Banca de DEFESA: JOSÉVALDO RIBEIRO SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSÉVALDO RIBEIRO SILVA
DATE: 26/06/2023
TIME: 14:00
LOCAL: Auditório do PPG em Ciência do Solo
TITLE:

INFLUENCE OF SOIL CHARACTERISTICS AND MINERAL COMPOSITION OF PLANTS ON CANOPY REFLECTANCE OF GRAPES IN THE SEMIARID REGION OF BRAZIL

KEY WORDS:

Vitis vinifera. Remote sensing. Unmanned aerial vehicle. Nutritional diagnosis. Fertilization. Plant nutrition.

PAGES: 116
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

The main table grape producing region in Brazil is the sub-medium of the São Francisco River Valley, located in the semi-arid region of the Northeast, with approximately 10,807 hectares cultivated with vines. Problems such as the lack of continuous monitoring of soil chemical characteristics threaten the sustainable development of the activity in the region. The aim of our work was to evaluate, using remote sensing data, the spectral signature of table grape cultivars and their relationship with nutrient content in the soil and leaves. The grape cultivars (Vitis vinifera) Arra15®, BRS Vitória and Cotton Candy® were studied. In 270 soil samples (0-20 cm) pH, N, P, K, Ca, Mg, organic matter (OM), H+Al, Fe, Mn, Zn and Cu were determined and the cation exchange capacity calculated (CTC), the sum of bases (SB) and the base saturation (V). The same amount of leaf sample was collected for determination of nutrients (N, P, K, Ca, Mg, MO, Fe, Mn, Zn and Cu). Kriging was used to evaluate the spatial variability of nutrients in the soil. From spectral data were generated the Normalized Difference Green Vegetation Index (GNDVI), the Reflectance Modified Chlorophyll Absorption Index (MCARI), the Normalized Difference Vegetation Index (NDVI), the Soil Adjusted Vegetation Index (SAVI) and the Transformed Vegetation Index (TVI) of the cultivars. In all areas, P, K, Ca, Mg, Fe, Mn, Zn and Cu showed levels above the critical level for soil fertility, suggesting excesses in fertilization. Soil attributes showed weak to moderate spatial dependence. Excessive levels of N, P and Cu and deficient levels of K, Ca, Zn and Mn were observed in all cultivars. There was a relationship between P in Arra 15® and TVI (r² = 0,31), while for Cotton Candy®, NDVI and SAVI showed the same efficiency (r² = 0,10). In cultivar BRS Vitória, NDVI and GNDVI were related to N (r² = 0.24) and Cu (r² = 0,27), respectively. The NDVI was related to the OM and CTC contents with r² above 0.15. The results showed a low predictive capacity of the vegetation indices in the determination of nutrients in the soil and in the plant, however, due to their significance, they indicated potential use in nutritional management in viticulture, requiring additional studies to better understand the relationships between these variables

COMMITTEE MEMBERS:
Presidente - CLISTENES WILLIAMS ARAUJO DO NASCIMENTO
Externa ao Programa - 3159558 - AMELIA LAISY DO NASCIMENTO - UFRPEExterno ao Programa - ***.127.174-** - FERNANDO BRUNO VIEIRA DA SILVA - UFRPE
Externo à Instituição - LEILSON COSTA GRANJEIRO - UFERSA
Externo à Instituição - DAVI JOSÉ SILVA - EMBRAPA