Physiological Responses of Coffee Tree Under Different Irrigation Levels

Abstract

The plant water potential and the leaf temperature are physiological responses of the coffee tree that can be used as indicative of the irrigation management of this crop. There is a dependence between the leaf water potential with the potential matrix of the soil solution, however, the water potential levels found for the coffee tree show divergent relationships in the literature regarding the matrix potential. The objective of this study is to verify the water potential and leaf surface temperature in the coffee tree when submitted to different irrigation levels. The study was conducted in Piracicaba, SP, Brazil, using Coffea arabica species from Red Catuaí IAC 144 variety, the drip irrigation system was adopted and the management done by tensiometry. The relationships among these physiological responses and the treatments of actions presented high determination coefficients (R² of 0.84, 0.90 and 0.65 for the leaf water potential, leaf temperature measured with the portable infrared sensor and the thermal camera respectively). The estimated values for leaf water potential were-0.23,-0.56,-0.89 and-1.22 MPa for irrigation treatments L130%, L100%, L70% and L40%, respectively. The calculated leaf temperature values were 31.7, 32.4, 33.0 and 33.7°C in average, for treatments L130%, L100%, L70% and L40% in proper order.

Effect of water stress and Coffee ringspot virus on coffee leaf temperature and its relationship with Brevipalpus yothersi population

“…This is evidenced by the high amplitude values of the DWSI measurements. The expected effect would be a decrease in leaf temperature and DWSI with increasing water availability, as demonstrated by Mattson and Haack (1987), Costa, Grant and Chaves (2013) and Costa et al (2018).…”

Leaf area index and radiation extinction coefficient of a coffee canopy under variable drip irrigation levels

“…The greenhouse had a total area of 160 m² and was 3 m high, with a transparent 150 micron polyethylene film cover and closed sides covered by a "type screen with 30% interception. The structure was supplied with 56 containers (500 L each), and at the bottom of each container was a 5-cm-thick layer of gravel coated with a geotextile blanket (Costa, Almeida, Coelho, Folegatti, & José, 2015;Costa et al, 2018). The soil used inside the containers is classified as a eutrophic Red Nitosol, clay phase, called "Luiz de Queiroz Series".…”

“…The most visible effects of water stress are the reduction of plant size, leaf area and crop productivity. The degree of damage caused by the water deficit depends considerably on the phenological stage of the plant in which the stress occurs and on the duration of the stress (DaMatta & Ramalho, 2006;Silva et al, 2010;Costa et al, 2018).…”

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.…”

“…Used as an indirect and non-destructive method to estimate the LAI from the leaf volume and plant architecture, requiring only measurements of the height and radius of each plant and the row spacing [7]. According to [12], methods based on biometric relationships such as LA and volume as well as canopy area may be used to estimate coffee LAI with satisfactory accuracy. However, this method may be laborious, which may lead to measurement errors in the field, in addition to not representing the entire area because a limited sample is used to obtain the data.…”