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

Autor(es)

Costa, Jefferson De Oliveira ^[1] ; Coelho, Rubens Duarte ^[1] ; Barros, Timoteo Herculino Da Silva ^[1] ; Fraga Junior, Eusimio Felisbino ^[2] ; Fernandes, Andre Luis Teixeira ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, ESALQ, Biosyst Engn Dept, CP 09, BR-13418900 Piracicaba, SP - Brazil

^[2] Fed Univ Uberlandia UFU, Univ Campus Monte Carmelo, Monte Carmelo, MG - Brazil

^[3] Univ Uberaba UNIUBE, Prorectory Res Grad & Extens, Uberaba, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: IRRIGATION AND DRAINAGE; v. 69, n. 3 MAR 2020.
• Citações Web of Science: 3

Resumo

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 Coffea arabica species of the Catuai 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. (c) 2020 John Wiley \& Sons, Ltd. (AU)

• Processo FAPESP: 12/50083-7 - Produtividade da água em biomassa e energia para variedades de cana-de-açúcar em função da disponibilidade hídrica no solo: experimentação e simulação
• Beneficiário: Rubens Duarte Coelho
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - PITE