Short-term nitrous oxide emission after turning of composting
Viguria, M.1*, López, D.M.1, Alberdi, O.1, Arriaga, H.1, Merino, P.1
1NEIKER-Tecnalia, Environment Quality Department, 48160, Derio (Bizkaia), ES
*Corresponding author: email@example.com
10th April to 24th April 2012 in the North of Spain.
Turning: 13th April 2012.
MATERIAL & METHODS
Table 1. N2O measurement characteristics.
Acknowledgment. This work was cofinanced by the Ministry of Science and
Innovation (INIA. RTA 2011-00107-C02-01)
Objective: to asses the effect of turning on N2O
emission during on-farm composting of beef and
dairy cattle manure.
Frequency 1st week: daily.
2nd - 3rd week: once/week.
Methodology 4 closed chambers/pile.
3.8 l volume, 314 cm2 area.
Sampling 0, 20, 50 min after chamber closure.
Collected in 9 ml gas vial.
Concentration Gas chromatography (GC-7890A, Agilent).
Emission Slope of the linear regression (R2>0.90)
between concentration and time.
Figure 1. (a) Beef and dairy cattle manure heaped since December
2011 (Bd and Dd, respectively) and dairy cattle manure heaped
since March 2012 (Dm).; (b) Gas sampling by closed chamber.
Manure (15 cm depth) and air temperature recorded
by 2 thermocouples/pile (TCdirect) and a datalogger
(HOBO U12-13), respectively.
Unaltered manure sampled 1 hour before and after
turning for density analysis.
Statistical analysis: repeated measurements of N2O
emission during 8 measuring days (SPSS 15.0).
Figure 2. N2O emission and temperature (ºC) during the study.
Turning was carried out on day pointed by an arrow.
Bd Dd Dm
turning (g l-1)
768 (122) 918 (91) 812 (57)
turning (g l-1)
767 (49) 914 (109) 504 (100)
(mg m-2 d-1)
0.0 21.4 (29.2) 80.8 (86.2)
(8 days) (mg m-2)
8.7 52.4 157.7
Table 2. Density and N2O emission for Bd, Dd and Dm manure.
Mean (standard deviation).
Density in Dm decreased 38% after turning (p<0.05).
Nitrous oxide emission from dairy cattle manure
decreased to background levels 2 days after turning.
Turning induced N2O emission in dairy cattle manure.
Higher maturity of manure heap could lead to lower N2O
emission after turning.