaching anaerobic lagoon 758.8 x .80= 607.04 lbs. per day Yearly nitrogen production: Total nitrogen in solids per year from corrals: 189.7 x 365= 69,240 tbs. N per year Total nitrogen in solids per year in aerobic settling pond: 151.76 x 365 = 55,392lbs. N per year Total nitrogen in liquids at anaerobic lagoon: 607.04 x 365 = 221,569 lbs. N per year Nitrogen retention (losses)calculations from storage: Nitrogen retained from storage in dry lot corrals: 55-70% Use 60% Nitrogen retained from storage in aerobic settling pond 35-45% Use 40% Nitrogen retained from storage in anaerobic lagoons: 20-35% Use 25% Lbs of nitrogen per year available after losses in storage: Solids: N in solids from corrals: 69,240 x.60= 41,544 lbs. N in solids from aerobic setting pond: 55,392 x.40= 22,156 lbs. Total nitrogen in solids: 63,700 lbs. Liquids: N in liquids from anaerobic lagoon 221,569 x.25= 55,392 lbs. Total nitrogen before losses available to crops from both solids and liquids: 119,092 Ibs. Nitrogen requirements by 120 acres of farmed properties during the summer season and 120 acres during the winter season: Rotating crops at 120 summer/ 120 winter acres,all taking solids and liquids: Corn silage(351)-290 lbs. of nitrogen per crop: x 120 acres= 34,800 tbs. N Wheat silage- 175 lbs. of nitrogen per crop: x 120 acres= 21,000 lbs. N Nitrogen required at these fields : 55,800 lbs. N ®Western Design/David Avila 2000 20