Banca de DEFESA: ANTONINO JOSÉ JACQUES GAMBÔA FERNANDEZ DE OLIVEIRA NETTO
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : ANTONINO JOSÉ JACQUES GAMBÔA FERNANDEZ DE OLIVEIRA NETTO
DATE: 05/03/2024
TIME: 09:00
LOCAL: Sala 24 do Departamento de Solos
TITLE:
Diversified agricultural production systems in the Cerrado region of Goiás: Using edaphic attributes to assess land quality.
KEY WORDS:
Organic carbon; forms of land use; soil conservation; fertility; organic fractions.
PAGES: 94
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:
Different forms of land use can promote diferent changes in soil fertility and the dynamics of soil organic matter (SOM), especially in environmental and soil conditions that favor and intensify the transformation of organic material. The objectives of this study were i) to evaluate the chemical attributes related to soil fertility in areas subjected to different land use and management systems; ii) to analyze the impact of more diversified production systems on maintaining and/or improving the fertility levels of these areas; and iii) to evaluate the impact of different land use and management systems on the interactions between the fractions of MOS in agricultural areas in the Cerrado Goiano. The study was carried out in three areas of the biome, under diversified production systems: 1) BV area - soybean monoculture (MS01); crop-livestock-forest integration (ILPF01); pasture (PA01); and Cerrado vegetation (VC01); 2) ML area - monoculture with soybean/maize succession (SSM02); agroforestry (AF02); pasture (PA02); and Cerrado vegetation (VC02); and 3) Area IF - soybean/maize succession (SSM03); livestock-forest integration (IPF03); pasture (PA03); and Cerrado vegetation (VC03). Deformed and undeformed soil samples were collected from the 0-5, 5-10, 10-20 and 20-40 cm layers. The samples were air-dried, crumbled and passed through a 2.00 mm mesh sieve to obtain fine air-dry soil (FADS), the material used for the analysis. The soil fertility characterization analyses were carried out (pH in H2O; Ca2+; Mg2+; Al3+; H+Al; Na+; K+ and P), the soil sorption complex value was also calculated, and the MOS compartments were assessed using the following analyses: total organic carbon (TOC), TOC stock (ESTC) and the fractionations of the MOS: physical granulometric (particulate organic carbon, COp; and associated with minerals, Coam), physical densimetric (carbon of the free light fraction, FLL) and chemical of the humic substances (fulvic acid fraction, FAF; humic acid, FAH; and humin, HUM). The content of light organic matter in water (MOL) and the carbon management index (CMI) and its components were determined. The PA01, AF02 and PA03 systems showed the best results in terms of chemical attributes, including the highest pH, Ca2+, Mg2+, K+, P, SB and V% values, as well as the lowest H+Al and Al values. On the other hand, the use systems used as a reference, VC02 and VC03, showed the highest values of active, exchangeable and potential acidity. In the different types of systems used, fertilization led to an increase in nutrient levels in parallel with a decrease in toxic elements. In addition, the maintenance of crop residues, as well as the use of forage plants for greater soil cover, also contribute to improving soil fertility. The most recalcitrant MOS fractions (COam and HUM) were the ones that contributed most to separating the systems in the PCA. The MOS fractions were similarly affected by the characteristics of the land use systems. MOL was the MOS fraction most effective in demonstrating the influence of diversified production systems.
COMMITTEE MEMBERS:
Presidente - 1060711 - MARCOS GERVASIO PEREIRA
Externo ao Programa - 2136627 - NIVALDO SCHULTZ - UFRRJExterno à Instituição - DAVID VILAS BOAS DE CAMPOS - EMBRAPA