Banca de DEFESA: PATRICIA MARIA CASÉ DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PATRICIA MARIA CASÉ DA SILVA
DATE: 13/05/2024
TIME: 14:00
LOCAL: Google Meet meet.google.com/jck-nzaa-ihn
TITLE:

POTENTIAL REUSE OF IN NATURA COFFEE GROUNDS AS SUBSTRATE IN AGRICULTURAL PRODUCTION OF LETTUCE AND ARABIC COFFEE SEEDLING

KEY WORDS:

Solid Waste, caffeine, toxicity and Bioindicators

PAGES: 94
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

One of the main wastes from coffee farming is coffee grounds, obtained after aqueous
extraction and rich in substances with toxic potential, such as caffeine. Generated in large
volumes in Brazil and around the world, coffee grounds are discarded uncontrollably in
landfills or dumps. Given the current scenario and given the importance of coffee in the
Brazilian economy, the present study aimed to identify viable compositions for reusing
fresh coffee grounds considering their possible toxic effects, isolated and in volumetric
combinations with commercial substrate, for agricultural production of seedlings. of
lettuce and coffee. Scientific production on the reuse of coffee grounds is still incipient
and little directed towards agricultural production based on the concept of circular
economy. The experiments were conducted in a completely randomized design with
treatments 0%, 25%, 50%, 75% and 100% of coffee grounds and substrate. The coffee
grounds were characterized for moisture, pH and caffeine content. To evaluate the toxicity
of caffeine in the soil, an escape test was carried out with earthworms of the species E.
fetida and phytotoxicity with seed incubation. To determine the best compound for
seedling production, bioassays were carried out with lettuce and coffee seeds. The
variables evaluated were the earthworm avoidance rate, the germination index and radicle
growth in the seeds, the % of germination, emergence speed, height, number of leaves and
weight of the fresh dry aerial part in the seedlings produced. The statistical treatment of
the data obtained made it possible to identify that at concentrations of 75% and 100%
there is inhibition of seed germination, a high avoidance rate and inhibitory results in the
production of seedlings. Concentrations of 25% and 50% demonstrated satisfactory results
for composing substrates for the production of coffee and lettuce seedlings.

COMMITTEE MEMBERS:
Externo ao Programa - 2491607 - JOSIMAR BENTO SIMPLICIO - UFRPEPresidente - ROSANGELA GOMES TAVARES
Interno - VICTOR CASIMIRO PISCOYA