Banca de QUALIFICAÇÃO: GABRIEL ALVES BOTELHO DE MELLO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : GABRIEL ALVES BOTELHO DE MELLO
DATE: 06/06/2023
TIME: 09:00
LOCAL: sala 24 do departamento de solos
TITLE:

Evaluation of N-Green organic fertilizer prototypes obtained by processing aerial biomass of Gliricidia sepium.

KEY WORDS:

Organic fertilizer; Plant biomass; Nitrogen.

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

The present doctoral qualification is related to the work entitled “Evaluation of the N-Green organic fertilizer prototypes obtained by processing the aerial biomass of Gliricidia sepium” which studies the application of different processes in the aerial biomass of gliricidia for the production of distinct N-green organic fertilizer prototypes. The objective of this work was to develop and evaluate the production of N-green organic fertilizer prototypes obtained by processing the aerial biomass of Gliricidia sepium, assessing its efficiency as a nitrogen fertilizer for crops of agronomic interest, as well as the multiple uses of the product from this processing.

To evidence and confirm the hypotheses of the present work, experiments are being developed. The main experiences that are being developed are the evaluation of the processing of gliricidia biomass via composting, observing the concentrations of macronutrients and mass loss during the composting time: Protocols´development for the production of N-green prototypes; Evaluation of nitrogen bioavailability efficiency of different N-green organic fertilizer prototypes; Evaluation of the efficiency of N-green fertilizer prototypes in the productivity of crops of agronomic interest; Evaluate the possibility of N-green fertilizer in the production of vegetable seedlings as an organic substrate.

Based on exposed above, the members of the doctoral qualification committee proposed 6 questions for the theoretical evaluation of the present author, they are:

- Discuss your H0: “The composting of gliricidia biomass contributed to increase the nitrogen bioavailability of N-Green” in contrast to another HO: “N-Green is a slow-release fertilizer, as it controls the action of edaphic organisms”.

- Considering an extraction of 130 kg of N by a given crop, what is the needed N-Green addition per hectare and what is the cultivation area with gliricidia to supply this N? Consider the releasing rate of this nutrient by organic fertilizers and the cycle of different crops receiving this fertilizer.

- Characterize, according to the literature, what is fine coal and organic fertilizer. Discuss the variability of these products, considering the existing universe. Present advantages and disadvantages of each one and make a contrast between them, including emphasizing the accumulation of C in the soil.

- How the addition of N-green can alter the biological characteristics of the soil?

- Assuming that fertilizers are used to meet the nutrient demand of plants, what would be the advantage of using a product consisting of plant biomass as a source of nitrogen?

Support your answer considering quantitative aspects, considering dose and efficiency, and qualitative aspects, addressing the dynamics of N release over time.

- How does composting contribute to the production process of an organic fertilizer and a soil conditioner?

COMMITTEE MEMBERS:
Interno - ***.282.827-** - BRUNO JOSÉ RODRIGUES ALVES - EMBRAPA
Interno - 2213075 - EVERALDO ZONTA
Externo à Instituição - JOSÉ GUILHERME MARINHO GUERRA - EMBRAPA
Presidente - ***.320.637-** - MARIA ELIZABETH FERNANDES CORREIA - EMBRAPA