Author(s): Paredes, Paula ; Petry, Mirta T. ; Oliveira, Cristina M. ; Montoya, Francisco ; López-Urrea, Ramón
Date: 2024
Persistent ID: http://hdl.handle.net/10400.5/102117
Origin: Repositório da Universidade de Lisboa
Subject(s): Climate models; Evapotranspiration; Orchards; Tropics
This paper provides an overview of the research carried out over the last 25 years on the FAO56 single and basal crop coeffi- cients of subtropical and tropical orchards and plantations of cactus pear, dragon fruit, fig, jujube, passion fruit, pomegranate, cape gooseberry, cherimoya, guava, longan, lychee, mango, papaya, acerola, carambola, cashew, cacao, coffee, jaboticaba, jatropha, macadamia, açai palm, coconut, date palm, guayule, oil palm, peach palm, ramie and rubber tree. The main objec- tive of this review is to update standard single crop coefficients (K c ) and basal crop coefficients (K cb ) and complete the K c and K cb values tabulated in FAO56. K c is the ratio between the non-stressed crop evapotranspiration (ETc ) and the grass reference evapotranspiration (ETo ), and K cb is the ratio between the crop transpiration (Tc ) and the ETo . When selecting and analysing the literature, only studies that used the FAO Penman–Monteith equation, or another equation well related to the former to compute ETo were considered, while ETc or Tc were obtained from accurate field measurements on crops under pristine (non-stress cropping conditions) or eustress (“good stress”) conditions. Articles meeting these conditions were selected to provide data for updating K c and K cb under standard conditions. The related description of orchards and planta- tions refers to crop cultivar and rootstock, irrigation systems and scheduling, planting spacing, fraction of ground cover (f c ) by the crops, crop height (h), crop age and training systems, as K c and K cb values depend on these characteristics. To define the standard K c and K cb values of the selected crops, the values collected in the literature were compared with previously tabulated standard K c and K cb values. The updated tabulated values are transferable to other locations and climates and can be used to calculate and model crop water requirements, primarily for irrigation planning and scheduling, and thereby sup- porting of improved water use and savings, which is the overall aim of the current review.
