Estimation of species allelopathic susceptibility to perennial weeds by detailing the formation period of germinated seeds of oilseed radish (Raphanus sativus L. var. oleiformis Pers.) as the test object
Kokkuvõte
The allelopathic impact of 23 perennial weed species on
oilseed radish by petri dish and soil bioassays was studied. Weed extracts
were prepared at concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, 8.0 and 16.0%.
The influence of the weed extract on germination and seedling growth of
oilseed radish was analyzed according to several germination indexes. The
"speed of germination", "coefficient of the velocity of germination" and
the resulting levels of allelopathic potential in terms of seed germination
(APG) were used to assess the allelopathic effect of the researched weed
species. The application of indicators allowed determining the specific
features of the influence of extracts of perennial weeds on the duration of
the germination period, the effects of germination delay and the general
prolongation of the period of formation of similar seeds with typification
on classification groups. Conducted daily surveys for the calculation of
these indices allowed to obtain a graphical interpretation of the reaction of
the seeds of the test object to the extract of each weed species. This
allowed identifying species of weeds for which the use of oilseed radish in
the system of its biological control will be effective.