Nitrous oxide from aerated dairy manure slurries: Effects of aeration rates and oxic/anoxic phasing.
Small-scale laboratory research was conducted to compare the effects of different aeration rates and oxic/anoxic phasing on nitrous oxide (N(2)O) formation from dairy manure slurries. Manure slurry samples were incubated in triplicate for three-weeks under a range of continuous sweep gas flows (0.01-0.23L min(-1)kg(-1) slurry) with and without oxygen (air and dinitrogen gas). The net release of N(2)O-N was affected by both aeration rates and oxic/anoxic conditions, whereas ammonia volatilization depended mainly on gas flow rates. Maximum N(2)O-N losses after three-weeks incubation were 4.2% of total slurry N. Major N losses (up to 50% of total slurry N) were caused by ammonia volatilization that increased with increasing gas flow rates. The lowest nitrous oxide and ammonia production was observed from low flow phased oxic/anoxic treatment.
Molodovskaya
Marina
M
Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA.
Singurindy
Olga
O
Richards
Brian K
BK
Steenhuis
Tammo S
TS
D000388:Air; D000641:Ammonia / Q000032:analysis; D000818:Animals; D002417:Cattle; D003612:Dairying; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D009609:Nitrous Oxide / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D014835:Volatilization
D008372:Manure; D009566:Nitrates; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D000641:Ammonia; D009609:Nitrous Oxide; D010100:Oxygen