Diversifying crop rotations with temporary grasslands - Université de ...

Fig. 2: Mean biomass (harvestable dry matter, cut at 5 cm above soil surface) of 12 weed
species and lucerne cut at 8 consecutive dates for 4 treatments: A) Reference with no early
cutting and low competition. B) No early cutting as A, but with higher competition (presence
of lucerne). C) Low competition as A, but with an additional early cutting (25 March 2008). D)
Combining high competition and early cutting treatments. See Table I for species codes.
Grey bars indicate the biomass of other minor dicotyledonous weed species.
Fig. 2: Biomasse moyenne de 12 espèces adventices + luzerne coupé à 8 dates
consécutives pour 4 conditions expérimentales.
Total dry matter (g/tray)
200
150
100
50
0
200
150
100
50
0
No early cutting
A) Reference B)
25/03/08
16/04/08
09/05/08
06/06/08
03/07/08
01/08/08
08/09/08
16/12/08
01/03/08
C- C+
C) F- D)
25/03/08
16/04/08
09/05/08
06/06/08
03/07/08
01/08/08
08/09/08
16/12/08
01/03/08
No early cutting
25/03/08
25/03/08
Cutting date
124
16/04/08
16/04/08
09/05/08
09/05/08
06/06/08
06/06/08
03/07/08
03/07/08
01/08/08
01/08/08
08/09/08
08/09/08
16/12/08
16/12/08
Species
Lucerne
BROST
ALOMY
STEME
GALAP
AMBEL
GERDI
VERPE
6 Dicots
When looking at the cumulative biomass production per plant up to the first common
cutting treatment, the reference plants (no early cutting, low competition) of each species
always had the highest biomasses (Fig. 3). Cutting always had a negative impact on biomass
production, as (even) the sums of the cut + regrown biomasses were lower compared to the
uncut reference plants. The effect of cutting was highly significant (p