Portuguese

Maria Renata Rocha Pereira,Guilherme Sasso F De Souza,Ana Cláudia Macedo,José Iran Cardoso Da Silva,Dagoberto Martins

doi:10.14393/bj-v31n1a2015-21883-

Abstract

portuguese

Highlights

The interference of weeds on crops can occur through competition for resources necessary for their growth, such as water, light and nutrients, as well as for the allelopathy
The objective of this study was to relate the efficiency of ACCase to control herbicides inhibition during post-emergence in E. indica plants under water stress, and to determining the soil water potential that may harm the efficiency of the herbicides and whether there are differences among the tested molecules
The herbicide haloxyfop-methyl resulted in 87% control and fluazifop-p-butyl reached an average of 93% efficiency. These results suggest lower efficacy of these products, except the herbicide haloxyfop-methyl, when applied to plants without water deficit compared to plants exposed to water management at 10 and 8%, as observed at evaluations 7 DAA

Summary

Introduction

The interference of weeds (especially the grasses) on crops can occur through competition for resources necessary for their growth, such as water, light and nutrients, as well as for the allelopathy. As the cultivated plants have already gone through improved breeding for increased productivity, they suffer most from the effects of weeds competition (FONTES, 2003), which present high photosynthesis rates in the same level of brightness, with for example in grasses, which are three times higher than that reported for beans (PORTES, 1988). To achieve greater efficiency through the use of herbicides (post-emergent) the plants should present a high metabolic activity, which may be influenced by water restriction (COBUCCI et al, 2001). Some types of stress interfere with the absorption of herbicides, for instance, high temperatures and water restriction, which can increase the cuticule of thickness, favoring the evaporation of water droplets and volatilization of applied products. In E. indica plants, the sethoxydim herbicide had their effectiveness impaired when applied to plants under water stress (PEREIRA et al, 2011)

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