Abstract

Weed control is commonly performed by the inter-row mechanical weeding associated to intrarow glyphosate directed spraying, causing a risk for drift or accidental herbicide application, that can affect the crop of interest. The objective was to evaluate the response of clones C219, GG100, I144, and I224 of eucalypt (Eucalyptus grandis x E. urophylla) to glyphosate doses of 0, 18, 36, 72, 180, 360, and 720 g of acid equivalent per hectare. The clones showed different growth patterns with regard to height, leaf number, stem dry weight, relative growth rate, net assimilation rate, and relative leaf growth rate. The clones I144 and GG100 were more susceptible to glyphosate, showing the doses required to reduce dry weight by 50% of 113.4 and 119.6 g acid equivalent per hectare, respectively. The clones C219 and I224 were less susceptible to glyphosate, showing the doses required to reduce dry weight by 50% of 237.5 and 313.5 g acid equivalent per hectare, respectively. Eucalyptus clones respond differently to glyphosate exposure, so that among I224, C219, GG100, and I144, the susceptibility to the herbicide is increasing.

Highlights

  • Forest species of the genus Eucalyptus have high potential for wood production due to their biodiversity, environmental adaptability, high productivity, and excellent wood physic-chemical characteristics, allowing the eucalypt to show many uses as a wood-based raw material

  • Have been commonly performed by the inter-row mechanical weeding associated to the intra-row glyphosate directed spraying (CARVALHO et al, 2012a), causing a risk for spray drift if the herbicide is sprayed under inadequate environmental conditions or/and the application technology is misused (MACHADO et al, 2010)

  • There was significant interactions between the factors clones and doses for plant height (P = 0.018), leaf number (P = 0.006), stem dry mass (P = 0.003), relative growth rate (P = 0.042), net assimilation rate (P

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Summary

Introduction

Forest species of the genus Eucalyptus have high potential for wood production due to their biodiversity, environmental adaptability, high productivity, and excellent wood physic-chemical characteristics, allowing the eucalypt to show many uses as a wood-based raw material. Have been commonly performed by the inter-row mechanical weeding associated to the intra-row glyphosate directed spraying (CARVALHO et al, 2012a), causing a risk for spray drift if the herbicide is sprayed under inadequate environmental conditions or/and the application technology is misused (MACHADO et al, 2010). The spray drift is defined as the transport of small drops (formed during the pesticide spraying) into the out of the target area (soil or/and leaves for herbicides), constituting in one of the main causes of herbicide losses in field conditions (COSTA et al, 2012b). Herbicide drift may contaminate the food, the air, the soil, and the water resources as well as it may cause detrimental effects on human and animal security and health (COSTA et al, 2012b)

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