Banca de DEFESA: JOABE WEBER PITZ

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOABE WEBER PITZ
DATE: 05/04/2024
TIME: 08:00
LOCAL: Auditorio - Estação Experimental de Ituporanga - Ituporanga - SC
TITLE:

Characterization of onion post-harvest processing residue and its agricultural use in eucalyptus areas.

KEY WORDS:

residue 1; onion skinn 2; natural decomposition 3; fertility 4

PAGES: 45
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

All human activities invariably lead to the production of waste, reflecting an intrinsic phenomenon in our interaction with the environment. In agriculture, this reality is no different, with one of the main waste-generating activities involving the harvesting and processing of agricultural products. The onion (Allium cepa) is a globally cultivated species, and the state of Santa Catarina stands out as the largest onion producer in the country, with a production of 551,540 tons in the 2022/2023 harvest on an area of 17,910 hectares. The Alto Vale do Itajaí region, in its onion micro-region, concentrates 75.87% of onion bulb production in the state of Santa Catarina and has the capacity to supply onions to the national market for approximately 6 months of the year. For commercialization and compliance with market standards, these onions bulbs undergo mechanical processing and classification. This involves the removal of adhered soil from the root system, cutting of the still-attached pseudostem, and removal of loose outer layers, resulting in the generation of the main agricultural waste from onion cultivation. The management of this waste has been neglected, turning it into an environmental liability to the production process and society. In this context, the objective was to evaluate the chemical and physical characteristics of onion processing waste for future use as organic fertilizer. The methodology employed in this work was divided into two formats to meet the objectives of quantitatively assessing the waste, determining doses, and evaluating the nutritional enhancement of its use in eucalyptus cultivation soil (Eucalyptus sp.). Initially, individual samples of waste were obtained from different locations, generating a composite sample. Laboratory analysis determined the average density, dry matter, moisture, carbon: nitrogen ratio, organic carbon, and nutritional content. Based on this information, waste doses were determined to implement the field experiment. It was observed that with increasing doses, both macro and micronutrients generally showed a positive evolution in their concentrations in the soil. Fertility indicators such as pH, CTC pH7.0, base sum, and saturation also showed improvement. Mineralization occurred in 173 days through the natural decomposition process without apparent environmental impacts. In conclusion, the results show that the onion processing waste has a sufficient nitrogen source for natural decomposition and supports the residue's mineralization process. It can be considered an interesting source of carbon for the soil, fostering the growth of soil microbiota and resulting in environmental gains.

COMMITTEE MEMBERS:
Externo à Instituição - FÁBIO SATOSHI HIGASHIKAWA - EPAGRI
Externo à Instituição - CLAUDINEI KURTZ - EPAGRI
Presidente - 2277446 - FABRICIO MOREIRA SOBREIRA