Desenvolvimento de vinca (Catharanthus roseus) em condições de excesso e déficit hídrico

Abstract

The objective of this work was to identify the adequate management of subirrigation in root development and aerial part of Catharantus rouseus, to obtain the ideal blade for the Alegrete-RS region. The experiment was conducted in a greenhouse at the Federal University of Pampa, between January and April 2021, in Alegrete-RS. The experimente was bifactorial (4x3) in an entirely randomized design with four repetitions per treatment, totaling 48 experimental units. The first factor was the blade heights (15, 30, 45 and 60 cm), and the second factor was the times of subirrigation (3, 5, and 10 minutes). The seedlings were transplanted into plastic pots with a capacity of 0.91 L, filled with commercial substrate. The subirrigation was performed in plastic basins with 44cm diameter and 14.5cm height. Throughout the experiment, plant stature, leaf area, number of leaves, stem diameter and number of flowers were evaluated. At the end of the experiment, 12 randomly chosen plants were destroyed in order to analyze root growth and part area as a function of water consumption. The variables were submitted to variance analysis. Significant interaction between factors was observed, at 1% probability level, for the parameters plant height, number of leaves, number of flowers and stem diameter. The average daily water consumption was 5.52 mm.day-1. The highest Kc values occurred in the reproductive stage. Vinca obtained greater growth, development and productivity when subjected to a blade height of 45cm and subirrigation time of 5 minutes.