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Costa, Jéfferson De Oliveira; Coelho, Rubens Duarte; Barros, Timóteo Herculino Da Silva; Fraga Júnior, Eusímio Felisbino; Fernandes, André Luís Teixeira

Canopy thermal response to water deficit of coffee plants under drip irrigation

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  • Medientyp: E-Artikel
  • Titel: Canopy thermal response to water deficit of coffee plants under drip irrigation
  • Beteiligte: Costa, Jéfferson De Oliveira; Coelho, Rubens Duarte; Barros, Timóteo Herculino Da Silva; Fraga Júnior, Eusímio Felisbino; Fernandes, André Luís Teixeira
  • Erschienen: Wiley, 2020
  • Erschienen in: Irrigation and Drainage
  • Sprache: Englisch
  • DOI: 10.1002/ird.2429
  • ISSN: 1531-0353; 1531-0361
  • Schlagwörter: Soil Science ; Agronomy and Crop Science
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>Abstract</jats:title><jats:p>To quantify water stress on coffee trees, leaf water potential (LWP) measurements are commonly performed in a Scholander chamber; however, this methodology is restricted to research activities, due to the difficulty of measurement in the field: sampling hours at predawn and intensive work. A crop water stress index (CWSI) based on leaf temperature has been used as indicative of LWP in several crops, and thermal images can be a precious tool for mapping LWP under intensive drip‐irrigated coffee areas, in order to adjust irrigation requirements according to soil moisture spatial variability. This study aims to define the relationships between the water potential of coffee leaf based on CWSI, calculated by means of a portable infrared sensor and a thermal camera, analysing correlation, precision and accuracy indexes. The study was conducted in Piracicaba, SP, Brazil, using <jats:styled-content style="fixed-case"><jats:italic>Coffea arabica</jats:italic></jats:styled-content> species of the Catuaí Red variety IAC 144 that was drip irrigated using tensiometers as matric potential sensors. The observed CWSI and LWP presented good correlations in the linear and cubic models. It was concluded that the CWSI is a good indicator of the water potential of a coffee canopy and can be an alternative to measurements of LWP from the Scholander chamber. © 2020 John Wiley &amp; Sons, Ltd.</jats:p>