Syngenta Summer Autumn Guide 2020 - Page 51



THREE YEAR CULTIVATION STRATEGY FINDINGS – BLACK-GRASS CONTROL AND MARGIN
Difference in margin between the best and worst cultivation strategies over
three years
100
3600
99
3400
Continuous
Min-till Worst black-grass control
Continuous
Direct Drill
(DD)
Continuous
Min-till
Continuous
Plough
94
Plough/
DD/DD Worst margin
95
Direct Drill/
Plough/DD Best black-grass control
96
93
3200
£553
3000
2800
2600
Margin (£)
97
Direct Drill/
Min-till/DD Best margin
% Black-grass control
98
Our findings suggest that using the
same cultivation year on year isn’t
the way to achieve the best margin
or black-grass control.
WE FOUND:
BEST MARGIN: DD/Min-till/DD
BEST BLACK-GRASS CONTROL:
DD/Plough/DD
WORST MARGIN: Plough/DD/DD
WORST BLACK-GRASS CONTROL:
Continuous Min-till
CLICK TO SEE how the
seasonal context of those
cultivations affected these
findings
Margin over establishment & herbicide costs (WW @ £1302)
Overall black-grass control (%) vs. untreated (1459/m2)
DORMANCY AND ITS IMPACT
ON WEED PRESSURE
DORMANCY of freshly shed seed varies due
to the weather conditions during maturity
High dormancy = low germination
Low dormancy = high germination
Weather conditions during
maturation influence the dormancy
of black-grass: a hot, dry year
results in low dormancy in freshly
shed seed, whereas a cool, wet year
triggers a higher level of dormancy.
At Barton, dormancy tests have
shown high dormancy in all seasons
except 2018/19, following the hot
summer of 2018.
SEASON
BLACK-GRASS
DORMANCY
(% germination)
2016-17
High (19%)
2017-18
High (29%)
2018-19
Very low (99%)
2019-20
Very high (8%)
CULTIVATIONS bring old seed to the
surface. This isn’t dormant and will
emerge rapidly
CULTIVATION DEPTH
Seed emerges from the top 5 cm of
the soil
MOISTURE
Seed will only germinate when there is
enough moisture
AMOUNT OF SEED IN THE SEEDBAN
How much is present from previous years?
How much is being moved to the
emergence zone?
Source: ADAS
51

See how the seasonal context of these cultivations affected these findings

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