title: Emissions of ammonia, nitrous oxide, methane, and carbon dioxide during storage of dairy cow manure as affected by dietary forage-to-concentrate ratio and crust formation.
abstract: Sixteen 200-L barrels were used to determine the effects of dietary forage-to-concentrate (F:C) ratio on the rate of NH(3)-N, N(2)O, CH(4), and CO(2) emissions from dairy manure during a 77-d storage period. Manure was obtained from a companion study where cows were assigned to total mixed rations that included the following F:C ratio: 47:53, 54:46, 61:39, and 68:32 (diet dry matter basis) and housed in air-flow-controlled chambers constructed in a modified tiestall barn. On d 0 of this study, deposited manure and bedding from each emission chamber was thoroughly mixed, diluted with water (1.9 to 1 manure-to-water ratio) and loaded in barrels. In addition, on d 0, 7, 14, 28, 35, 49, 56, 63, 70, and 77 of storage, the rate of NH(3)-N, N(2)O, CH(4), and CO(2) emissions from each barrel were measured with a dynamic chamber and gas concentration measured with a photo-acoustic multi-gas monitor. Data were analyzed as a randomized complete block with 4 replications. Dietary F:C ratio had no effect on manure dry matter, total N and total ammoniacal-N (NH(3)-N + NH(4)(+)-N), or pH at the time of storage (mean ± SD: 10.6±0.6%, 3.0±0.2%, 93.1±18.1 mg/dL, and 7.8±0.5, respectively). No treatment differences were observed in the overall rate of manure NH(3)-N, N(2)O, CH(4), and CO(2) emissions (mean ± SD over the 77-d storage period; 117±25, 30±7, 299±62, and 15,396±753 mg/hr per m(2), respectively). The presence of straw bedding in manure promoted the formation of a surface crust that became air dried after about 1 mo of storage, and was associated with an altered pattern in NH(3)-N and N(2)O emissions in particular. Whereas NH(3)-N emission rate was highest on d 0 and gradually decreased until reaching negligible levels on d 35, N(2)O emission rate was almost zero the first 2 wk of storage, increased sharply to peak on d 35, and decreased subsequently. The emission rate of CH(4) and CO(2) peaked simultaneously on d 7, but decreased subsequently until the end of the storage period. In this study, C:N ratio of gaseous losses was 32:1, reflecting higher volatile C loss than volatile N loss during storage. On a CO(2)-equivalent basis, the most important source of non-CO(2) greenhouse gas emitted was CH(4) until formation of an air-dried crust, but N(2)O thereafter. Taken together, these results suggested that the formation of an air-dried crust resulting from the straw bedding present in the manure reduced drastically NH(3)-N, and CH(4) emissions, but was conducive of N(2)O production and emission.
authors.affiliation: Department of Dairy Science, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Aguerre
authors.forename: M A
authors.initials: MA
authors.lastname: Wattiaux
authors.forename: J M
authors.initials: JM
authors.lastname: Powell
mesh_terms: D000641:Ammonia / Q000032:analysis*; D000818:Animals; D002245:Carbon Dioxide / Q000032:analysis*; D002417:Cattle; D003612:Dairying / Q000379:methods* / Q000706:statistics & numerical data; D004032:Diet / Q000662:veterinary*; D005260:Female; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*
chemical_list: D008372:Manure; D002245:Carbon Dioxide; D000641:Ammonia; D009609:Nitrous Oxide; D008697:Methane