Análise de crescimento de duas cultivares de cevada após tratamentos com elicitores e fungicidas

Abstract

In order to control barley boun spot, caused by Bipolaris sorokiniana, fungicides and more recently elicitors have been used. The objective of this work was to evaluate the development of two barley cultivars (BRS 195 and 225) in response to treatment with two elicitors xanthan gum and alicin and the fungicide epoxiconazole + pyraclostrobin compared with non treated control plants. The experiment was carried out at Fundação Agrária de Pesquisa Agropecuária (FAPA), Guarapuava - PR, in a randomized complete block design. In the growth analysis, they were performed calculating the leaf area index (LAI), relative growth rate (RGR) and net assimilation rate (NAR). A similar development was observed for both cultivars in all treatments. The cultivar BRS 225 showed higher dry weight accumulation during the evaluation period than cultivar BRS 195 because of its shorter vegetative growth phase. The LAI increased until the boot stage following decrease. The RGR decreased from the first to the last evaluation. The NAR decreased until 57 days after emergency and then increased during all remaining evaluations.