N2O emissions from a loamy soil cropped with winter wheat as affected by N-fertilizer amount and nitrification inhibitor · Knowledge Library

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N2O emissions from a loamy soil cropped with winter wheat as affected by N-fertilizer amount and nitrification inhibitor · Knowledge Library

N2O flux rates

↑ 2↓ 13

increase
N3 vs. N1significant · 2011-2013 · Heidfeldhof · N3 (230/240) versus N1 (120 kg N/ha); both inhibitor strata; matched Table1 LSM pairs .05, not factor omnibus test.
Numbers
- treatment 29.2 vs. control 18.2 µg N2O-N m-2 h-1 (+60.44 %) · -NI; N3 a vs N1 cd
- treatment 20.2 vs. control 14.9 µg N2O-N m-2 h-1 (+35.57 %) · +NI; N3 c vs N1 e
Source · p. 15
“N2 O fluxes increased with increasing N fertilizer rates (Table 1).”
decrease
+NI (ENTEC26, ASN plus DMPP) vs. -NI (ASN without DMPP)significant · 2011-2013 · Heidfeldhof · DMPP with ASN vs same ASN without DMPP; matched N1,N2,N3 comparisons in Table1, all .05. No pooled flux mean invented.
Numbers
- treatment 14.9 vs. control 18.2 µg N2O-N m-2 h-1 (-18.13 %) · N1,e versus cd
- treatment 16.6 vs. control 24.1 µg N2O-N m-2 h-1 (-31.12 %) · N2,de versus b
- treatment 20.2 vs. control 29.2 µg N2O-N m-2 h-1 (-30.82 %) · N3,c versus a
Source · p. 15
“N2 O fluxes were significantly reduced by DMPP (Table 1)”
increase
N-fertilized treatments, pooled N1-N3 vs. N0significant · 2011-2013 · Heidfeldhof · Explicit pooled fertilized-versus-N0 contrast, averaged over N1-N3 and both inhibitor strata. Vegetation and winter seasons in both years only: Table1 p<.001 for first-year vegetation/winter and second-year vegetation, p=.044 for second-year winter; common .05 bound. Tillage contrasts excluded; individual-rate significance is not inferred.
Numbers
- treatment 31.5 vs. control 14.3 µg N2O-N m-2 h-1 (+120.3 %) · year1 vegetation · Pooled fertilized/N0; pair p<.001
- treatment 14.1 vs. control 9.5 µg N2O-N m-2 h-1 (+48.42 %) · year1 winter · Pooled fertilized/N0; pair p<.001
- treatment 18.6 vs. control 6 µg N2O-N m-2 h-1 (+210 %) · year2 vegetation · Pooled fertilized/N0; pair p<.001
- treatment 14.7 vs. control 11.3 µg N2O-N m-2 h-1 (+30.09 %) · year2 winter · Pooled fertilized/N0; pair p=.044
Source · p. 12
“N fertilization significantly increased N2 O emissions (Tables 1 and 3).”
Source · p. 10
“2 p values of difference between fertilization treatments within year and season.”

Sites

Heidfeldhof

Location: Heidfeldhof, South of Stuttgart, Southern Germany48.72° N, 9.20° E
Climate: 10.2 °C mean annual temperature628 mm annual precipitation
Soil: Luvisol (Haplic) · WRB
Land use: soil cropped with winter wheatArable land
Management on the whole site: winter wheatWheat/Triticum aestivum

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
0–30 cm	silt dominated	26 %	6.7	1.19 %	1.25 g cm-3 (assumed for WFPS calculation; not measured)