Consórcio do sorgo granífero (Sorghum bicolor L. Moench) e capim-braquiária (Urochloa brizantha cv. Marandu) sob diferentes doses de atrazina

Abstract

The objective was to evaluate the effect of doses of the herbicide atrazine in post-emergence of single sorghum and in consortium with Urochloa brizanthacv. Marandu under agronomic and bromatological characteristics. The treatmentsconsisted of five doses of herbicide based on atrazine (0, 1000, 2000, 3000 and 4000 g ha-1of the active ingredient) following the experimental design in randomized blocks in a 5 x 2 factorial scheme, with five doses and two application times with four repetitions. There was no interaction (P> 0.05) between the doses of atrazine and cultivation systems on plant height, dry matter production (DMP) and grain production (GP). The plant height, DMPand GP was 5.83%, 16.89% and 58.06% higher in the single cultivation system in relation to the consortium (meansof 1.13 meters, 2.35 t ha-1, 1,95 t ha-1), respectively. There was no isolated effect of the doses of atrazine and culture systems on the crude protein content, with an overall average of 7.99%. The single cultivation system improved the mass and grain yield of sorghum. Aiming at the exclusive control of the growth and development of Urochloa brizanthacv. Marandu in systems intercropped with sorghum is not recommended to apply the herbicide Atrazine