Banca de DEFESA: JÚLIO CÉSAR RIBEIRO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JÚLIO CÉSAR RIBEIRO
DATA : 25/02/2019
HORA: 09:00
LOCAL: Anfiteatro Principal do PPGEA
TÍTULO:

Nutrients and heavy metals in soil and leafy vegetables grown in the municipality of Nova Friburgo-RJ.

PALAVRAS-CHAVES:

Mountain Region. Contamination. Lettuce. Parsley.

PÁGINAS: 129
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Fertilidade do Solo e Adubação
RESUMO:

RIBEIRO, Júlio César. Nutrients and heavy metals in soil and leafy vegetables grown in the municipality of Nova Friburgo-RJ. 135f. Thesis (Doctor in Agronomy, Soils Science). Institute of Agronomy, Department of Soils, Federal Rural University of Rio de Janeiro, Seropédica, RJ, 2019.

 

The mountain region of Rio de Janeiro is characterized by the great production of vegetables, being the main producing region of the state. However, poor management practices and high utilization of organic and mineral fertilizers have increased the risk of soil contamination and consequently of plants. The objective of this study was to evaluate fertility and contamination by heavy metals (Cu, Ni, Cd, Pb, Cr, Co and Zn) in soils cultivated with lettuce (Lactuca sativa L.) and parsley (Petrosolium sativum) in the Municipality of Nova Friburgo-RJ, identifying which factors contributed most to the enrichment of these elements in the soil and their transfers to the plants, as well as their quality based on the limits acceptable by ANVISA. The study was carried out in 32 family farms, 18 lettuce producers and 14 parsley producers, under which samples of soil and plants were collected. The soil was collected at two depths (0-20 and 20-40 cm), being digested according to the 3050B method (USEPA, 1996). The collected plants were separated into leaves and roots, being digested according to the method 3050 (USEPA, 2008). The heavy metals in the digested extracts were quantified by Atomic Absorption Spectrometry, and the quality of the soil and plant analyzes evaluated with NIST SRM 2709a and 1573a certified samples, respectively. In the soils cultivated with lettuce, the contents of Co, Zn and Cu are associated with the characteristics of the source material. However, the Pb, Cd and Ni contents are associated to a greater anthropogenic contribution, being Pb via organic fertilization and for Cd and Ni, via mineral fertilization. On average, the contamination index of the study area was classified as low contamination of the soil by metals, except for Cr, which indicated impoverishment and, Cd and Cu, which presented severe contamination. In general, areas with higher organic matter content and acidity (lower pH, higher H+Al and higher Al+3) showed higher bioavailability of metals and consequently higher absorption and extraction per hectare by lettuce plants. In these areas, 52,58% of the lettuce plants were contaminated with Pb. In Cu, Ni, Co, Pb and Zn, the soils are related to the geochemical character of the source material, as well as the presence of Zn is also associated with anthropogenic sources by means of mineral fertilization, and Pb is the mineral and organic fertilization. The pollution index for Cd and Cr is related to the anthropogenic source through mineral fertilization. On average, the contamination index of the study area presented impoverishment for Cr, low contamination for Ni, Pb, Zn and Co, and severely contaminated for Cd and Cu. In general, there was a higher bioavailability of metals in areas with higher organic matter content and acidity (lower pH, higher H+Al and higher Al+3) of the soil, with the plants having a higher absorption and extraction of metals. In these areas, 78,33% and 40% of the parsley plants presented contamination by Pb and Cd, respectively.

MEMBROS DA BANCA:
Externo à Instituição - DANIEL VIDAL PÉREZ - EMBRAPA
Externo ao Programa - 1412091 - ERICA SOUTO ABREU LIMA
Presidente - 2213075 - EVERALDO ZONTA
Externo à Instituição - FABIANA SOARES DOS SANTOS - UFF
Externo ao Programa - 2136627 - NIVALDO SCHULTZ