Aug 26 – 30, 2024
The Couvent des Jacobins
Europe/Paris timezone

Legume residue recovery and rhizodeposition: an underestimated source of soil nitrogen

Not scheduled
15m
Les Dortoirs (1st floor) (The Couvent des Jacobins)

Les Dortoirs (1st floor)

The Couvent des Jacobins

Rennes, France
Poster Synergies of technologies Poster session #1

Speaker

Ivo Voor (Estonian University of Life Sciences)

Description

In this study, we evaluated the impact of three nitrogen (N) balance calculation methods on N surplus in a five-crop rotation. A complex but precise N balance calculation method revealed a more realistic assessment of legume contribution in crop rotations, considering N surplus, cumulative surplus, and efficiency of N inputs. This method highlighted the significant role of red clover as a green manure on the N surplus of subsequent winter wheat crops in both conventional and organic cropping systems. Notably, an additional mineral fertilizer rate of 150 kg N ha-1 led to a complete transformation into N surplus, suggesting its use is unreasonable.
For crop rotation modeling, it’s recommended to use a N balance considering all N inputs and outputs. When factoring in crop residue return and rhizodeposition, the advanced N balance surplus increased by 201%, 187%, and 268% in the conventional N100, N150, and Organic systems, respectively, compared to the simplified N balance.

Keywords legumes; nitrogen balance; residues recovery; rhizodeposition

Primary author

Ivo Voor (Estonian University of Life Sciences)

Presentation materials