Efficacy of glyphosate on David Spurge (Euphorbia davidii Subils) control under different levels of P and S / Eficácia do glyphosate no controle David Spurge (Euphorbia davidii Subils) em diferentes níveis de P e S

NÚÑEZ FRÉ, FEDERICO ROBERTO; JUAN, VÍCTOR FABIAN; SAINT-ANDRÉ, HORACIO MARÍA; CHANTRE, GUILLERMO RUBÉN

Brazilian Journal of Animal and Environmental Research

Brazilian Journals Publicações de Periódicos e Editora Ltda.

Lugar: Curitiba; Año: 2022 vol. 5 p. 1090 - 1104

2595-573X

Euphorbia davidii Subils is one of the main weed species present in the central area of Argentina. The objective of this work was to evaluate the efficacy of glyphosate on E. davidii control, under different phosphorus and sulfur content in the soil. The aim of this study was to evaluate the influence of the P and S contents in the soil on the efficacy of glyphosate to control E. davidii. Two independent experiments were conducted in 2014 and 2015 in a completely randomized design with four replications, using three doses of glyphosate (0, 712, 1068 and 1424 g a.e. ha-1) on plants growing with three levels of P and S (5, 10 and 15 ppm P and SO4-2 respectively). At 5 ppm SO4-2, the 712 g a.e. ha-1 dose of glyphosate showed phytotoxicity ≤ 50% and evidenced differences with the 1068 and 1424 g a.e. ha-1 doses of the herbicide. The shoot dry weight showed only differences between the doses of glyphosate applied at low levels of phosphorus (5 ppm P). Besides, we observed that nutritional deficiency causes a delay in the onset of symptoms of phytotoxicity related to glyphosate. We can conclude that the nutritional status of E. davidii plants influenced the efficacy of glyphosate treatments. Finally, we suggest to check and control the nutritional status of agricultural plots and include fertilization practices as part of the information for decision-making within integrated weed management.