Syngenta Summer Autumn Guide 2020 - Page 54



GRASS WEEDS
3. S
PRAYER SETUP IS VITAL TO MITIGATE AGAINST POOR CONDITIONS
AND MAINTAIN EFFICACY
Pre-emergence herbicide treatments create one of the
biggest challenges for effective application. With no crop
to intercept the spray, extra care must be taken to avoid
drift, and to achieve even distribution of droplets on the
soil surface to maximise efficacy.
Trials at Barton and Doncaster last autumn have
confirmed our previous findings around techniques to
balance efficiency, efficacy and environmental impact.
90% DRIFT REDUCTION NOZZLES DELIVER MORE EVEN DISTRIBUTION OF SPRAY DROPLETS
Nozzle choice is a fundamental part of hitting the target and achieving
effective coverage of the soil surface – to get the best control from all preemergence applications. Residual herbicides work via root and shoot activity.
Ensuring an even distribution of product over the soil surface will improve
your chances of controlling the emerging grass and broad-leaved weeds.
In order to maximise the efficacy of your pre-emergence herbicide
application, you need to ensure you have both good coverage and even
distribution. Drift prone nozzles are sensitive to environmental factors,
including wind speed, turbulence created by forward speed and boom
height. The graphics on the right hand side both illustrate 50% coverage.
However, the drift prone nozzle is showing extremely uneven distribution of
the coverage, so we would likely see uneven levels of control. The 90% DRT
nozzle gives much more even distribution of the spray coverage.
Drift prone nozzle
90% DRT nozzle distribution
MITIGATING AGAINST POOR CONDITIONS
Data from our Sencrop weather stations highlighted
that there was only 1 day in autumn 2018 and not a
single day in autumn 2019 where gusts didn’t exceed
7.2 km/h.
% Black-grass control
100
90
80
70
60
50
40
30
20
10
0
In less than ideal conditions 90% drift reducing nozzles
produce a droplet spectrum that delivers more even
distribution on the soil surface for optimum results.
025 FF 100L
(0% drift reduction)
Bad spray day
05 ID 200L
(90% drift reduction)
Good spray day
4.0 l/ha DEFY (PSC) + 0.6 l/ha Liberator (FFT + DFF).
1 site; Average 41 plants/m2
54
To help overcome the challenges associated with the
optimum conditions for spraying we have developed
the Spray Assist app. It combines our trials knowledge
and expertise to provide guidance in nozzle selection to
ensure the most effective application.

Paperturn



Powered by


Full screen Click to read
Paperturn flipbook system
Search
Overview
Download as PDF
Print
Shopping cart
Full screen
Exit full screen