Weed Control J 2023; 22: e202300826

ISSUE Cover

Selectivity of herbicide associations applied in post-emergence of maize grown in second season

DOI: 10.7824/wcj.2023;22:00826

Abstract:

Background:

The weed interference in maize is one of the main obstacles to obtaining high yields in this crop. In this context, the use of herbicides constitutes the main method of control, and can have great success for the farmer if used at the time (stage) and recommended doses.

Objective:

The objective of this work was to evaluate the selectivity of herbicide associations applied in post-emergence of maize cultivated under second-season conditions.

Methods:

A field experiment was set up in a randomized completely block design, evaluating eleven treatments, with four replications adopted. The treatments consisted of the post-emergence application of herbicides to maize, in isolated, in commercially formulated mixtures, and/or in tank mixtures, with the following active ingredients in their composition: nicosulfuron, mesotrione, and atrazine. At the time of treatments application, the maize plants were in the V3/V4 stage. Evaluations of phytointoxication, plant stand, ear insertion height, yield components, and grain yield were carried out.

Results:

Phytointoxication levels were low due to the post-emergence application of herbicide treatments in maize. In general, the mixture formulated based on atrazine + mesotrione provides less phytotoxicity compared to the tank mixture of these active ingredients. Yield components related to corn ears were not affected by post-emergence herbicide application.

Conclusions:

All herbicides applied post-emergence of maize plants, regardless of whether they are used isolated or in combination, are selective for this crop.