Potencial alelopático de Bidens pilosa L. sobre a germinação e desenvolvimento de plântulas de culturas de verão

Abstract

Weeds cause various types of interference in agricultural crops. Some plants, through secondary metabolism, produce substances called allelochemicals, which may have a detrimental effect on the growth and development of neighboring plants. Generally the areas of annual crops are fallow at certain times of the year thus allowing the growth of many weeds, making them predominant in the area during this period, so it becomes important to know the effects of these species on agricultural crops . The objective of this work was to evaluate the effect of different concentrations of aqueous extracts of Bidens pilosa L. on the germination of seedlings growth of Zea mays L. (maize), Phaseolus vulgaris L. (common bean) and Glycine max (L.) Merr. (Soy). The objective of this study was to evaluate the germination speed index (IVG), the germination percentage, the length and the dry mass of the seedlings. The seeds of the cultures were exposed to concentrations of 0%, 1%, 5% and 10% of aqueous Bidens pilosa L., stored in BOD for 10 days and then evaluated for germination, IVG, normal and abnormal seedlings, length and dry mass of seedlings. The aqueous extract of Bidens pilosa L. caused a negative effect on the IVG, length and normality of seedlings of the bean, soybean and corn cultures, on the germination of the beans and dry mass of the beans and corn.