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Accueil Tous les numéros Volume 17 / Numéro 5 (Septembre-Octobre 2010) OCL, 17 5 (2010) 292-300 Full HTML
Open Access

Table 3.

Reference cropping system and prospective scenarios proposed by experts and tested with ALOMYSYS for their effects on weed dynamics.

Rotation1 Scenario Number of tillage operations (mean per year over rotation)
 Herbicides (mean per year over rotation)
Mouldboard
ploughing		 Roll Other tools TFI2 Cumulated
efficiency (%)3		 Number in
Autumn Spring
Reference system
OWB R 0.17 0.33 3.83 1.88 2.43 1.50 1.33
Replacing winter barley by spring crop
OWBOWb P 0.17 0.50 3.83 1.48 1.97 1.00 1.33
NP 0.00 0.50 3.83 1.77 2.30 1.17 1.50
OWBOWp P 0.17 0.50 3.67 1.13 1.94 1.00 1.33
NP Not tested
Replacing winter oilseed rape by alternative crop
OWBpWB P 0.17 0.33 3.83 1.27 2.24 1.17 1.50
NP 0.00 0.33 3.83 1.78 2.41 1.17 1.67
OWBPWB P 0.17 0.17 4.17 1.23 2.08 1.00 1.67
NP Not tested
OWBsWB P 0.17 0.33 3.67 1.35 2.08 1.17 1.33
NP Not tested
Adding one alternative crop between cereals
OWpW P 0.25 0.50 4.00 1.40 1.96 0.75 1.75
NP 0.00 0.50 4.00 1.58 2.21 0.75 2.00
OWPW P Not tested
NP 0.00 0.25 4.25 1.30 1.96 0.75 2.00
OWsW P 0.25 0.50 3.50 1.38 1.71 0.75 1.50
NP 0.00 0.50 3.50 1.55 1.96 0.75 1.75
Adding one alternative crop after cereals
OWWp P 0.25 0.50 3.75 1.38 1.91 0.75 1.50
NP 0.00 0.50 3.75 1.55 2.16 0.75 1.75
OWBp P 0.25 0.50 3.50 1.28 1.66 0.75 1.25
NP 0.00 0.50 3.50 1.45 1.91 0.75 1.50
Adding one cereal and one alternative crop
OWpWB P 0.20 0.40 3.80 1.54 2.13 1.00 1.60
NP 0.00 0.40 3.80 1.68 2.33 1.00 1.80
OWpWb P 0.40 0.60 4.00 1.32 1.77 0.40 1.80
NP 0.00 0.60 4.00 1.20 1.56 0.40 1.60
OWsWB P 0.20 0.40 3.40 1.44 1.73 1.00 1.20
NP 0.00 0.40 3.40 1.58 1.93 1.00 1.40
OWsWb P 0.40 0.60 3.60 1.44 1.77 0.40 1.80
NP 0.00 0.60 3.60 1.18 1.36 0.40 1.40
Adding two cereals and one alternative crop
OWsWpW P 0.40 0.60 3.60 1.14 1.34 0.40 1.40
NP 0.00 0.60 3.60 1.42 1.74 0.40 1.80
OWWsWp P 0.40 0.60 3.80 1.30 1.70 0.60 1.40
NP 0.00 0.60 3.80 1.58 2.10 0.60 1.80
OWBsBp P 0.33 0.50 3.33 1.07 1.25 0.50 1.17
NP 0.00 0.50 3.33 1.30 1.58 0.50 1.50
1

O = oilseed rape, W = wheat, B = barley, P = pea, s = sunflower; uppercase letters indicate winter crops, lowercase letters spring and summer crops; the latter were always preceded by temporary (“catch“) crops not indicated in the table.

2

The annual treatment frequency index (TFI) is the sum of all herbicide rates relative to the standard rate and relative to the whole field area (e.g. the TFI for the four management strategies of table 1 are 2, 2.5, 1.2 and 2.2, respectively).

3

Cumulated efficiency per year is the sum of all theoretical herbicide efficiencies at full rate (which corresponds to the actual efficiency in case of optimal spraying conditions).

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