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Manure collection calculations: Cattle in freestalIs and flushed concrete lanes: Corrals: 20% Flushed: 80% Lactating cows-627.2 lbs total 125.44 lbs 501.76 lbs Cattle in corrals and flushed lanes: Corrals:40% Flushed: 60% All other cattle-439.2 lbs total 175.68 lbs 263.52 lbs Total Nitrogen collected from areas: 301.12 lbs 765.28 lbs Nitrogen flushed from concrete 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 765.28 x.20= 153.5 lbs. Lbs of nitrogen reaching anerobic lagoon 765.28 x .80= 612.2 lbs. Total nitrogen in solids per year from corrals: 301.12 x 365 = 109,908 lbs. Total nitrogen in solids per year in aerobic settling pond: 153.5 x 365 = 56,027 lbs. Total nitrogen in liquids at anerobic lagoon: 612.2 x 365 = 223,453 lbs. Nitrogen retention 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 anerobic lagoons: 20-35% Use 25% Lbs of nitrogen per year available after losses in storage: N in solids from corrals: 109,908 x .60= 65,945 lbs. N in solids from aerobic setting pond: 56,027 x .40= 22,411 lbs. N in liquids from anerobic lagoon 223,453 x .25 = 55,863 lbs. Nitrogen requirements by 228.3 acres of farmed properties: Rotating crops: Corn silage- 250 lbs. of nitrogen per crop: x 228.3 acres= 57,075 lbs. Wheat silage- 175 lbs. of nitrogen per crop: x 228.3 acres= 39,952 lbs. Total nitrogen required from cropping: 97,027 lbs. Site nitrogen balance: Total nitrogen required from crops: 97,027 lbs. Nitrogen available from liquids: 55,863 tbs. Nitrogen still required after application of liquid nitrogen: 41,164 lbs. Total nitrogen available from solids: 78,274 lbs. Balance of nitrogen in solids after applying solids onto crop fields to balance crop requirements: 78,274-41,164 lbs. = 37,110 lbs. Nitrogen Loading Conclusion: • The current farming operation is adequate to consume the nitrogen that will be produced by the proposed dairy expansion. • The nitrogen balancing calculations indicate that a portion of the solids will be required to be removed from the site,not to be applied to the farming property used in the calculations. • The current liquids/solids application rates are favorable to the agronomical management of the soil because of the soil requiring organic materials to increase tilth,water intake rate, water retention capabilities and nitrate retention capability. • If more farming property is incorporated into the operation that can receive liquids,more of the solids can be used on site or more cattle can be housed at the site. 10