For gas collection, boxes were kept over the crop rows for 2 h during the daytime (10.00–12.00 h). No measurementwas carried out in between rows. Estimates of seasonal cumulative gaseous N (N2O+N2), mN2O and CO2 productions were calculated from averaging their rates throughout the period by weighting the interval of two measurements m(Cai et al. 1997).
Carbon_content
0.38
Mean_annual_temp. (longterm average)
Max:June 26.5;Min:Jan 6.6
Location
Ludhiana
N2O unit in the paper
kg N/ha
year
2001
Soil type_publication
Typic Ustochrept
pH
7.9
Length of deployment
None
N2O_loss_I as value
0.04583
Climate (Publ)
None
Tillage comparisons
False
CEC
None
No of points used to calculate flux
None
DM crop yield
5.6
sand
78.0
Remarks N2O
The experimental treatments included ten combinations for wetland rice with two levels of WR (0 and 6 t residue ha–1 on dry weight basis) without or with 120 kg FN ha–1, and sesbania Greem Manure (GM: 0, 20 and 40 t fresh biomass ha–1). A recommended rate of 120 kg FN ha–1 (as urea) was applied in three splits at about 0, 3 and 6 weeks after transplanting rice seedlings, to synchronize N supply with crop demand. The crop was irrigated daily during the 1st month and thereafter at intervals so as not to allow a dry spell.
Country_ISO-3166
IN
min. N form comparison
False
Field type
rf
Publication No.
10.1007/s003740100420
pre-crop
wheat
Chamber size
None
Variation type
None
silt
11.0
Cumulative N2O
12.4
Country
India
clay
11.0
pH [method used]
1:2 soil-to-solution ratio
Month of year
4-10
Mode_of_application
incorp
Bulk_density
None
year exp.
1996
Drainage
None
N rate / N response
False
N_rate
120.0
N2O in the paper
12.4
CO2-value
0.778
Remarks on the experiment (general)
None
Method_N2O
Acetylene inhibition-intact soil core technique for direct measurement of denitrification losses, N2O and CO2 production. A pair of undisturbed intact soil cores (5-cm diameter × 15-cm long) from each
of three replications of selected treatments was taken by driving steel cylinders into the soil with a hand-operated slide hammer every week or at shorter/longer intervals depending upon field operations. Each core was then immediately removed and enclosed in a plastic bag.
