Diversifying crop rotations with temporary grasslands - Université de ...
Diversifying crop rotations with temporary grasslands - Université de ...
Diversifying crop rotations with temporary grasslands - Université de ...
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Biomass [g dry matter m -2 ]<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
400<br />
200<br />
0<br />
T2 Med Aut C-<br />
T4 Med Aut C+<br />
T5 Med Spr C+<br />
T6 Dac Spr C+<br />
T7 Dac Aut C+<br />
T8 Dac Aut C-<br />
T9 WB T+<br />
669g 559g<br />
838g<br />
820g 769g<br />
1.9<br />
1.11<br />
1.1<br />
1.3<br />
1.5<br />
1.7<br />
1.9<br />
1.11<br />
1.1<br />
1.3<br />
1.5<br />
1.7<br />
1.9<br />
1.11<br />
Crops<br />
Lucerne<br />
Dactylis<br />
W-Wheat<br />
S-Barley<br />
Weeds<br />
VERPE<br />
STEME<br />
SON<br />
SINAR<br />
POL<br />
LOLMU<br />
GERDI<br />
GALAP<br />
CHEAL<br />
BROST<br />
AMARE<br />
ALOMY<br />
Other grasses<br />
Other dicots<br />
2006 2007 2008<br />
2006 2007 2008<br />
Fig. 18: Temporal <strong>de</strong>velopment of <strong>crop</strong> and weed biomass Time<br />
in perennial and annual <strong>crop</strong> treatments.<br />
Left part: Mean absolute biomasses of <strong>crop</strong>s and weeds (g dry matter above 5 cm from the soil surface per m²,<br />
N=4). Cumulated values higher than the plotted limit (400g/m²) are given as numbers. Biomasses go down to<br />
zero at <strong>crop</strong> cutting harvesting dates. Successive measurements are linearly interpolated; however, real biomass<br />
dynamics may differ. Right part: Relative biomass of grass (□ quadrats) and broad -leaved (○ circles) weeds<br />
expressed as the ratio of weed biomass on total (<strong>crop</strong> + weed) biomass. Each point linked by traits represents one<br />
replicate block. Med, Medicago sativa; Dac, Dactylis glomerata; Aut, autumn sown; Spr, spring sown; C+, 5<br />
cuts/year; C-, 3 cuts/year (see Table 6B or Fig. 16 for cutting dates); WB T+, succession of annual <strong>crop</strong>s <strong>with</strong> soil<br />
93<br />
Ratio weed BM / total BM<br />
Broadleaved<br />
weeds<br />
Grass<br />
weeds<br />
1.0<br />
T2 Med Aut C-<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
T4 Med Aut C+<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
T5 Med Spr C+<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
1.0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
1.0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
1.11<br />
T6 Dac Spr C+<br />
T7 Dac Aut C+<br />
T8 Dac Aut C-<br />
T9 WB T+<br />
1.1<br />
1.3<br />
1.5<br />
1.7<br />
1.9<br />
1.11<br />
1.1<br />
1.3<br />
1.5<br />
1.7<br />
1.9<br />
1.11