Do Aqueous Extracts from Buckwheat Compromise Seed Germination and Initial Development of <i>Bidens pilosa</i> and <i>Euphorbia heterophylla</i>?

Fagopyrum esculentum Moench (buckwheat) is a dicot species from the Polygonaceae family used as cover crop in agricultural systems featured with remarkable allelopathic potential for weed control, helping herbicide-resistance management and promoting substantial reductions herbicide applications. The aim of this research was to examine aqueous extracts seeds aerial part buckwheat on seed germination initial development Bidens pilosa Euphorbia heterophylla. Bioassay experiments were conducted under completely randomized experimental design four replications, containing 50 each. Both harvested soybean field, viability previously assessed. Seeds exposed concentrations (0, 25, 50, 100%) (ES) (EAP) buckwheat. Germination speed index (GSI) B. E. heterophylla daily evaluated throughout 14 16 days, respectively, whereas percentage germination, abnormal seedlings, well non-germinated seeds, root (RL) length (APL), total dry matter (TDM) rated at final test. EAP reduced GSI, especially 100% concentration. lower seedlings increased both when greater than 25%. However, ES did not impinge upon germination. APL, RL, TDM 50%, except which affect development. have high capacity inhibit compromise seedling development, culminating such alternative systems.