Figure 2. Fluxes of greenhouse gas from zero tilled and tilled soil.

(a) CO₂ expressed in mg CO₂-C m⁻² h⁻¹, (b) CH₄ expressed in mg CH₄-C m⁻² h⁻¹, (c) N₂O expressed in mg N₂O-N m⁻² h⁻¹, (d) CO₂ expressed in ng CO₂-C g⁻¹ h⁻¹, (e) CH₄ expressed in ng CH₄-C g⁻¹ h⁻¹ and (f) N₂O expressed in ng N₂O-N g⁻¹ h⁻ (average values for different sites and standard error of the mean are shown, n = 33).