Análise de crescimento de braquiária cultivada em comunidade com milho e picão-preto

Abstract

The growth of both crops and Brachiaria and the Picão-preto depends on the ability of these species to extract resources from the environment in which they live and, in most cases, the supply of these resources is limited. In this context, if the competitive ability of the weed is superior, it may manifest the potential for crop suppression over competing plants. Competition can be intraspecific, occurring between individuals of the same species, whether weed or not, and also interspecific, involving individuals of different species. Thus, the objective of this work was to evaluate the effects of competition between the species corn and Picão-preto and the combination of the two at different densities on the growth of Brachiaria, seeking information about the crop and weeds in order to subsidize management strategies. In this sense, the experiment was set up in a randomized block design using the 2 x 5 factorial scheme, that is, factor A representing the community 1) Urochloa brizantha (brachiaria) + corn and the community 2) Urochloa brizantha (brachiaria) + corn + Bidens pilosa. Factor B represented by 5 densities and four replications. The growth of Brachiaria was negatively affected by the two combinations tested, highlighting that in this work, Brachiaria plants competed with increasing densities of plants of the same species and increasing densities of Picão-preto plants or the combination of the two species of Picão-preto and Brachiaria.