Abstract
BACKGROUND: Studies about remote sensing have been performed approaching the
object response to radiation, in which soil and vegetation are most investigated in
agricultural science. OBJECTIVE: This study aimed to compare reflectance levels
from Eucalyptus grandis Hill ex Maiden leaves through spectral measures in population
with two ages. MATERIAL AND METHODS: Trial was carried out at FEPAGRO
experimental plot, located in Santa Maria – RS. Experimental design was completely
randomized with population in two ages as treatment (44 and 20 mo) in which were
evaluated in North, Center, East, West and South direction. The FieldSpec®3
spectrophotometer was used to estimate the reflected radiance from adaxial surface of
leaves in three spectra, visible spectrum (VS, 400-700 µm), near infrared (NIR, 700-
1000 µm) and mid infrared (MIR, 1000-1250 µm). Kruskall-Wallis test was applied
using R statistical software. RESULTS: For VS, in 550 µm was observed a reflectance
peak associated to total chlorophyll content of leaf, in which the 44-mo population had
the highest peak. For NIR and MIR, the Center, North and West directions had the
greatest leaf reflectance in 44-mo population. Reflectance tends to the same response
through the wavelength of VS, NIR and MIR. CONCLUSION: The response of VS
from Eucalyptus grandis Hill ex Maiden leaves is different regarding the plant age and
different directions of sample collection. The NIR and MIR spectrum have no
reflectance standard response regarding the population ages.
Spectroradiometry from Eucalyptus grandis W. Hill ex Maiden population with different ages
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