Banca de DEFESA: NELSON KEN NARUSAWA NAKAKOJI

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NELSON KEN NARUSAWA NAKAKOJI
DATE: 25/07/2023
TIME: 09:30
LOCAL: GOOGLE MEET
TITLE:

SPATIAL INTERPOLATION OF ALTIMETRY AND SOIL CHEMICAL, PHYSICAL AND BIOLOGICAL ATTRIBUTES ON THE INCIDENCE OF FATAL YELLOWING OF OIL PALM

KEY WORDS:

Elaeis guineensis Jacq.; FY; geostatistics; soil penetration resistance; soil
hypoxia.

PAGES: 78
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Defesa Fitossanitária
SUMMARY:

The palm oil (Dendê culture - Elaeis guineensis Jacq.) is one of most significant culture
for the state of Pará, being the main producing state in Brazil. However, one of the main
factors limiting the expansion of this culture in the region is the occurrence of a disease
named Fatal Yellowing of the oil palm (FY). In that context, this dissertation proposed
two analyses, (i) to evaluate the influence of soil penetration resistance (SPR) and digital
terrain model (DTM) on the incidence of Fatal Yellowing of the oil palm, (ii) to analyze
biological, chemical and granulometric attributes of the soil on the incidence of Fatal
Yellowing of the oil palm. The first analysis was carried out at Nogami Farm, located in
the municipality of Igarapé-Açu, in the state of Pará, in a 6.3 ha plantation. Through a
regular grid of 179 points and using a penetrometer and GNSS navigation, the maps of
SPR predictions and altimetric coordinates (DTM) were gauged and interpolated. After
this process and using the georeferenced phytosanitary inventory, the values of the RPS
and altimetric coordinates were extracted for each plant and two independent groups were
generated, plants WITH FY and plants WITHOUT FY. As data did not attend parametric
assumptions, the non-parametric Mann-Whitney test at 5% significance was used to
compare the groups. The investigation of SPR and DTM, demonstrated that the incidence
of FY occurs at locations where the SPR are more elevated and the terrain geometry is
favorable for the convergence and stagnation of water flow. The second analysis occurred
on the agricultural premises of the agro-industry Palmas S/A, another located in the
municipality of Igarapé-Açu, in a 12.77 ha plantation. Through a regular grid of 100
points, soil samples were collected for EMBRAPA's BioAs analysis, which encompasses
biological, chemical and granulometric attributes. Subsequently, the attributes were
interpolated by ordinary kriging to produce the prediction maps. The same way as the
previous evaluation, two independent groups were created (plants WITH FY and plants
WITHOUT FY), extracted the values of the predicted maps and submitted to the Mann-
Whitney test at 5% significance level. As results, the areas of FY incidence have higher
content of Clay, Magnesium (Mg) and Potassium (K), higher biological activity in the
period of drought (IQSBiological, F1 - nutrient cycling, high β-glucosidase and
Arylsulfatase) and lower content of available phosphorus (P). Generally speaking, these
conditions described in the two evaluations infer compacted sites, with water deposition
and drainage deficiency, generating soil hypoxia in the sites of FY incidence.

BANKING MEMBERS:
Presidente - 1356971 - PAULO ROBERTO SILVA FARIAS
Interna - 922.148.002-04 - EDNA SANTOS DE SOUZA - UFRA
Externo à Instituição - ARTUR VINICIUS FERREIRA DOS SANTOS - UFPA
Externo à Instituição - RICARDO SALLES TINÔCO - ACROTECH