Table 3 Silage maize yields and yield-scaled N2O emissions (mean ± SE).

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

 

Silage maize DMa yields

Yield-scaled N2O emissions

Mg DM ha−1

% of CONFYM

g N2O-N Mg DM−1

Farming system effect

BIODYN

13.57 ± 0.70b

73

154.8 ± 31.0b

BIOORG

13.21 ± 0.23b

71

269.0 ± 17.5ab

CONFYM

18.62 ± 1.22a

100

259.1 ± 32.7ab

CONMIN

18.00 ± 0.77a

97

238.3 ± 52.5ab

NOFERT

8.65 ± 0.35c

47

478.8 ± 113.9a

ANCOVA

F-value

p-value

 

F-value

p-value

(Intercept)

10577.4

<0.0001

 

3489.5

<0.0001

Clay content

7.06

0.022

 

0.21

0.652

Farming System

33.53

<0.0001

 

3.94

0.031

Contrasts

t-value

p-value

 

t-value

p-value

org vs. non-org

−7.17

<0.0001

 

−0.59

0.550

  1. aDry matter (DM) 80%
  2. ANCOVA per farming system (n = 4). Letters = Post-hoc Tukey test (p < 0.05).
  3. Contrasts: Post-hoc t-test on pairwise comparisons of org (BIODYN + BIOORG) and non-org (CONFYM + CONMIN) systems (n = 8).
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