Leaf Temperature and Transpiration of Pequi Trees With and Without Water Restriction

Abstract

The answers to when and how much to irrigate orchards can be obtained based on the measurements of plants' transpiration and leaf temperature. This study aims to determine the leaf temperature and sap flow of the pequi tree (Caryocar brasiliense Camb.), both with and without water restriction. Further, the leaf temperature was measured by infrared thermometry and estimated transpiration using the Granier method, where the thermal dissipation probes are inserted into the plant stems. The experiment was conducted in a 120-plant orchard located in Goiânia-GO, Brazil, from which seven of the plants (3 irrigated and 4 non-irrigated; aged 6.6-7.4 years) were evaluated for eight months (October 2015 to May 2016). The soil was characterized as a dystrophic red latosol, and its water content was determined using the EC-5 capacitance sensors. The results denoted that the leaf temperature of the irrigated plants was lower than the median air temperature during summer and the transition period into the dry season, and the non-irrigated plants exhibited shortage of water availability during the dry season. In dryland conditions, the average transpiration was 24.09 L plant −1 day −1 and, when irrigated, became 42.29 L plant −1 day −1 .

MOISTURE LIMITS AND POTASSIUM CONCENTRATIONS IN THE SOIL SOLUTION FOR CULTIVATION OF LISIANTHUS (Eustoma grandiflorum) FERTIGATED UNDER PROTECTED ENVIRONMENT CONDITIONS

“…The second possible explanation may be related to the higher potassium concentration available to the plant, which can become more efficient in photosynthetic processes, not requiring a large leaf surface. Costa et al (2018) and Miranda et al (2019) reported that leaf area values are just large enough to be able to transfer excess sensible energy into latent heat via leaf transpiration, in combination with a well-developed root system and correctly supplied with water, would help to maintain high leaf transpiration rates.…”

Meio Ambiente, Sustentabilidade e Tecnologia – Volume 7

“…Cerrado, the Brazilian Savannah, is characterized by acid soils that exhibit low natural fertility and highwater deficit throughout the dry season, which occurs between May and September. Therefore, native plants have evolved to develop mechanisms of adaptation to water deficit conditions (Miranda et al, 2019). Caryocar brasiliense is a specie with slow development and a tree protected under federal law in Brazil.…”