Banca de DEFESA: DENIS DE PINHO SOUSA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : DENIS DE PINHO SOUSA
DATA : 31/07/2020
HORA: 09:00
LOCAL: Auditorio da Pos graduação
TÍTULO:

ENERGY BALANCE AND THERMICAL-HIDRICS NEEDS OF IRRIGATED AÇAÍ PALM IN NORTHEAST OF PARÁ.

PALAVRAS-CHAVES:

Euterpe Oleracae Mart., cardinal temperatures, degree days, Bowen ratio, energy balance, evapotranspiration.

PÁGINAS: 85
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Agrometeorologia
RESUMO:

The economic appreciation and the increased demand for products originating from acai palm has promoted the expansion of its cultivation to upland areas since the 90s, however, several bottlenecks were created during the process of expansion of the crop, among which highlight the thermal requirements and water, as well as possible changes in the energy balance due to the change in land use by the açaí tree. To clarify these obstacles, an experiment was carried out in the municipality of Capitão Poço in a 10-hectare açaí plantation between 2017 and 2019, where a micrometeorological tower was installed and instrumented in the center of the experimental area for monitoring meteorological variables. Subsequently, the upper and lower basal temperatures were evaluated using the degree-day method, as well as the durations and thermal requirements for the different phenological stages. The energy balance was obtained using the Bowen ratio method and the available energy was partitioned into flows of heat in the soil, sensitive heat, latent heat and flow stored in the plant canopy. Basal temperatures varied throughout the cycle, with the flowering stage being the most sensitive with thermal amplitude between Tb and TB of 18.73 ° C. The total duration of the cycle was 316 days with a total thermal requirement of 4545.98 degree-days. The theory of degree-days shows to be an efficient method in the phenological simulation with errors of estimate of at most 11.89% for the crop cycle. When planting açaí, the available energy is divided on average by 67% for evapotranspiration, 29% for heating the air and 4% for heating the soil. The effect of the heat stored in the acai palm canopy is irrelevant because it represents only 0.16% of the available energy. The expansion of the acai palm to land areas promoted the change in the partition of energy flows, when compared to the already known pattern of flows in a native forest. It was observed that the acai palm presents variation in water consumption throughout the cycle, with a daily average of 3.48 mm day-1 and a total average consumption of 1064.85 mm, whereas the Kc of açaí is maximum during the green fruit stage, when there is minimal fruit growth during pre-flowering. The results obtained in this research serve to guide the use of water resources by the acai palm, creating conditions for the sustainable management of the natural resources of water and soil.

MEMBROS DA BANCA:
Presidente - 1356961 - PAULO JORGE DE OLIVEIRA PONTE DE SOUZA
Interno - 409.920.632-72 - ALESSANDRO CARIOCA DE ARAÚJO - UFRA
Externo à Instituição - CLAUDIO JOSE REIS DE CARVALHO - EMBRAPA
Externo à Instituição - HILDO GIUSEPPE GARCIA CALDAS NUNES - MPEG
Externo à Instituição - VIVIAN DIELLY DA SILVA FARIAS - UFPA