Banca de DEFESA: DIEINI MELISSA TELES DOS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DIEINI MELISSA TELES DOS SANTOS
DATE: 30/09/2025
TIME: 09:00
LOCAL: videoconferência
TITLE:

Production of Organomineral Fertilizer from Offshore Oil Well Drilling Wast

KEY WORDS:

Sustainable agriculture. Soil fertility. Physical and chemical properties of organomineral fertilizers. Soil health and quality. Use of waste in agriculture.

PAGES: 127
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

Agricultural fertilizers are important inputs for maintaining and maintaining soil fertility, especially in regions with a high degree of weathering. Seven experiments were carried out at UFRRJ – Seropédica/RJ. The first one aimed to evaluate the hardness of the OMFs pellets produced with different proportions of onshore gravel and castor bean cake. It was completely randomized design (CRD) in factorial with 9 proportions of gravel: castor bean cake (1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2 and 9:1) and 2 controls (KCl and TSF) x 4 compactions (1, 2, 3 and 4 tons) with 4 replicates. A load of 4 tons provided greater hardness of around 12, 18 and 77% in relation to the formulas produced by applying 3, 2 and 1 ton, respectively. The 1:9 proportion showed superior hardness when loads of 4, 3 and 2 tons were applied. The OMF showed lower hardness than TSF, reducing the need for addition of binder. In the second test, the hardness of the granulated OMFs produced from onshore gravel and castor bean cake in different granulometries was evaluated. It was conducted in CRD with a factorial of 9 proportions of gravel: castor bean cake (similar to the first test) and 2 controls (KCl and TSF) x 2 particle sizes (4-3 and 2 mm) with 4 replicates. The hardness of the 4-3 mm compactors was 63% higher than that of 2 mm. The 1:9 ratio showed greater hardness in the different ranges. The third test aimed to evaluate the hardness of pelletized OMFs formulated with different proportions of onshore gravel and castor bean cake. It was implemented in CRD with 11 treatments: 9 proportions of gravel: castor bean cake (similar to the first test) and 2 controls (KCl and TSF) with 4 replicates. The 4:6 treatment showed greater hardness approximately 2 times higher than 9:1 and 2:8. The fourth test aimed to evaluate the hardness of pelletized OMFs as a function of the addition of binders. It was programmed in CRD with a factorial of 3 (4:6, 5:5 and 6:4) x 2 binders (PVP and Na alginate) x 3 doses (0.5, 1, 2% and control) with 4 repetitions. A dose of 2% PVP and alginate provided greater hardness in the proportions 4:6 and 5:5. The dose of 0.5% PVP promoted higher hardness than the dose of 2% PVP and similar to the dose of 2% alginate in the proportion 6:4. The fifth experiment aimed to evaluate the dissolution of the pelleted OMF. The experiment was carried out in CRD with factorial with 3 fertilizers (OMF 4:6, KCl and TSF) x 4 rotations (50, 75, 100 and 200 rpm) x 5 times (15, 30, 60, 120 and 240 min) with 3 replicates. The behavior of K derived from the dissolution of OMF was similar between rotations. The K of OMF presented lower concentration values in the solution in relation to KCl, regardless of the rotation. The disclosure of P present in OMF, presented linear growth when presented with a rotation of 100 rpm with a maximum concentration of 22.5%. In the sixth and seventh experiments, the objective was to evaluate the predicted use of offshore gravel from the pre-salt and post-salt layers, combined with biosolids in the production of OMF in the cultivation of corn and sunflower. Both experiments were continuous in a randomized block design with a 2x4+1 factorial: 2 OMFs (pre-salt and post-salt) x 4 doses (0, 50, 100 and 200% of the dose indicated for corn and sunflower) + 1 control (NPK) with 4 replicates. A dose of 50% of the OMF produced post-salt is capable of promoting an increase in corn productivity similar to NPK. A dose of 200% of the OMF with post-salt provided greater dry mass of the leaves and diameter of the sunflower stem when compared to NPK. The study showed that OMFs, produced from waste, are safe and efficient for tropical soils. They improved soil attributes and stimulated microbial activity in corn and sunflowers, without risk of metal contamination, reinforcing their potential as a sustainable alternative to mineral fertilizers.

COMMITTEE MEMBERS:
Presidente - 2213075 - EVERALDO ZONTA
Externo ao Programa - 2938795 - FABIO CARDOSO DE FREITAS - nullExterna à Instituição - JULIA BARRA NETTO- FERREIRA
Externo à Instituição - MARCIO OSVALDO LIMA MAGALHÃES - UNEMAT
Interno - 1060711 - MARCOS GERVASIO PEREIRA