Transpiration of irrigated apple trees and citrus from a water potential gradient approach in the leaf-atmosphere system

Abstract

The uptake of water from the roots of crops comes to being a physiological response of the plant to the water loss process through its stomata. Getting to know the daily transpiration rates throughout the phenological cycle allows for the application of the ideal amount of irrigation water at the right moment to maximize production with environmental protection. Since transpiration direct measurements at the field, mainly for trees in general, are to be of operational difficulty and relatively high cost we came up with a methodology that allows one to calculate the daily transpiration rates of apple trees and citrus orchards from variables of both the physical environment and the crop. The input data of the proposed model are air temperature, air relative humidity, photoperiod duration, and leaf area. Estimated transpiration rates based on the water potential gradient between the air and leaf approach were comparable in apple trees and citrus orchards. Sap flow daily values were obtained by means of the heat balance method at Bordeaux, France, and Piracicaba, SP, Brazil. All the coefficients of determination of the regression equations obtained herein were higher than 0.93. This allows one to calculate the amount of irrigation water to be applied throughout the crop growing seasons with a high precision as a function of meteorological data and crop covering density at the sites in the study.

Classification of recent studies by method type for surface air temperature map development and estimation of daily temperature using a radiative cooling scale

“…Such data are effectively applied in the cultivation of specific crops such as citrus fruits, for which it is desirable to manage individual trees (Maotani and Machida, 1977;Cohen and Fuchs, 1987;Pereira et al, 2011), and Japanese tea, about which there is frost damage concern (Suzuki et al, 1982).…”

Performance of Summer Greengram (Vigna radiate L.) under Various Orientations in Semi-arid Region, Haryana (India)

“…Singh et al (2020) showed that all the growth parameters, yield attributes and yield were significantly higher in the North-South sowing direction as compared to East-West. Net radiation is an essential key to assessing evapotranspiration and precise estimation for water resource management on a regional scale (Villa Nova et al, 2006;Ryu et al, 2008;Pereira et al, 2011). PAR absorption by canopy results in increased plants biomass and grain weight (Kooman and Haverkort, 1995;Shaykewich et al, 1998).…”

Validation study of an overall radiation balance estimation method under Ponta Grossa (PR) Brazil weather conditions

“…Apart from its intrinsic importance in energy balance studies, net radiation is a key input variable in climatological models to assess evapotranspiration, and its precise estimate is essential for water resource management on regional scale RYU et al, 2008;PEREIRA et al, 2009;PEREIRA et al, 2011), for frost prediction studies, and air pollution monitoring (FRITSCHEN & FRITSCHEN, 2007).…”