Maize Stover Degradation Under the Influence of Haloxyfop-Methyl Underdoses

Abstract

-One of the major constraints to sustainable tillage is the rapid decomposition of the dry matter. The mechanism known to facilitate this process is the interference in the metabolic pathways of lignin polymers from spraying herbicide underdoses. This study has aimed to verify the effect of underdoses of haloxyfop-methyl in the synthesis of lignin and correlate the interference of this phenolic compound in the decomposition of maize stover. Two preliminary experiments were carried out in a greenhouse to set up the best underdoses to be applied in the yield area experiment. The treatments in the first experiment consisted of: 0; 2.5; 5 and 10 g a.i. ha of haloxyfop-methyl increased in 13% the lignin content without interfering in height and biomass of the plants, contributing to delay the decomposition rate in 4% in the residual stover.Keywords: Zea mays, herbicide, levels of lignin, growth stimulus. de haloxyfop-methyl, acrescidas de 0,5% (v:v) RESUMO -Uma das maiores limitações para sustentabilidade do plantio direto é a rápida decomposição da matéria seca. O mecanismo conhecido para viabilizar esse processo é a interferência nas vias metabólicas dos polímeros de lignina a partir da aplicação de subdoses de herbicida. Este trabalho teve por objetivos verificar o efeito de subdoses do haloxyfop-methyl na síntese da lignina e correlacionar a interferência desse composto fenólico na decomposição da palhada do milho. Dois experimentos preliminares em casa de vegetação foram conduzidos para ajuste das melhores subdoses a serem aplicadas no experimento em área de produção. Os tratamentos, no primeiro experimento, constituíram-se da aplicação do herbicida haloxyfop-methyl nas subdoses

Nitrogen availability and glyphosate hormesis on white oat

“…The data were submitted to analysis of variance by the F test, with p<0.05 for the main effects and p<0.10 for the factors interactions. Data on factorial interactions were fitted to the non-linear regression component of the Lorentzian four-parameter model (Jasper et al, 2016) equation 1, which were plotted using SigmaPlot.…”