Phenological variations of avocado cv. Hass and their relationship with thermal time under tropical conditions

Joaquín Guillermo Ramírez-Gil; Juan Camilo Henao-Rojas; Cipriano Arturo Diaz-Diez; Andrés Javier Peña-Quiñones; Nicolas León; Alfonso Parra-Coronado; Jorge Alonso Bernal-Estrada

doi:10.1016/j.heliyon.2023.e19642

Phenological variations of avocado cv. Hass and their relationship with thermal time under tropical conditions

Heliyon. 2023 Sep 3;9(9):e19642. doi: 10.1016/j.heliyon.2023.e19642. eCollection 2023 Sep.

Authors

Joaquín Guillermo Ramírez-Gil^{1

2}, Juan Camilo Henao-Rojas³, Cipriano Arturo Diaz-Diez³, Andrés Javier Peña-Quiñones⁴, Nicolas León¹, Alfonso Parra-Coronado¹, Jorge Alonso Bernal-Estrada³

Affiliations

¹ Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias Agrarias, departamento de Agronomía, Bogotá 111321, Colombia.
² Laboratorio de Agrocomputación y Análisis Epidemiológico, Center of Excellence in Scientific Computing, Universidad Nacional de Colombia, Bogotá 111321, Colombia.
³ Corporación Colombiana de Investigación Agropecuaria, AGROSAVIA, Centro de Investigación La Selva, Colombia.
⁴ Corporación Colombiana de Investigación Agropecuaria, AGROSAVIA, Centro de Investigación La Libertad, Colombia.

Abstract

In recent years, the avocado has been one of the most dynamic fruits in the world market. In particular, cv. Hass stands out due to its productivity, nutritional quality, and acceptance. Under tropical conditions, weather elements, especially air temperature, and precipitation, affect the productivity and quality of cv. Hass. However, in tropical environments, many relationships between weather and phenological aspects of this cultivar are still unknown. Given this situation, our aim was to identify the variation and degree of association between the phenology of avocado cv. Hass and thermal time (TT) under low-latitude conditions. Eight commercial fields planted with cv. Hass grafted onto Antillean genotypes, located in an altitudinal transect between 1,700 and 2,500 m, were evaluated. The evaluation was carried out for three years and was focused on determining the differences in avocado phenological patterns associated with different environmental variables monitored by weather stations at each location. Air temperature data were used to calculate the base temperature (BT) using different methods for all phenological stages. Later the TT was determined for each stage and all locations. The results show that the duration of each phenological stage varies as a function of elevation (air temperature) and that the phenological stages overlap at the regional, crop field, and plant levels at different periods of the year, generating a high phenological variability but with specific patterns associated with temperature and precipitation. The BT for each phenological stage varied between 0.3 and 7.5 °C, and TT was found to vary depending on the method of calculation. Our work suggests that the generalization of a BT of 10 °C is not applicable for avocado cv. Hass crops under tropical conditions, specifically in the case of Colombia. Detailed studies of phenological relationships with respect to climatic variables will allow a better approximation of the productive behavior of avocado cv. Hass.

Keywords: Altitudinal profile; Base temperature; Growing degree days; Phenological variability.