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Daily Manure Production Per Animal We have estimates of manure production –4.5 kg/day/hd for swine (liquid manure) –45-50 kg/day/hd for dairy cow (liquid)

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Presentation on theme: "Daily Manure Production Per Animal We have estimates of manure production –4.5 kg/day/hd for swine (liquid manure) –45-50 kg/day/hd for dairy cow (liquid)"— Presentation transcript:

1 Daily Manure Production Per Animal We have estimates of manure production –4.5 kg/day/hd for swine (liquid manure) –45-50 kg/day/hd for dairy cow (liquid) –25-30 kg/day/hd for beef cow (liquid) Solid portion ~ 13-15% of total

2 Animal Waste Nutrient Utilization Scenario Swine Confinement Facility kg / animal Nutrient Content in kg/ day / 1000 kg 0.52 kg N / day / 1000 kg animal wt kg P / day / 1000 kg animal wt kg K / day / 1000 kg animal wt.

3 Manure Characteristics In general… –Nitrogen (ammonia) is in urine –Phosphorus is in feces In the U.S. we’re working on ways to keep urine and feces separate

4 Manure Management Issues  Animal manure is a liability in high density livestock production areas where fertilizers are cheap  Animal manure is an asset if fertilizers are unavailable or expensive  Odor and ammonia emission to air-global warming  Odor issues are serious in residential areas  Pollution of soil and water resources-water quality  Hypoxia problems in international water

5 Nitrogen Is mobile in some forms (NO 3 ) –not in others (organic, NH 4 ) Does not carryover like P Is not determined by soil test

6 Negative Environmental Impacts Nitrogen - Nitrates leaching to tilelines and/or groundwater - Ammonia runoff into surface water causing fish kills

7 Negative Environmental Impacts Phosphorus Loss with soil erosion Eutrophication (algae growth) of surface waters

8 Phosphorus Is bound to the soil particles Remains in the soil year to year Moves if soil erodes Is determined by soil test Does not volatilize like nitrogen

9 Manure Nutrient Planning Determine the hectares needed to maximize nutrient use and minimize negative environmental impacts

10 Question 1 Which Nutrient should I use for planning... Nitrogen? Phosphorus?

11 U.S. Manure Law says... Use nitrogen for nutrient planning - Results in least land area needed - May not be best use of nutrients because phosphorus is overapplied - Laws in U.S. are changing to require P planning

12 N:P Ratio of Manure N:P ratio is different for different types of manure N:P Cattle ratio… ~ 2:1 Swine ratio… ~ 1.5:1 Poultry ratio… ~ 1:2

13 Phosphorus Planning Requires more hectares Results in lower application rates Maximize economic value of manure Depends on crop & manure application frequency Requires additional commercial N fertilizer


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