O feijão é uma cultura de extrema importância econômico-social, e assim como qualquer cultura está sujeito a fatores de natureza biótica, como a interferência de plantas daninhas, ou abiótica, que direta ou indiretamente influenciam não só a sua produtividade biológica, como também o sistema de produção empregado. Diante disso, o trabalho teve o objetivo de avaliar o efeito da interferência de picão–preto (Bidens pilosa) e capim-marmelada (Urochloa plantaginea), bem como seu efeito em diferentes doses de fertilizantes. O experimento foi conduzido em ambiente protegido testando a influência de três doses de N, P e K sobre o crescimento do feijão e a dinâmica das plantas daninhas. O efeito da competição entre cultura e plantas daninhas promove perdas no desenvolvimento do feijoeiro que são agravadas pela redução da quantidade de adubo presente no substrato. A competição é mais prejudicial ao feijoeiro quando em convivência com picão-preto e na combinação, capim-marmelada e picão-preto.Palavra-chave: Bidens pilosa, NPK, Phaseolus vulgaris, Urochloa plantaginea. EFFECT OF BEAN COMPETITION WITH WEED IN DIFFERENT FERTILIZER DOSES ABSTRACT:Bean is a culture of extreme economic and social importance, and just as any culture is subject to factors of a biotic or abiotic nature, which directly or indirectly influence not only its biological productivity, but also the production system employed. In this way, the presence of weeds can lead to decreases in production. Therefore, the objective of this work was to evaluate the effect of Hairy beggarticks (Bidens pilosa) and Alexander grass (Urochloa plantaginea) commonly found in bean crops, as well as its effect on different doses of fertilizers. The experiment was conducted in protected environment testing the influence of three doses of N, P and K on bean growth and weed dynamics. The effect of competition between crop and weeds promotes losses in bean development that are aggravated by the reduction of the amount of fertilizer present in the substrate. The competition is more damaging to the common bean when living with Hairy beggarticks and in combination, Alexander grass and Hairy beggarticks.Keywords: Bidens pilosa, NPK, Phaseolus vulgaris, Urochloa plantaginea. DOI:
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