Banca de DEFESA: RAUL SANTOS ROCHA DE ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAUL SANTOS ROCHA DE ARAÚJO
DATE: 02/08/2023
TIME: 09:00
LOCAL: Auditório do PPG em Ciência do Solo
TITLE:

Citric acid and mineral or organic fertilization effects on the Ni, Cr and Co accumulation by Berkheya coddii

KEY WORDS:

Phytomining; hyperaccumulator plants; precious metals; fertilizing; chelating agents.

PAGES: 80
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Química do Solo
SUMMARY:

Ultramafic soils are formed from weathering rocks rich in ferromagnesian minerals and with a low silica concentration. These soils have high levels of magnesium (Mg), iron (Fe), manganese (Mn), and potentially toxic metals such as nickel (Ni), cobalt (Co), and chromium (Cr). Due to nutrient impoverishment, ultramafic soils are unsuitable for agriculture; however, some plants adapted to these soils, called hyperaccumulators, accumulate high Ni concentrations in their tissues. The agromining technique uses these plants to obtain biominerals by incinerating their aerial parts. An example of a Ni hyperaccumulator plant is the South African species Berkheya coddii, which has high biomass and a high Ni concentration in leaves. This study aimed to i) investigate the effects of citric acid application on Ni solubilization in ultramafic soil and its accumulation in B. coddii and ii) evaluate the biomass production and Ni accumulation in this species in response to applying mineral (NPK) and organic (bovine manure and sewage sludge biochar) fertilizers. The results showed that citric acid application affected the biogeochemical dynamics of the soil-plant system, increasing the metal bioavailability in the soil and the extraction, translocation, and accumulation of Co, Mn, and Fe by B. coddii. On the other hand, citric acid did not significantly increase the Ni content in the aerial part of the plants. Mineral fertilization and manure considerably increased plant biomass but negatively affected shoots' Ni content. Applying biochar did not affect the biomass production of the plants or the Ni content accumulated in the aerial part.

COMMITTEE MEMBERS:
Presidente - CLISTENES WILLIAMS ARAUJO DO NASCIMENTO
Externo à Instituição - ALFREDO ALVAREZ MONTERO
Externa à Instituição - ADRIANA ALVES BATISTA DE SOUZA