Banca de QUALIFICAÇÃO: ENZA CRUZ BATISTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ENZA CRUZ BATISTA
DATE: 26/02/2025
TIME: 08:30
LOCAL: Sala Virtual
TITLE:

GROWTH OF AÇAIZEIRO SEEDLINGS (Euterpe oleracea Mart.) IN YELLOW LATOSOL, SUBJECTED TO DIFFERENT DOSES OF BORON AND POTASSIUM

KEY WORDS:

Euterpe oleracea Mart; Mineral nutrition; Borate and potassium fertilization; Yellow Latosol; Amazonian soil

PAGES: 44
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

The açaí palm (Euterpe oleracea Mart.) is a member of the Arecaceae family, naturally found in the Amazon region. Its fruits and violet-colored pulp hold significant social and economic importance for the North region of Brazil, as they are culturally consumed as food and because most of the production is concentrated in this area, particularly in the state of Pará, the largest producer and exporter of the product. The increasing demand for its derivatives, especially the pulp, has led to a considerable expansion in production areas, highlighting the need for more information on crop management. However, there are still many gaps regarding the management and nutritional requirements of the species. Boron (B) is a crucial micronutrient for plants, primarily playing a role in cell wall formation and cell division, making it essential for the development of growing organs such as roots and apical buds. Potassium (K) is a well-known macronutrient involved in osmotic regulation, being important for the opening and closing of stomata, cell division, and the transport of photoassimilates. Its deficiency manifests as tissue drying and death, as well as overall stunted growth. Given the above, this study aims to evaluate the effects of different doses of boron (B) and potassium (K) on the growth of açaí seedlings of the BRS Pai D’égua variety (Euterpe oleracea Mart.), cultivated in 8-liter pots containing Yellow Latosol, in a greenhouse at the Federal Rural University of the Amazon, from November 2024 to May 2025. The experiment follows a completely randomized design in a factorial scheme (4x4), totaling 16 treatments and 80 experimental units. Liming was performed 21 days before transplanting (DAT) to raise base saturation to 60%. As nutrient sources, potassium chloride (60% K₂O) and Granubor (15% B) were used in proportions of 0.1, 0.2, 0.3, and 0.4 g dm⁻³ and 0, 0.001, 0.002, 0.003 g dm⁻³, respectively, along with basal fertilization using stabilized urea (45% N, CH₄N₂O), potassium chloride (60% K₂O), and single superphosphate (16% P and 10% S, Ca(H₂PO₄)₂ + CaSO₄·2H₂O). Biometric parameters will be determined monthly by measuring the number of leaves, plant height, and stem circumference. Physiological parameters will be assessed through gas exchange measurements, chlorophyll fluorescence, and light absorption and reflection, using IRGA, a fluorometer, and Spectravue equipment. Nutritional analyses will be conducted at the end of the experiment through nitro-perchloric digestion to measure nutrient accumulation. Statistical analyses will be performed using R software.

COMMITTEE MEMBERS:
Interno - 1228204 - MARIO LOPES DA SILVA JUNIOR
Externa ao Programa - 2593462 - SANDRA ANDREA SANTOS DA SILVA - UFRAExterno à Instituição - EDUARDO CEZAR MEDEIROS SALDANHA - YARA