Physiological quality of seeds, growth and partition of assimilates in common bean (Phaseolus vulgaris L.) treated to pre-emergent herbicides

O feij??o ?? um gr??o de grande import??ncia na alimenta????o humana. A cultura do feij??o apresenta v??rios problemas fitot??cnicos, sendo o controle de plantas daninhas de fundamental import??ncia no rendimento e na qualidade final do produto. Este controle ?? muitas vezes realizado com o uso de herbicidas pr??-emergentes pendimenthalin, trifluralin e metolachlor. Desta forma, o objetivo foi estudar a a????o de herbicidas pr??-emergentes sobre a qualidade fisiol??gica de sementes, crescimento e parti????o de assimilados em feij??o cultivar BRS Expedito. Em condi????es de laborat??rio, a qualidade fisiol??gica das sementes de feij??o BRS Expedito foi reduzida com o incremento das doses dos herbicidas, com exce????o do herbicida pendimenthalin que se mostrou menos prejudicial ?? germina????o e ao vigor das sementes de feij??o. O crescimento das plantas de feij??o cv. BRS Expedito na aus??ncia de competi????o com plantas daninhas em casa de vegeta????o sofreu influ??ncia da a????o dos herbicidas a partir da dose recomendada, ressaltando que o herbicida metolachlor prejudicou drasticamente os est??gios iniciais do crescimento e o desenvolvimento das plantas de feij??o. Entretanto, os herbicidas utilizados n??o reduziram o rendimento final de mat??ria seca de vagens e sementes, podendo-se recomendar os mesmos para o uso em pr??-emerg??ncia.The bean is a grain of great importance in the human feeding. The bean culture presents several agronomical problems, being the control of weeds of fundamental importance in the income and in the final quality of the product. This control is a lot of times made with the use of pre-emergent herbicides. Thus, the objective was to study the action of pre-emergent herbicides pendimenthalin, trifluralin e metolachlor the physiologic quality of seeds, growth and assimilates partition in bean cultivar BRS Expedito. In laboratory conditions, the physiological quality of seeds and the viability of the bean seeds cultivar BRS Expedito were reduced with the increment of the doses of all herbicides, except for the herbicide pendimenthalin that was shown less prejudicial to the viability and the vigor of bean seeds. The growth of cv. BRS Expedito bean plants in the absence of competition with weeds under greenhouse conditions suffered influence of the action of the herbicides starting from the recommended dose, emphasizing that the herbicide metolachlor prejudices the initial growth and development of the bean plants drastically. However, the used herbicides did not reduce the final accumulation of dry matter in green beans and seeds, and thus these herbicides could be recommended for the use in pre-emergence