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5.   Ammonia volatilization during storage of cattle and pig
slurry: effect of surface cover.
Sommer, S. G.; Christensen, B. T.; Nielsen, N. E.; Schjorring, J.
K. 

J-Agric-Sci v.121, p.63-71. (1993).
Includes references.
Descriptor: cattle-slurry; pig-slurry; storage-; volatilization-;
wind-tunnels; air-pollution; ammonia-; denmark-
NAL Call No.: 10-J822
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6.   Ammonia volatilization from cattle and pig slurry during
storage and after application in the field.  Ammoniakfordampning
fra kvaeg- og svinegylle under lagring og efter udbringning pa
jorden.
Sommer, S. G. 

[Kobenhavn?] : Landbrugsministeriet, Statens planteavlsforsog,
1992. 417 p. : ill..
Cover title: Ammoniakfordampning fra kvaeg- og svinegylle under
lagring og efter udbringning pa jorden.
SB87.D4B47-nr.S2209
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7.   Ammonia volatilization from liquid hog manure: influence of
aeration and trapping systems.
O'Halloran, I. P. 

Soil-Sci-Soc-Am-j. [Madison, Wis.] Soil Science Society of
America. Sept/Oct 1993. v. 57 (5) p. 1300-1303. 
Includes references.
Descriptor: ammonia-; volatilization-; measurement-; pig-manure;
liquid-manures; laboratory-methods; sulfuric-acid; boric-acid;
efficacy-; aerobic- treatment
Abstract: Measurements of N loss from manures may reflect
differences in the types of manures and   methodologies used.
This study's objective  was to test the suitability of 0.32 M
H3BO3 and 0.9 M  H2SO4 for trapping NH3 volatilized from liquid
hog manure (LHM) under various  experimental   conditions.
Samples of LHM were incubated for 15 d in containers with
aeration outlets positioned   above, at the middle, or at  the
bottom of the LHM. Lowering the position of the aeration outlet  
increased both the pH of the LHM and the amount of NH3
volatilized.  More NH3 was trapped in H2SO4   than H3BO3, and the
difference in trapping efficiency of the two acids increased with
their NH3    concentrations. Neither the amount of NH3 trapped
nor the exponential relationship between the   NH4+
concentrations of two H3BO3 traps in  series was influenced by
changing the bubble path   length through the acid. Regression
analysis indicated that > 95% trapping efficiency was  obtained  
only when the NH3 concentration of H3BO3 was below 0.42 mg N
mL-1, much lower than the 0.9 mg N  mL-1 reported to be the 
limit for using H3BO3 in the Kjeldahl method. Even when using two
traps in   series, H3BO3 appeared to trap less NH3 than H2SO4. 
Amending LHM with sucrose lowered the pH of   H3BO3 used to trap
volatilized NH3, thereby interfering with NH3 determination and 
rendering H3BO3   unsuitable for determining NH3 volatilization.
Investigators who use H3BO3 to measure NH3,  volatilization in
other  systems must ensure that similar interferences do not
occur and that NH3.
NAL Call No.: 56.9-So3
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8.   Ammoniakfordampning fra svinegylle og opkoncentreret
biogasgylle : bestemt med en ny mikrometeorologisk
massebalance-metode =  Ammonia volatilization from pig slurry and
concentrated anaerobic fermented slurry ; measured by a new
micrometerological mass-balance  technique.  Ammonia
volatilization from pig slurry and concentrated anaerobic
fermented slurry ; measured by a new micrometeorological mass-
balance technique.
Sommer, S. G. 

[Kobenhavn?] : Landbrugsministeriet, Statens Planteavlsforsog,
1993. 27 p. : ill..
Summary in Danish and English.
SB87.D4B47--nr.S2252
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