Banca de DEFESA: LUARA GABRIELLA GOMES DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUARA GABRIELLA GOMES DE LIMA
DATE: 26/02/2026
TIME: 14:00
LOCAL: Auditório do PPG Ciência do Solo
TITLE:

Soil Health After Inoculation of Phosphate-Solubilizing Bacteria in Table Grape Cultivation in the São Francisco Valley

KEY WORDS:

Vitis vinifera. Phosphorus. Enzymatic activity. P solubilization.

PAGES: 84
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SUMMARY:

To meet global food demand and overcome the problem of phosphorus (P) fixation in soils, producers use excessive amounts of phosphate fertilizers. This generates great concern, as the overuse of these inputs can impact natural resources, such as the depletion of phosphate rocks. Viticulture plays an important role in the Brazilian economy, and the São Francisco Valley, located in the states of Bahia and Pernambuco, stands out in the production and export of the fruit and its derivatives. Thus, to maintain vineyard productivity, high doses of phosphate fertilizer are applied, which can result in environmental problems. In this context, Phosphorus-Solubilizing Bacteria (PSB) emerge as a viable and sustainable alternative to make the nutrient available in the soil and meet part of the plants' demand. However, the literature presents few studies focusing on soil health after PSB inoculation in the field, especially in table grape cultivation. Thus, this research aimed to evaluate soil health using chemical, biological, and enzymatic indicators after inoculation with BSP, isolated from soils of the Brazilian semi-arid region, in grape cultivation in the São Francisco Valley. The experiment was conducted on a commercial farm producing premium table grapes. The vines were inoculated with BSP first after drastic pruning, and a second inoculation was performed during the berry filling period. The factorial arrangement was 7 x 2 + 2, composed of seven types of BSP (PL1A, PL1B, LU10E, PL18E, PL1A+PL18E, PL1B+LU10E and the commercial product BiomaPhos®), two phosphorus doses (0% and 50% P), and two controls: an absolute control (without inoculation and fertilization) and a fertilized control (without inoculation and with 100% of the recommended dose). The experimental design was a randomized complete block design (RCBD) with four replications. At the end of the experiment, soil samples were collected at depths of 0-20 and 20-40 cm. Chemical (pH, available P, exchangeable K+, total N, and TOC), microbiological (RBS, CBM, PBM, qCO2, and qMIC), and enzymatic (alkaline phosphatase, beta-glucosidase, arylsulfatase, and urease) attributes were analyzed. The results showed that inoculations with BSP promoted increases in several attributes related to soil health. Available phosphorus in the fertilized control treatment showed a content of 213.31 mg kg⁻¹, while BSP LU10E showed 427 mg kg⁻¹ of available P with a 0% P dose; with a 50% P dose, 444.18 mg kg⁻¹ was obtained. Therefore, there were increases of 100.50% and 108.23%, respectively, with the inoculation of this bacterium. BSP PL18E, with 50% of the P dose, provided a CBM of 101.90 mg kg⁻¹ in the subsurface (20-40 cm), while the value of this same variable with the application of 100% of the recommended P dose was 31.50 mg kg⁻¹, representing an increase of 223.49%. Alkaline phosphatase enzyme activity was significantly improved with inoculations, mainly with the PL1B+LU10E consortium (50% P), which showed a value of 2907.66 μg p-nitrophenol g⁻¹ h⁻¹, while the 100% control showed 1122.83 μg p-nitrophenol g⁻¹ h⁻¹, an increase of 158.96%. It is concluded that the use of native BSP from the Brazilian semi-arid region is efficient in making phosphorus available and promotes improvements in soil health, in addition to enabling a 50% reduction in mineral phosphate fertilization in table grape cultivation in the São Francisco Valley.

COMMITTEE MEMBERS:
Presidente - GISELLE GOMES MONTEIRO FRACETTO
Externa à Instituição - CHRISTIANE ABREU DE OLIVEIRA PAIVA
Externa à Instituição - CLARISSA BUARQUE VIEIRA - UFRPE