Effect of deficit irrigation on Helianthus annuus L. plants in containers

• Jennifer Orejuela-Romero Group YASUNI-SDC, Escuela Superior Politécnica de Chimborazo, Sede Orellana https://orcid.org/0000-0002-5500-1612
• Juan Chipantiza-Masabanda Group Causana Yachay-Escuela Superior Politecnica de Chimborazo, Sede Orellana Ecuador. https://orcid.org/0000-0002-7005-9134
• Pablo Carrera-Oscullo Group YASUNI-SDC, Escuela Superior Politécnica de Chimborazo, Sede Orellana https://orcid.org/0000-0002-2515-7042
• Ana Salguero-Cajo Group Causana Yachay-Escuela Superior Politecnica de Chimborazo, Sede Orellana Ecuador https://orcid.org/0000-0001-8790-160X

Keywords: water stress, thermography, plant physiology

Abstract

In order to evaluate changes related to plant physiology, infrared thermography has been chosen as a non-invasive complement. The research objective was to analyze the effect of deficit irrigation on Helianthus annuus L. plants in containers by means of IR thermography in a controlled experimental population at the University of Seville. The experiment consisted of three irrigation treatments to sunflower plants; one treatment received full irrigation (C-100) and two treatments received deficit irrigation: 70 % (R-70) and 50 % (R-50). A randomized block design was used. In the initial stage, polystyrene seedling trays of 54 cells (square) were used for the cultivation of sunflowers. The dimension of the trays was 700 x 400 x 70 mm.  The cell size was 65 x 70 mm and the capacity was 135 cm³.   For the development stage, plastic pots with a capacity of 4 L and a dimension of 21 x 16.4 cm were used. The sunflower plants used in this study did not exhibit significant differences in temperature and physiological analyses as a function of the irrigation treatment applied. However, there was a strong tendency for the plants to better resist water stress under a restrictive irrigation of 70%.

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