TITLE:
Combined Radiometric Analysis Related to Guava Leaf Phenology in Response to Soil Application of Paclobutrazol (PBZ)
AUTHORS:
Victor Manuel Rodríguez-Moreno, Victor Manuel Rodríguez-Moreno, José Saúl Padilla-Ramírez, Guillermo Medina-García, Arturo Reyes-González
KEYWORDS:
Radiometric Indices, PBZ, Guava, High-Density Plantation, Climate Change
JOURNAL NAME:
International Journal of Geosciences,
Vol.13 No.8,
August
30,
2022
ABSTRACT: The leaf-response to three-soil
applied treatments of Paclobutrazol (PBZ; 1000, 2000 and 0 ppm-control) was
studied in a high-density plantation of eight guava (Psidium guajava) genotypes trees. All
materials were prunned in vase form, with two
to three major branches, yearly prunning for triggering the annual production
cycle, and average height of 2.0 m. The dataset comprises fourth radiometric
indices highly related to plant physiological activities. The dataset model
took into account data collection dates, guava genotypes, and the positional
effect of sun radiation on leaves based on their proximity to the canopy level
and downward to the base of the woody seasonal-branch. Unexpectedly, there were
no significant differences (NS) in PBZ treatments for genotypes, leaf position
and radiometric indices. Analysis of the radiometric indices data revealed that
anthocyanin (ARI index) and chlorophyll (PRI index) have a strong inverse
relationship. Significant differences (P ≤ 0.05) were found between guava
genotypes, and anthocyanin content; these results show that guava genotypes
have varied responses, which could derive in their classification based-on
drought resistance or low water requirements, however, it is important to note
that additional research is required to determine the scope of these
indications.