Table 4 Pearson correlation coefficients between cumulative area-scaled N2O emissions in silage maize, total N (Nt) and mineralised N (Nmin) input to maize and soil parameters sampled in the DOK trial in 2012.

From: The impact of long-term organic farming on soil-derived greenhouse gas emissions

 

Including NOFERT

Excluding NOFERT

N2O

Nt input

Nmin input1

pH

SOC

N2O

Nt input

Nmin input1

pH

SOC

Nt input

0.18

    

0.55*

    

Nmin inputa

0.37

0.80***

   

0.63**

0.72**

   

pH

−0.54*

0.38

0.25

  

−0.63**

−0.57*

−0.33

  

SOC

−0.46*

0.18

−0.04

0.67**

 

−0.37

−0.36

−0.44

0.54*

 

Cmic

−0.50*

0.35

0.02

0.77***

0.88***

−0.49

−0.30

−0.52*

0.57*

0.86***

  1. Correlations were calculated across farming systems by including and excluding NOFERT.
  2. aNmin: nitrate and ammonium.
  3. SOC – soil organic carbon, Cmic – microbial biomass C.
  4. Significant levels for correlations: *p < 0.05, **p < 0.01, ***p < 0.001.
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