1 Институт по фуражните култури, Плевен, ул. Ген. Владимир Вазов, 5800, България
2 Добруджански земеделски институт, 9521, Генерал Тошево, България
3 Аграрен университет, Пловдив, бул. Менделеев, 12, 4000, България
Резюме
The allelopathic effect of dry biomass of sunflower broomrape (Orobanche
cumana Wallr.) collected from different regions of the Republic of Bulgaria was
studied in laboratory conditions.
It was found that concentrations from 8.0, 16.0 and 32.0% w/v dry weed biomass
of broomrape showed an inhibitory effect on the germination of seeds (from 3.8 to 37.2%) and on the initial development (from 13.1 to 84.2%) of test plants Lactuca
sativa L.
Test samples sunflower broomrape (Orobanche cumana Wallr.) are indicative of
indifferent - to strong allelopathic effect on the development (GI) of the Lactuca
sativa L. and can be conventionally grouped into three groups. First group –
(strong allelopatic effect, GI to 39%) from the ecological geographic region of
Kardam (first location) and the Dobrudzha Agricultural Institute, General Toshevo
(infectious field), Second group - (weak alleleptic effect, GI from 40 to 59%) with
locations Kardam (second location), Dyakovo, Radnevo and Sozopol - broomrape
on Artemisia maritima L. and third group - (indigenous, GI over 60%) - from the
ecological geographic region of Dobrudzha Agricultural Institute, General Toshevo
(experimental field), Selanovtsi and Svishtov.
With the highest total allelopatic potential, the broomrape originating from
Dobrudzha Agricultural Institute, General Toshevo (Infectious field) OAR (average)
0.6 and lowest in variants P5 and P9, respectively Tyulenovo and Radnevo OAR
(mean) 0.3, probably due to their genetic differences.
Key words: Allelopathic effect, Broomrape, Lactuca sativa L.
