Banca de QUALIFICAÇÃO: BERNARDO FERNANDES FOGEL

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : BERNARDO FERNANDES FOGEL
DATE: 12/05/2026
TIME: 09:00
LOCAL: Embrapa Agrobiologia
TITLE:

Evidence of the effects of Gongocompound on different stages of vegetable crop development.

KEY WORDS:

Gongocomposting, Substrates, Polyamines.

PAGES: 30
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SUMMARY:

The management of diplopods through millipede composting (“gongocomposting”) has been employed as a viable technology for transforming lignocellulosic plant residues into stable organic matter, known as gongocompost, an agricultural input capable of being used as a high-quality substrate for vegetable seedling production. Empirical observations and reports from partner farmers suggest a possible beneficial effect of gongocompost on different stages of crop cultivation, such as seed germination, seedling emergence, and seedling development. These effects are often associated with physiological phenomena mediated by plant hormones, as has already been widely described for the bioactivity of humic substances in vermicomposts, but they may also result from microbial activity, since gongocomposts have already been described as being abundantly colonized by plant growth-promoting bacteria. In plants, physiological alterations of a hormonal nature are related to the occurrence of low molecular weight aliphatic substances, such as polyamines, which act as plant growth regulators in the maintenance and stimulation of several vital physiological processes and can be found in all living organisms. The objective of this study is to gather evidence of the positive effects of gongocompost at different stages of plant development in vegetable crops, analyzing whether these phenomena are related to differential levels of polyamines as a function of the substrate used, with the aim of verifying whether gongocompost is, in fact, capable of promoting changes in plant physiology. The agronomic performance of gongocompost is compared with different substrates derived from vermicomposting (SIPA), traditional composting (Organsolo), and commercial products (Carolina Soil and Biomix). Four vegetable species are tested: lettuce (Lactuca sativa L.), arugula (Eruca sativa), cucumber (Cucumis sativus L.), and eggplant (Solanum melongena). Emergence tests demonstrate that gongocomposts presented significantly lower mean emergence times than SIPA and Organsolo, regardless of the crop species. Gongocomposts also showed comparatively high levels of N and Ca. In general, plants cultivated in gongocomposts stood out in terms of root characteristics, such as root volume, root length, and surface area, as well as shoot biomass accumulation. Ongoing experiments will determine the polyamine levels present in the biomass of vegetable seedlings cultivated in their respective substrates, acting as a molecular marker of physiological changes, which will then be correlated with the observed effects in the emergence and seedling development assays.

COMMITTEE MEMBERS:
Interna - 1740899 - ERIKA FLAVIA MACHADO PINHEIRO
Externo à Instituição - JOSÉ GUILHERME MARINHO GUERRA
Interno - 2626406 - LEANDRO AZEVEDO SANTOS
Presidente - ***.320.637-** - MARIA ELIZABETH FERNANDES CORREIA - EMBRAPA