Banca de DEFESA: PAULO HENRIQUE RIBEIRO MARQUES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULO HENRIQUE RIBEIRO MARQUES
DATE: 31/07/2024
TIME: 09:00
LOCAL: Auditório
TITLE:

Structural condition of soils under the cultivation of Coffea arabica L. in agroforestry and conventional systems

KEY WORDS:

Soil temperature. Soil porosity. Soil physics. Sensory attributes. Bioactives. Chromatic parameters.

PAGES: 82
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Física do Solo
SUMMARY:

Coffee culture is an essential element of Brazilian history and economy. Brazil is the largest coffee producer in the world and the cultivation of the bean is widespread in several regions of the country. However, agricultural production, not only coffee but for all agriculture, both for large rural producers and for those who work in family farming, depends on the quality of the soil. This is often quantified through its attributes, emphasizing physical, chemical, and biological attributes. In cultivation of Coffea sp. Conventional management is more common. On the other hand, agroforestry management favors the colonization of plants by arbuscular mycorrhizal fungi, promoting greater sustainability of the coffee agroecosystem. The objective of this study was to evaluate changes in the structural quality of soils under coffee cultivation under two management conditions: conventional and agroforestry in Miracica - Garanhuns - Pernambuco. The research sought to understand whether the type of management changes the structural quality of the soil and whether this has an influence on the quality of the coffee. In this way, we delimited two experimental areas under coffee cultivation, one area where coffee is grown conventionally in full sun, and another area where coffee is grown in shade, in the agroforestry system. In each area. soil samples were collected: in 20 × 20 × 20 cm blocks with preserved structure, samples in core of approximately 100 cm³ were taken using a Uhland-type sampler, and unstructured soil samples (without preserved structure) using a dutch-type auger. These samples were properly packaged and protected in bubble wrap and transported to the Soil Physics Laboratory at UFRPE. After preparing the samples, tests were carried out to characterize the soils in the areas under arabica coffee cultivation, taking into account the physical attributes of the soil: the distribution of particle size fractions, clay dispersed in water, calculation of the degree of flocculation; soil density and particle density; total porosity and its distribution into pore classes; tensile strength of soil aggregates; soil resistance to root penetration (RP); gravimetric humidity at the time of RP data collection (U_RP); aggregate stability indices; in addition to saturated hydraulic conductivity (Ksat) and soil temperature. As for chemical attributes, the following were determined: pH (H₂O), assortative complex; total organic carbon and organic matter to characterize soils under Arabica coffee cultivation. Trials, physical-chemical analyses of coffee, and tests were also carried out to identify the sensorial profile of coffee with beans obtained from coffee trees grown in each system and the interference of the agroforestry and conventional management system on the physical-chemical characteristics and chromatic parameters of coffee. The results showed that some physical attributes of the soil are more affected according to the management system used, such as saturated hydraulic conductivity (Ksat), which was higher in the agroforestry system compared to the conventional system, as well as humidity (U_RP). The soil temperature was higher for the conventional system, as was its thermal amplitude. It was also possible to identify differences between the sensory attributes of coffees which, despite being the same variety and grown in the same soil class, in nearby areas (≈100 m), had different evaluations, being different in the management system used in coffee cultivation.

COMMITTEE MEMBERS:
Presidente - BRIVALDO GOMES DE ALMEIDA
Interno - ADEMIR DE OLIVEIRA FERREIRA
Externa ao Programa - 1633668 - LUCIANA LEITE DE ANDRADE LIMA ARRUDA - UFRPE