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Nitrogen collection calculations: Dry Wet: Cattle in freestalls and flushed concrete lanes: Collected @ Corrals Flushed from Cow Lanes 20% 80% N/day Bulls @ 0 lbs. N/Day 0 lbs 0 lbs Lactating cows @ 0 lbs. N/Day 0 lbs 0 lbs Dry cowsand bred heifers @ 162 lbs. N/Day 32 lbs 130 lbs Heifers(1 year-breeding)@ 0 lbs. N/Day 0 lbs 0 lbs Calves-3 mos.to 1 yr. @ 0 lbs. N/Day 0 lbs 0 lbs Baby calves @ 0 lbs. N/Day 0 lbs 0 lbs Total Nitrogen collected per day: 32 Ibs per day,Dry 130 Ibs per day,Dry Dry: Wet: Cattle in corrals and flushed feed lanes: Collected @ Corrals Flushed from Cow Lanes 40% 60% Bulls @ 36 lbs. N/Day 14 lbs 22 lbs Lactating cows @ 0 lbs. N/Day 0 lbs 0 lbs Dry cowsand bred heifers @ 0 Ibs. N/Day 0 lbs 0 lbs Heifers(1 year-breeding)@ 0 lbs. N/Day 0 lbs 0 lbs Calves-3 mos.to 1 yr. @ 0 Ibs. N/Day 0 Ibs 0 lbs Baby calves @ 0 lbs. N/Day 0 Ibs 0 lbs Total Nitrogen collected per day: 14 Ibs per day,Dry 22 Ibs per day,Dry 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 20% x 151 30 lbs. per day Lbs of nitrogen reaching anaerobic lagoon 80% x 151 121 Ibs. per day Yearly nitrogen production: Total nitrogen in solids per year from corrals: 47 x 365 17,082 Ib/N/Year Total nitrogen in solids per year in aerobic settling pond: 30 x365 11,038 Ib/N/Year Total nitrogen in liquids at anaerobic lagoon: 121 x365 44,150 Ib/N/Year Nitrogen retention(losses)calculations from storage: Nitrogen retained from storage in dry lot corrals: 55-70% Use 55% 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: 17,082 x .55 9,395.10 Ib/N/Year N in solids from aerobic setting pond: 11,038 x .40 4,415 Ib/N/Year Total nitrogen in solids after losses: 13,810 Ib/N/Year Nitrogen in solids imported from main Dairy Facility: 54,493 Ib/N/Year Liquids: N in liquids from anaerobic lagoon after losses 44,150 x .25 11,037.60 Ib/N/Year Total nitrogen after losses available to crops from both solids and liquids: 79,341 Ib/N/Year Nitrogen requirements by the acres of farmed properties during the summer season and winter season all taking solids and liquids: Crop Acres N Requirement Corn silage(35T) 250 290 lbs.of nitrogen per crop 72,500 lbs. N Wheat silage- 250 175 lbs. of nitrogen per crop: 43,750 lbs. N Alfalfa- 0 480 lbs. of nitrogen per crop: - lbs. N Nitrogen required at these fields 116,250 lbs. N Appendix IA Mass Balance of Nitrogen Loading-Additional Properties