Defoliation in ‘Pinotage’ during the harvests 2014/15 and 2015/16 in Dom Pedrito-RS

Federal University of Pampa (UNIPAMPA) – “Dom Pedrito” Campus – Course of Bachelor's Degree in Oenology. Adress: Street Vinte e Um de Abril n ∘ 80, “Dom Pedrito”, “Rio Grande do Sul” (RS), CEP 96450-000, Brazil

^a e-mail: juanaguila@unipampa.edu

Abstract

The objective of this study was to evaluate the effect on must from defoliation in ‘Pinotage’ in a property in the region Dom Pedrito, conducted in espalier and from East / West direction. The work was performed by the Nucleus of Study, Research and Extension in Oenology (NEPE²); in 2014/2015 and 2015/2016 harvests. The treatments were: T1 – control; T2 – Defoliation in thenorth; T3 – Defoliation in the south and; T4 – Defoliation South and North. The response variables were analyzed by infrared spectrometry fourier transform (FTIR); these analyzes in the must were: total soluble solids (TSS) in ^∘Brix, pH, potassium and gluconic acid. The experimental design was a randomized block design with four replications and 20 plants per plot. The results were submitted to analysis of variance (F test) and multiple comparison of averages by Tukey test at 5% probability. TSS is kept equal in the 2014/15 crop, but in the 2015/16 season were different and the treatment T4 (Defoliation North and South); significantly higher, followed by treatment T3 (Defoliation to the south).