Banca de DEFESA: MANOEL GOMES PESSOA JUNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MANOEL GOMES PESSOA JUNIOR
DATA : 02/03/2026
HORA: 08:00
LOCAL: Sala de vídeo conferência - Unidade 01 - UNEMAT - Alta Floresta
TÍTULO:

Chemical Fractions of soil organic matter under different land uses in Southern Amazonia.

PALAVRAS-CHAVES:

Humic fractions Organic matter Organic carbon

PÁGINAS: 60
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Química do Solo
RESUMO:

The objective of the work was to chemically fractionate the organic matter of the soil in different integrated production area systems. Soil samples were collected in six different land use systems, namely: (FN - native forest), (TIP - intensive pasture finishing), (ROT - rotational management system), (SAF - Agroforestry System), (ILP - crop-livestock integration), (SP - soybean pasture). These management systems are implemented at the Technological Reference Unit (ILPF) at Fazenda Gamada, Embrapa (URT) Nova Canaã do Norte – MT. The samples were collected in the year 2024, with seven soil samples taken from six different areas at a soil depth of 0–0.05 cm. With the collected samples, determinations of the total organic carbon content of the soil (TOC) were carried out, as well as the chemical fractionation of organic matter, separating it into three fractions: fulvic acids (FA), humic acids (HA), and humin (HUM). Thus, the contents, stocks, and variations in the C stocks of the three different humic fractions of soil organic matter were determined. The areas that showed the highest total organic carbon (TOC) values were ROT - rotational grazing systems, FN - native forest, and TIP - intensive pasture finishing (40.75, 39.03, and 32.39 TOC, respectively). The ILP - crop-livestock integration and SAF - Agroforestry System systems showed similar and acceptable values, while SP - soybean-pasture showed the lowest total organic carbon value. The FA fraction content showed, respectively, the highest values in the ROT - rotational grazing system and the SAF - Agroforestry System system (9.08 and 5.86 g kg⁻¹). And not differing from the other systems, the lowest value for this fraction in the SP- soybean pasture system, the levels of the AH fraction were higher in the ILP- crop-livestock integration and ROT- rotational grazing system (6.28 and 6.14 g kg⁻¹), where the values were respectively significant between the systems and did not differ from the others, with the lowest value observed in SP- soybean pasture. There was a predominance of HUM acid fraction levels in all management systems, with ROT- rotational grazing system (12.10 kg⁻¹) showing the highest levels and carbon stocks of this fraction. The ROT- rotational grazing systems demonstrated greater efficiency in maintaining total soil C and chemical fraction contents when compared to SP- soybean pasture. Permanent pasture systems, when well managed, can improve soil quality, presenting the highest levels of total organic carbon (TOC) and stocks of soil chemical fractions.

MEMBROS DA BANCA:
Presidente - 006.844.991-77 - GUILHERME FERREIRA FERBONINK - NÃO INFORMADO
Interno - 210865003 - GUSTAVO CAIONE
Externo à Instituição - 707.095.991-53 - CLEITON GREDSON SABIN BENETT - UEG