Sensibility of sugarcane cultivars to pre and post-emergence herbicides

Fernanda Maria Rodrigues Castro,Adenilson Henrique Gonçalves,José Airton Rodrigues Nunes,Marcos Machado Mourão,Adriano Teodoro Bruzi,Luiz Antônio De Bastos Andrade

doi:10.18406/2316-1817v11n120191234

Fernanda Maria Rodrigues Castro, Adenilson Henrique Gonçalves + Show 4 more

Open Access

https://doi.org/10.18406/2316-1817v11n120191234

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Journal: Revista Agrogeoambiental	Publication Date: May 31, 2019
Citations: 1	License type: CC BY 4.0

Affiliation: Universidade Federal de Lavras

Abstract

Chemical control is used to restrain the attack of weeds on cultivated crops in Brazil; however, the overuse of chemical products can cause damage to the crops. This study aimed to evaluate the phytotoxicity caused by pre-emergence (PRE) and post-emergence (POST) herbicides in sugarcane cultivars and their influence in agronomic and technological traits as well as to verify the existence of correlation between the herbicides effect and the measured traits. The experiment was carried out in a randomized complete block design with three replications, considering the factorial combination of five sugarcane cultivars and five control strategies, being four herbicides and one control. The sensitivity was evaluated at 30, 60 and 90 days after application, through a scale of intoxication symptoms. The herbicides with active ingredients diuron + hexazinone and ametryn presented more phytotoxicity effect; the cultivars RB867515 and SP81-3250 showed greater toxicity symptoms when exposed to the agrochemicals. Plant height was the only trait influenced by the herbicides. It was observed a significant correlation between the trait number of stems and phytotoxicity effect.

Highlights

Sugarcane planting is one of the earliest relevant economic activities in Brazil, being part of the national agribusiness as the third most important agricultural commodity (MAPA, 2017), playing a meaningful economic and social role
This study aimed to evaluate the phytotoxicity caused by pre-emergence (PRE) and post-emergence (POST) herbicides in sugarcane cultivars and their influence in agronomic and technological traits; it intended to verify the existence of correlation between the effect of the herbicides and the measured traits
Considering the joint statistical analysis of the days after herbicides application (DAA), differences were observed in relation to phytotoxicity for cultivars, days after application (DAA) and interaction cultivars versus herbicides

Summary

Introduction

Sugarcane planting is one of the earliest relevant economic activities in Brazil, being part of the national agribusiness as the third most important agricultural commodity (MAPA, 2017), playing a meaningful economic and social role. This importance is attributed mainly to its versatility and multiple uses as raw material to sugar and alcohol production; as electric energy by the sugarcane bagasse. The herbicides are selective and control weeds without affecting the main crop; the plants tolerance to a particular herbicide can be changed if it is used incorrectly (RIZZARDI; FLECK, 2004; TORRES et al, 2012)

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