Eficácia do herbicida amicarbazone no controle em pós-emergência de espécies de corda-de-viola (Ipomoea grandifolia e Merremia cissoids)

Abstract

Different weeds species are present in Brazilian sugar cane areas interfering negatively in productive process, and morningglory species, Ipomoea sp. and Merremia sp., are outstanding, particularly in raw cane areas. This way, the objective of this study was to verify the effectiveness of amicarbazone herbicide in controlling Ipomoea grandifolia and Merremia cissoides species, applied in post emergency and compared to 2,4-D herbicide. So, it was conducted an experiment, in green house conditions, in pots, with Latossoil Red distrofic (LRd), seeded with weeds. The experimental design used was entirely randomized with five treatments and four replications, and mediums submitted to Tukey test at 5% of probability. Treatments consisted of 700, 1050, 1400 g i.a. ha-1 of amicarbazone, 1612 g i.a. ha-1 of 2,4-D and an check. Treatments application was carried out in post-emergence, when weeds containing 15 cm tall, and at 7, 14 and 21 days after application (DAA) and the control was assessed, with dossel plants collect for obtaining dry mass, at 21 DAA. After collecting plants, it was conducted a new sowing in pots with the same weeds species and at 7, 14 and 21 days after sowing (DAS) visual control evaluations were conducted, in order to verify the residual effect of treatments. The experimental design was entirely randomized with five treatments and four replications, and mediums submitted to Tukey test at 5% of probability. It was verified that, independent of morningglory species studied, amicarbazone herbicide at 700, 1050, 1400 g i.a. ha-1 doses showed total control at 21 DAA, as well as up to 21 DAS, it was also observed excellent residual effect for this herbicide.