Ефективност на някои почвени хербициди при зимна обикновена пшеница сорт „Дунавия”
Светлана Стоянова
Институт по земеделие и семезнание „Образцов чифлик” – Русе, България
Резюме
During 2013-2016 in the experimental field of the Institute of Agriculture and
Seed Science “Obraztsov Chiflik” - Ruse, on soil type strongly leached chernozem,
a study was carried out on the density and species composition of weeds in
„Dunaviya” wheat variety. The effectiveness of the herbicides: Afalon 45SK
(450g.l-1 linuron), Stomp 330EK (330g.l-1 pendimethalin) and Zenkor 70BG
(700 g.kg-1 metribuzin), was studied and applied at optimal and dual high doses
in weed control and the influence on grain yield. The herbicides were fertilized
by back mounted sprayer at a working solution of 30 l.da-1, applied after wheat
sowing before emergence at optimal and increased doses. The field experiment
was started after the block method in four replications, harvesting plot being
50m2 and randomized location of the variants. The objective of the study was the
effectiveness of three soil herbicides applied at optimal and higher doses to the
species composition of weed associations in wheat “Dunaviya” to be determined.
The highest effectiveness against mixed type of weed infestation was showed in
herbicides: Stomp 330EK and Zenkor 70VG, in both doses tested, that ranged over Key words: Effectiveness, Grain yield, Herbicides, Weeds, Wheat
the period ranged from 74% (98%) to 88% (92%). Zenkor 70VG had a slight toxic
effect on wheat plants. The meteorological conditions in years strongly influenced
on the effectiveness of the tested herbicides.