Banca de DEFESA: NATÁLIA BATISTA DO NASCIMENTO SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NATÁLIA BATISTA DO NASCIMENTO SILVA
DATE: 24/02/2022
TIME: 09:00
LOCAL: meet.google.com/qxr-rfpu-gkv
TITLE:

Soil penetration resistance in soils cultivated with sugar cane in the forest zone area of Pernambuco: relationships between field and laboratory data).

KEY WORDS:

Compaction, soil quality, penetrometry.

PAGES: 64
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Sugarcane is one of the main crops in the Brazilian economy and the productivity is related to the production environment. However, this environment has been frequently changed, due to the intense use of heavy machinery that promotes soil compaction and, consequently, the degradation of physical conditions. This degradation has been evaluated using some soil physical attributes, with greater emphasis on soil penetration resistance (PR). However, there are doubts about the type of test and the methodological limits that can be used to better diagnose the structural quality of soils. Thus, this study aimed to use PR to diagnose structural changes in soils cultivated with sugarcane, from field and laboratory methods, comparing their results as a function of soil moisture and its influence on the critical of soil resistance to root penetration value (2 MPa), defining the relationships between field and laboratory methods. Therefore, at the Carpina Sugarcane Experimental Station, located in the Zona da Mata region of Pernambuco, three sub-areas were selected based on the classification of soils and textural classes to determinate PR in situ by field penetrometer, associated with the respective soil moisture. At the same time, soil samples with preserved structure (volumetric cores @100 cm³) were collected for the PR tests in the laboratory, via an electronic benchtop penetrometer. The data obtained by the PR tests (field and laboratory) were used to generate the equations for estimating the PR, using physical-hydric attributes to evaluate their influence on the PR values. Thus, the following attributes were determined: particle size distribution (hydrometer method); bulk density (volumetric cylinder); total porosity (saturation) and pore size distribution (tension table); saturated hydraulic conductivity (constant load permeameter), in addition to gravimetric and volumetric soil water content. The results showed that PR values, both in field and laboratory, are useful for diagnosing degraded areas. The equations for RP simulation are efficient to estimate degrees of degradation of the studied soils. The sand and clay, macropores and Ksat were the attributes that presented the highest correlations with the results.

BANKING MEMBERS:
Presidente - 6383037 - BRIVALDO GOMES DE ALMEIDA
Externo à Instituição - BRUNO CAMPOS MANTOVANELLI
Interno - 385000 - FERNANDO CARTAXO ROLIM NETO