1Institute of Forage Crops - Pleven, 5800, Pleven, Bulgaria
2Dobrudzha Agricultural Institute – General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
During the period 2017 - 2018 at the Institute of Forage Crops – Pleven using standard methods in the laboratory condition the allelopathic tolerance of sunflower
varieties to the allelopathic effect was studied and compared of aboveground biomass
from Orobanche cumana Wallr. It was found that: Concentrations of 0.08 to 0.32%
w/v of the aboveground biomass of the sunflower broomrape (Orobanche cumana
Wallr.) exert an inhibitory effect on seed germination and initial development of
the plants of the tested sunflower varieties (Helianthus annuus L.) and can be
conditionally grouped into three groups: I. Group stimulating effect (IR ≤ -10%)
David and Markesa, II. Group Inhibitory effect (IR ≤ 20%) Favorit and III. Group
(IR ≥20%) of San Luca and Enigma
Relatively high allelopathic tolerance to the allelopathic effect of Orobanche
cumana Wallr. Seed germination and initial development of the sunflower varieties
tested were reported in the David and Marquez variety (may be used as components
in future breeding programs), and relatively lower allelopathic tolerance was
reported in the San Luca and Enigma varieties.
