... depending on the ecosystem studied: wheat in May, the field before spring sowing, and autumn generation weed in September (new field plowed). From time to time were determined plants with white petals. ...
... influencing the above-ground biomass yield at sunflower. Researches were performed in field experiments in 2013, in two locations from South Romania, respectively Fundulea (44o28’ N latitude and 26o27’ ...