New solutions in plant protection applications are still highly desirable. Aiming at higher efficiency, environmental safety and profitability of production which, in addition to
reducing the costs of the application of plant protection products, limits the destruction
of soil structure combined use of agrochemicals seems to be one of the most important
method in modern agriculture. In 2016 and 2017, the Plant Protection Institute – National
Research Institute in Poznań, Poland, conducted field experiments on the possibility of
combining two popular herbicides used to control monocotyledonous weeds: pinoxaden
and fenoxaprop-P-ethyl, with a two-component plant growth and development regulator
(mepiquat chloride and prohexadione calcium) on KWS Ozon winter wheat. The tested
substances were applied at the BBCH 24 stage of winter wheat – herbicide only, and at
the BBCH 31 stage – a mix of herbicides with a plant growth and development regulator.
Regardless of the method of application of pinoxaden (herbicide only or mixed), high effectiveness of Apera spica-venti control was obtained in both years of the study. The mix
of pinoxaden with mepiquat chloride and prohexadione calcium reduced the wheat crop
height to a similar extent as separate application of the substances. The combined application of fenoxaprop-P-ethyl with mepiquat chloride improved the effectiveness of wheat
crop height control. The method of application of the substances had no significant effect
on winter wheat yield. Grain yields harvested from plots treated with the above substances
were significantly higher than control only in the case of high weed infestation of winter
wheat. The technological value of wheat grain depended on the year of study, while the
method of application did not have a significant impact on the evaluated parameters.
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