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MANURE HANDLING AND STORAGE TO MINIMIZE N LOADING OF THE ENVIRONMENT

MANURE HANDLING AND STORAGE TO MINIMIZE N LOADING OF THE ENVIRONMENT. Reason to store manure Preserve and contain manure nutrients until it can be spread onto the land at a time compatible with climate and cropping system Goals Maintain excreted N in non-volatile organic forms

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MANURE HANDLING AND STORAGE TO MINIMIZE N LOADING OF THE ENVIRONMENT

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  1. MANURE HANDLING AND STORAGE TO MINIMIZE N LOADING OF THE ENVIRONMENT • Reason to store manure • Preserve and contain manure nutrients until it can be spread onto the land at a time compatible with climate and cropping system • Goals • Maintain excreted N in non-volatile organic forms • Undigested protein • Microbial N • Urea • Minimize volatilization of NH3 • If N is volatilized, it should be in the form of N2 • Prevent losses of N into surface and ground water sources • Provide adequate storage until it can be safely spread

  2. N TRANSFORMATIONS IN LIVESTOCK PRODUCTION AND MANURE STORAGE FACILITIES Manure N Anerobic microbial C skeletons H2S degradation (slow) VOCs Fecal N (20-40% of N) Microbial N NH4+ Slow Urine N aerobic Anerobic (60-80% of N) Microbial NH3 NO2 N2 O urease (rapid) pH (volatile) H2N C NH2 + H+ + H2O 2NH4+ 2HCO3- • In poultry • Urinary N is secreted as uric acid with the feces

  3. NH3 volatilization increased by: • Increasing rumen pH • Increased by increased HCO3 and NH3 • Increasing moisture • Increasing temperature • From outside of confinement buildings • Greater ventilation • Concentrations of NH3 greater inside confinement buildings in cold weather • From outside lots • Greater surface area

  4. METHODS TO LIMIT AMMONIA VOLATILIZATION FROM MANURE • Dietary approaches • Reduce N excretion • Feed acidic Ca and P sources to decrease manure pH • Examples • Calcium chloride • Phosphoric acid • Limitations • Unpalatable • May cause ulcers in mouth • Feed Yucca extract • May inhibit microbial urease

  5. Technological approaches • Frequent removal of manure from facilities • Ne feedlot • One-time cleaning, 68% N loss by volatilization • Monthly cleaning, 55.5% N loss by volatilization • Increase carbon in manure • Increases C:N ratio to increase microbial growth • Approaches • Feed more fiber • Use more bedding • Separate liquid and solids • Separates urea in urine from urease in feces • Methods • Gravity (Inclined floors, sedimentation pits) • Mechanical (Screens, centrifuges, presses) • Separated solids • Land applied • Composted • Liquids • Need further processing • Urease inhibitors • N-(n-butyl) thiophosphoric triamide (NBPT) • Must be applied weekly to feedlot surface • Currently not cost effective

  6. COMMON MANURE STORAGE • Solid • Systems • Poultry • Litter • Swine and Dairy • Separated solids • Bedded manure • Beef • Scraped • Facilities • Concrete pad with sides • Settling basins • Advantages • Low volume • Low odor • Moderate nutrient retention • Disadvantages • More labor • Must prevent precipitation run-off

  7. BEEF FEEDLOT WITH SETTLING BASIN

  8. Composting • Treatment to stabilize N • Requirements • Appropriate C:N ratio C:N Optimum >30:1 Manures Dairy cow 10:1 Beef cow 10:1 Beef feedlot 13:1 Swine 7-8:1 Poultry 7-9:1 Horse 19:1 • Temperature • 140o F • Requires frequent turning • Moisture level • 40-60% • Adequate porosity • Particles should be > 1 inch • Straw a better source than paper • pH • 5.5 – 7.5

  9. Slurry • For livestock and poultry confinements • Facilities • Pit under slatted floor • Needs access ports for pumping and agitation at 40 foot intervals • Ventilation is necessary • Manure is either applied directly or after storage • Fabricated storage tank • Manure is either scraped or pumped into structure • Easily covered • Earthen basin • Provides a large volume at low cost • Soil materials must seal basin • Vegetation must be maintained on berms • Advantages • Less volume than liquid storage • Possible to cover to reduce volatilization • High nutrient retention, if covered • Disadvantages • Higher odor than solids • Toxic gases • H2S

  10. SLURRY SYSTEMS

  11. Covers to limit NH3 and odor release

  12. Liquid systems • Anerobic lagoons • Most common liquid system • Usually treats liquid fraction separated from solids • Requires warm temperatures for microbial activity • Advantages • Large storage volume • Can use conventional pumping equipment • Disadvantages • Very high NH3 volatilization • Requires appropriate soil materials to seal lagoon • Requires solids separation • Manure additions must be slow and uniform • High odor in spring when microbial activity increases under Midwest conditions • Requires periodic sludge removal

  13. Alternate treatments to limit NH3 loss from liquid systems • Aeration • Converts NH3 to NO3 • Requirements • Second lagoon with aerator Surface pump Compressed air Aerobic biofilters • One lagoon with 2 compartments Aerobic top and Anerobic bottom • Disadvantages • Expense • Limited effectiveness • Production of NOx gases • Methane production • Enclosed anerobic fermentation • Can supply energy for farm or for sale • Requires additional structure for storage of effluent • Good N retention if additional storage is covered • Expense

  14. Constructed wetlands • For processing liquid fraction after solids separation • N trapped in plants growing in or on wetland • Types • Surface Most common • Subsurface Water treatment in a gravel bed Works better in winter than surface wetland May plug • Reciprocating Recurrently fill and empty Causes aerobic and anerobic zones

  15. N LOSSES FROM DIFFERENT MANURE HANDLING AND STORAGE SYSTEMS N loss, %N retention, % Daily scrape and haul from barn 20-35 65-80 Open lot 40-70 30-60 Pile (Cattle/Swine) 10-40 60-90 Pile (Poultry) 5-15 85-95 Compost 20- 50 50-80 Deep pit (Poultry) 25-50 50-75 Litter 25-50 50-75 Pit under floor (Swine) 15-30 70-85 Tank above ground top loaded 20-35 65-80 Tank above ground bottom loaded 5-10 90-95 Tank above ground with cover 2-30 70-98 Holding basin 20-40 60-80 Anerobic lagoon w/ no cover 70-80 15-30 Constructed wetlands 15 85

  16. FACTORS AFFECTING SIZE OF MANURE STORAGE • Volume of manure and wastewater produced • Include wash water, run-off from open lots and feed storage, and water for flushing • Limitations for spreading • Amounts of land available for spreading • Crop nutrient requirements • Length of storage period • Climatic limitations • Length of application windows • Needs • A minimum of 6 months storage • Equipment capabilities • Discharge regulations • All beef and dairy CAFOs • No discharge except for a 25-year, 24-hour storm • All new or renewed swine, poultry, and veal CAFOs • No discharge except for a 100-year, 24-hour storm

  17. MANURE APPLICATION TO MINIMIZE N LOADING • Considerations • Manure N concentration • Needs laboratory analysis to adjust for factors like diet, volatilization, water dilution, and bedding • If developing a CNMP, need to consider total N production Manure N (lb N/lb animal wt/yr) Swine Nursery .22 Growing .15 Finishing .15 Sows and litter .17 Sow gestation .07 Gilts .088 Boars .055 Beef 450-750 lb .11 High energy finish .11 Cows .12 Dairy 50 lb milk/d .18 70 lb milk/d .22 100 lb milk/d .27 Dry .11 Heifer .11 Layers .30 Broilers .40 Turkeys .27

  18. Availability of N to plants (PAN) • PAN = Organic N x mineralization rate + NH4-N x volatilization factor + NO3-N • Mineralization rate of organic N • Generally slow • Increases with: • Lower soil moisture • Increased soil temperature • Increased soil pH • Nutrients for soil microbes • Average rates Soil moisture% OM-N available < 18% 35 > 18% 25

  19. Volatilization of NH3 • Very rapid with surface application • Rate dependent on: • Application method Lower with injection or incorporation • Temperature Greater from surface applied at higher temperature • Plant uptake Losses lower when plants actively growing • Average factors Application method% NH4-N available Injected or side-dressed during growing 100 season Injected or incorporated in spring 65 (Reduce by 12% for each day delay in incorporation) All other conditions 0

  20. Plant Available Nitrogen (PAN) • After storage loss Storage typeProportion of manure N available after storage Feedlot .60 Manure pack under roof .70 Bedded swine .50 Liquid/slurry, covered .90 Liquid/slurry, uncovered .75 Storage pit under slats .85 Poultry manure on shavings .70 Compost .70 Anerobic lagoon .20

  21. After application ___________Application method______________ Soil incorporationBroadcastIrrigation Proportion of manure N available after application Scraped manure Livestock .6 .5 - Poultry litter .6 .5 - Liquid slurry Dairy or Beef .7 .5 .4 Swine .7 .4 .3 Layers .7 .5 .4 Anerobic lagoon Dairy or Beef .8 .5 .5 Swine .9 .5 .5 Layer .9 .5 .5 • Total PAN = Total N x ( PAN after storage x PAN after application) • Examples • PAN of Feedlot manure applied with incorporation • PAN = Total N produced x (.6 x .6) = Total N produced x .36 • PAN of Swine pit manure applied with incorporation • PAN = Total N produced x (.85 x .7) = Total N produced x .595 • PAN of Anerobic lagoon manure applied with irrigation • PAN = Total N produced x (.2 x .5) = Total N produced x .10

  22. Other N sources • N-fixation by legume plants • Supplies enough N to meet legume plant needs for growing year • N-fixed by legume plants for following year lb plant available N/acre/year Soybeans 30-45 Alfalfa 50-125 • N fertilizer • Rates should be calculated as the difference between plant N needs and PAN from manure and legumes • Crop N needs • Nutrients should be applied to achieve Realistic Yield Expectations of the crop • The ‘Agronomic rate’ • Realistic yield expectations • Factors • Soil fertility • Soil management • Climate • Plant populations • Pest control • Variety • Grazing (60-75% of PAN reqt. for hay) • Estimates • Average of 3 highest years of last 5 • Can use county soil survey

  23. Plant N requirement for yield N removal in Efficiency of harvested crop, N use, N required Crop wet basis__%__for crop Corn Grain .81 lb/bu 83 .97 lb/bu Stover (Baled) 17.80 lb/ton 100 17.80 lb/ton Soybeans Grain 3.54 lb/bu 166 2.13 lb/bu Stover (Baled) 13.60 lb/ton 100 13.60 lb/ton Alfalfa (Baled) 46.10 lb/ton 200 23.05 lb/ton Bromegrass (Baled) 39.20 lb/ton 100 39.20 lb/ton Reed canarygrass (Baled) 28.00 lb/ton 100 28.00 lb/ton Switchgrass (Baled) 21.80 lb/ton 100 21.80 lb/ton Alfalfa haylage 25.90 lb/ton 200 12.95 lb/ton Corn silage 9.00 lb/ton 100 9.00 lb/ton

  24. Calculating manure application rate based on N • Plant available N = Realistic yield expectation x Crop N reqt. needs • Manure application = Plant available N reqt / PAN conc in manure rate Example: Say: Corn yield = 180 bu/acre PAN needed, lb/acre = 180 bu/acre x .97 lb N/bu = 174.6 lb PAN/acre Say: Swine lagoon manure containing 50 lb PAN/1000 gal which will be injected Manure applied, gal/ac = 174.6 lb PAN/ac / 50 lb N/1000 gal = 3,492 gal/ac

  25. USING CROPS TO ‘MINE’ MANURE N • Some CAFOs look at harvested crop as method to remove manure N from operation • Potential amounts of N removed CropRYEN removed/unitlb total N removed/acre Corn grain 180 bu .81 lb/bu 146 Corn stover (Baled) 4 ton 17.80 lb/ton 71 Soybeans 55 bu 3.54 lb/bu 195 Alfalfa (Baled) 5 ton 46.10 lb/ton 230 Bromegrass (Baled) 4 ton 39.20 lb/ton 156 Reed canarygrass 5 ton 28.00 lb/ton 140 (Baled) Corn silage 20 ton 9.00 lb/ton 180 • Considerations • To mine N, crop must either be sold or used in the diet to reduce purchase of protein supplements on farm • Grazing is effective at recycling N • Therefore, grazing is ineffective for mining nutrients • If N is applied at the agronomic rate, Phosphorus will accumulate • N rate is 2 to 3 times greater than the P rate

  26. CONSIDERATIONS IN MANURE APPLICATION • Application rate • Method Surface applicationInjection or incorporation Greater N volatilization Less N volatilization Greater potential for N loss in run-off Less run-off potential Nutrients further from crop roots Nutrients near roots • Site • In Iowa, manure application can not occur within 200 feet of a surface water source if no vegetative buffer • In Iowa, manure application may occur up to 50 ft if vegetative buffer and manure is incorporated • Timing • Manure should be applied shortly before nutrients will be used for growth • 30 days

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