Evaluation of losses of imidacloprid from conventional and modified pneumatic drills for maize
Biocca, M.; Conte, E.; Faraci, A.; Pochi, D.
XXXIII CIOSTA - CIGR V Conference 2009, Reggio Calabria (Italy) “Technology and management to ensure sustainable agriculture, agro-systems, forestry and safety”
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Via Mercalli, 28 - Reggio Calabria
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|Abstract in English:|
In the last years, some pesticides employed in maize seed dressing (i.e. the neonicotinoid
imidacloprid) have been claimed to play a role in honeybees decline. Since a certain quantities of
active ingredients (a.i.) can be emitted from drills machineries during the sowing operation,
investigations have been carried out aimed at: (1) investigate the critical points of the machines
related to seed dressing particle losses; (2) design a test methodology in order to provide the a.i.
losses; (3) determinate the a.i. drift as a consequence of the use of conventional and modified
pneumatic drills. Three pneumatic maize drills have been tested in tests at fixed point and in field.
The results show that the a.i. amounts globally expelled from the drill fan opening ranged from 600
up to more than 1200 mg ha-1. The results of in-field tests show a particularly relevant reduction (up
to 76%) for the first modified drill, as for the second drill it has been lower (37%), confirming the
losses reduction with respect to the data obtained from conventional drills. The results suggest that the
deflectors could represent a practical solution for the drills in use. Then, new and effective solutions
could be developed by the manufacturers for being applied on the new drill models.