Abstract

ABSTRACT Glyphosate is a non-selective herbicide used for weed control in eucalyptus forests. Glyphosate drifts are common and may cause serious damage to crops. An alternative to reduce such effects is to use antidotes capable of protecting eucalyptus. An experiment was conducted to evaluate the effects of the application of liquid fertilizer on eucalyptus plants subjected to a glyphosate drift simulation. The treatments were arranged in a 5 x 5 factorial design. The first corresponding factor was liquid fertilizer (0, 1, 2, 4, and 8 L c.p. ha -1 of Fertiactyl Pós®) and the second factor dose of glyphosate drift (0, 360, 720, 1,440, and 2,160 g e.a. ha -1). The products were applied together so that the spray did not reach the upper third of the plants. At 7, 28, and 49 days after application (DAA), the percentage of intoxication of eucalyptus was evaluated. At 56 days DAA, height, leaf area, leaf nutrient contents, and shoot and root dry matter were determined. Higher doses of glyphosate (1,440 and 2,160 g ha -1) caused intoxication levels above 90% at 28 and 49 DAA without using liquid fertilizer. The combination of 2,160 g ha -1 of glyphosate with 8.0 L ha -1 of liquid fertilizer resulted in an estimated eucalyptus dry matter 7% higher than in the control and 97% higher than using 2,160 g ha -1 of glyphosate without the liquid fertilizer. We conclude that the liquid fertilizer was effective in suppressing the harmful effects caused by glyphosate on eucalyptus plants.

Highlights

  • Glyphosate is the main herbicide used for weed control in eucalyptus crops

  • The liquid fertilizer reduced the toxic effects of glyphosate (Figure 2)

  • It is noteworthy that such glyphosate values, applied only to the base of the plants, do not represent a drift because they are higher than drifts that occur in the field

Read more

Summary

Introduction

Glyphosate is the main herbicide used for weed control in eucalyptus crops. It is a systemic and non-selective product used in direct applications through protected bar sprayers or knapsack sprayers. An alternative to reduce damage caused by glyphosate is to use antidotes to protect eucalyptus plants. A product with a possible protection effect on eucalyptus plants affected by glyphosate is Fertiactyl Pós® (TIMAC AGRO, 2014).

Objectives
Results
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call