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

Abstract

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 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 & Sons, Ltd.

Use of organic fertilization with irrigation in coffee production in brazilian cerrado

“…Brazil already has 300,000 ha of irrigated coffee distributed in several states, predominantly in Minas Gerais, Espírito Santo and Bahia; it's around 15% of total area of coffee It is necessary to study the various coffee irrigation systems in detail and comparatively in order to make practical recommendations to coffee growers, both in the recovery of current plantations, and in the expansion of the Triângulo Mineiro's irrigated coffee cultivation (Santinato et al, 2008). The creation and adaptation of coffee production technologies under total and supplementary irrigation are essential in order to allow high continuous and economic productivity without environmental damage (Costa et al, 2020). Most of the experimental work on coffee irrigation shows increases of 20 to 30 bags produced per hectare, regardless of the systems used and depending on the region under study (Santinato and Fernandes, 2012).…”

Determining the Leaf Area Index and Percentage of Area Covered by Coffee Crops Using UAV RGB Images

“…Another non-destructive method is the use of cameras and sensors. Studies by [12], [13] using portable cameras and sensors achieved good results to estimate some coffee parameters. In addition, [13] state that it is also possible to estimate the spatial variability of the water potential of the coffee canopy using an aerial image.…”

“…Studies by [12], [13] using portable cameras and sensors achieved good results to estimate some coffee parameters. In addition, [13] state that it is also possible to estimate the spatial variability of the water potential of the coffee canopy using an aerial image. This opens up possibilities Determining the leaf area index and percentage of area covered by coffee crops using UAV RGB images T for studies using SfM-UAV in this culture.…”

Fator crítico de disponibilidade hídrica para o crescimento inicial do cafeeiro Conilon

“…Diversos estudos relatam, que o manejo da água quando efetuado de maneira equivocada, promove redução da água disponível no solo a limites críticos, estabelecendo a partir disto, sérias restrições no crescimento do cafeeiro, conforme apresentado por Oliveira, Pizetta e Reis (2012), Pizetta, Rodrigues, Ribeiro e Reis (2016), Rodrigues et al (2015), Costa et al (2018), Ribeiro et al (2019), Costa et al (2020).…”