Banca de DEFESA: LAÉRCIO WASHINGTON BITTENCOURT FILHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LAÉRCIO WASHINGTON BITTENCOURT FILHO
DATE: 02/03/2026
TIME: 10:00
LOCAL: Sala 1 PPGF
TITLE:

Fertilization of broccoli with poultry litter-based amendments and biochar: Yield, market quality, and nutritional composition

KEY WORDS:

Brassica oleracea var. italica; Baixada Fluminense; nutrient uptakes; biochar; poultry litter.

PAGES: 82
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Manejo e Tratos Culturais
SUMMARY:

Broccoli (Brassica oleracea var. italica) is one of the main vegetables cultivated in the state of Rio de Janeiro. Its production can be constrained by climatic conditions and nutritional requirements, which may be mitigated through the appropriate choice of cultivar, planting season and location, as well as fertilizer application. In this context, the present study was conducted with the following objectives: (a) to evaluate the agronomic efficiency of poultry litter compost enriched with biochar during the composting process, and to compare it with other fertilization options; (b) to assess the effects of the tested composts on the concentrations and accumulation of macro- and micronutrients in the vegetative and reproductive parts of broccoli plants. Three experiments were carried out: the first under field conditions and the subsequent two in a greenhouse, at the Horticulture Sector of UFRRJ, Seropédica, RJ. In the first two trials, organic composts were matured for 60 days, while in the third trial composts had 30 days of maturation. The first experiment, conducted from July to October 2024, tested two cultivars (Coliseu and Legacy) and four fertilization treatments: mineral NPK, poultry litter composted alone, poultry litter composted with biochar, and an unfertilized control. The second experiment, conducted from May to July 2025, used only the cultivar Coliseu and eight fertilization treatments: mineral NPK, fresh poultry litter, poultry litter composted alone, poultry litter composted with biochar, poultry litter composted with biochar plus the soil conditioner Vittia at planting, and pure biochar and Vittia applied at planting. The third experiment, conducted from August to October 2025, used the cultivars Coliseu and Festival and the same treatments as the second trial, but with shorter composting time (30 days) and substitution of fresh litter with poultry litter composted for 90 days. At the end of each cycle, harvests were performed and plant development, yield, and inflorescence quality were evaluated. In the second trial, nutrient concentrations and accumulation in vegetative parts and inflorescences were also assessed. In the first experiment, fresh inflorescence mass (FIM) ranged from 375 g in the NPK treatment to 205 g in the control. Total yield showed significant differences (p < 0.05), although no significant variation was observed in marketable yield, which ranged from 3.53 to 6.03 ton/ha. In the second experiment, FIM did not differ significantly; however, statistical differences (p < 0.05) were observed in K, Ca, and Zn concentrations in inflorescences, and in N, P, Mg, Fe, and Cu concentrations in vegetative parts, with higher K levels in inflorescences under treatments CACBc260, CAF T, and biochar. In the third trial, the highest FIM (170 g) was obtained with poultry litter composted for 90 days. It can be concluded that the addition of biochar does not alter compost quality or the production of marketable broccoli inflorescences. Furthermore, the cultivation of broccoli with appropriate planting dates and cultivar selection is feasible in the Baixada Fluminense region.

COMMITTEE MEMBERS:
Presidente - 1213072 - MARGARIDA GORETE FERREIRA DO CARMO
Interno - ***.960.133-** - EDNALDO DA SILVA ARAÚJO - EMBRAPA
Externo à Instituição - HUGO JOSÉ DE OLIVEIRA ZOFFOLI - INEA