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In order to study the allelopathic effect of aboveground dry biomass of Sorghum\udhalepense, Convolvulus arvensis and Cirsium arvense on seed germination and early seedling\udgrowth of Pisum sativum (L.), varieties Mir (winter form) and Kerpo (spring form); Vicia sativa\ud(L.), variety Tempo, and Medicago sativa (L.), variety Dara, a laboratory experiment was conducted\udat the Institute of Forage Crops - Pleven. Four concentrations: 1.25, 2.5, 5.0 and 10.0%\udwere applied to each weed biotype used to study allelopathic effects. The results showed\udthat weed extracts significantly decreased germination percentage, shoot and root length\ud(cm), shoot and root weight (g), and seed vigor index (SVI1 and SVI2) of the tested species.\udIn general, the variable effects are related to the weed species and extract concentrations

pesticidi i fitomedicina

Allelopathic effects of water extracts of Sorghum halepense (L.) Pers., Convolvulus arvensis L. and Cirsium arvense Scop. on early seedling growth of some leguminous crops