TOLERÂCIA DO CAPIM - AMARGOSO (DIGITARIA INSULARES) AOS HERBICIDAS IMAZETAPIR+FLUMIOXAZINA E SULFENTRAZONA

Abstract

Bitter grass (digitaria insularis) is a species native to the American continent and, as such, has always been considered an important invader in Brazil. Herbicide residues are those that remain in the soil for some time after application to control weeds. The residual effect of herbicides on the soil can impair cultivation in succession of sensitive crops and reduce productivity and product quality, a phenomenon known as carryover. After the applications of pre-emergent (Imazetapir + Flumioxazin and Sulfentrazone) made in the weed-bitter weed (Digitaria insularis), the emerald cucumber was sown in the pots (two seeds per pot), where the same pots used in the application of bitter grass. There were 4 (four) different doses for each product (50, 75, 100 and 200) % with 4 (four) repetitions of each product totaling 32 vessels. Statistically, we had due results, such that: at 7 DAA, Boral was more efficient for the control of bitter grass and in the 14 days this result was shown again, in all doses worked. For 21 and 28DAA, the behavior of the two herbicides was similar in all doses, showing that both are more efficient after 21 days of application, presenting phytotoxicity above 90% for the control of bitter grass (Digitaria insularis).