Residual Doses of Herbicide Affect the Initial Development of Hymenaea stigonocarpa

Abstract The aim of this study was to assess the effect of subdoses of 2,4-D + picloram on the emergence and initial growth of Hymenaea stigonocarpa. Three experiments were carried out. In the first one, the seeds were planted in sand with residues of 2,4-D + picloram (0; 0.02; 0.10; 0.20 and 0.40 L ha -1 ). The second experiment was conducted with seedlings, using the same treatment of experiment I. In experiment III, the seeds were planted in Red Latosol contaminated with subdoses of 2,4-D + picloram (0; 0.02; 0.08; 0.24; 0.48 and 0.96 L ha-1). The contamination of the sand substrate with subdoses of 2,4-D + picloram inhibits the emergence and senescence of Hymenaea stigonocarpa plants. Moreover, when seeds of this species were cultivated in Red Latosol with residual doses between 0.04 and 0.96 L ha-1, emergence and emergence speed index declined.