Weed Control J 2023; 22: e202300762

ISSUE Cover

Selectivity of corn hybrids with pat gene to the ammonium-glufosinate herbicide

DOI: 10.7824/wcj.2023;22:00762

Abstract:

Background:

Corn (Zea mays L.) cultivation plays a fundamental role in the various production chains within agribusiness. Among the factors that significantly interfere with corn cultivation, weeds deserve to be highlighted, as they can cause a reduction of up to 80% in grain yield. It is essential to find post-emergence control alternatives in corn crops, especially with the increase in weeds resistant to glyphosate. Thus, the herbicide glufosinate-ammonium can be an alternative for control weeds in post-emergence in corn.

Objective:

Therefore, the presente study aims to evaluate the response of corn hybrids to different doses of glufosinate-ammonium applied in post-emergence.

Methods:

The experiment was conducted in the 2018/2019 harvest, in subdivided plots, where the main plot corresponded to the hybrids and the subplots to the doses of glufosinate-ammonium. Phytotoxicity assessments were carried out 7, 14, 21 days after application of the herbicide, and grain yield was evaluated at the end of the crop cycle.

Results:

Phytotoxicity assessments demonstrate that the hybrids show rapid recovery from the injury caused by the herbicide.

Conclusions:

The corn hybrids 30F53 VYHR, P3016 VYHR, NK422 VIP3, NK505 VIP3, Maximus VIP3, P1680 VYH, 32R48 VYHR, BG7318 VYHR, NK488 VIP3 (all with pat gene), show high tolerance to post-emergence application of glufosinate up to a maximum dose of 1600 g ai ha^-1. Despite the visual injury observed at the highest doses, there was no impact on grain productivity and other agronomic performance variables evaluated.