Banca de DEFESA: MATHEUS LIMA RUA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MATHEUS LIMA RUA
DATE: 28/02/2025
TIME: 08:00
LOCAL: sala virtual
TITLE:

CROP EVAPOTRANSPIRATION AND WATER PRODUCTIVITY IN ECONOMICALLY IMPORTANT FRUIT TREES IN THE AMAZON

KEY WORDS:

Amazon fruit growing, Water balance, Irrigation

PAGES: 76
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Agrometeorologia
SUMMARY:

The aim was to determine crop evapotranspiration and water productivity in fruit trees of economic importance in the Amazon. The study was conducted in commercial plantations distributed in four municipalities in the state of Pará, being located in: Castanhal in açaí plantation (Euterpe oleraceae Mart.), Santa Izabel do Pará in coconut plantation (Cocos nucifera L.), Capitão Poço in acid lime planting (Citrus latifólia T.) and Vitória do Xingu planting of cocoa (Theobroma cacao L.). Towers were installed in all experimental areas, housing meteorological sensors to measure temperature and relative humidity, global solar radiation, rainfall and volumetric water content in the soil. Crop evapotranspiration (ETc) was calculated using the soil water balance method. Water productivity (WP) was determined by the ratio between production and ETc. For the study areas, a completely randomized design with subdivided plots was applied, with two treatments (irrigated and non-irrigated) and two monitoring periods (rainy and less rainy). For ETc data, the Kruskal-Wallis and Wilcoxon-Mann-Whitney tests were applied (p < 0.05). For water productivity data (compared only between treatments), the means were compared by Student's t-test (p < 0.05). For ETc data, during the rainy season (PC), none of the studied fruit trees showed any difference in the treatment averages. In the less rainy season (PMC), the irrigated treatment showed higher ETc averages compared to the non-irrigated treatment. Comparing the periods, in the irrigated treatment, the highest ETc averages for all fruit trees were observed during the PMC in relation to the PC. In the non-irrigated treatment, only the green dwarf coconut and acid lime obtained higher ETc averages in the PMC, while the ETc averages of the açaí and cocoa trees were lower during the PMC compared to the PC. In the Pa results, for the açaí, acid lime and cocoa crops, higher averages of the productivity components were observed in the irrigated treatment compared to the non-irrigated treatment. The observed Pa averages of all evaluated components were higher in the irrigated treatment in the açaí and acid lime crops, while in the cocoa crop, the averages of the evaluated Pa components did not differ between treatments. For the green dwarf coconut experimental site, no comparison was made between treatments due to the difference in plant age. However, when comparing the years 2023 and 2024, an increase in the production of coconut fruits and water was observed in the irrigated treatment, while in the non-irrigated treatment, there was only an increase in the volume of coconut water. In terms of Pa, in 2024, there was an increase in the Pa components evaluated in both treatments compared to 2023. In this sense, it was observed that irrigation enabled better responses to the increase in evaporative demand in periods of lower rainfall. In the water productivity study, irrigation provided satisfactory responses for the productivity components of the fruit trees studied, ensuring greater yield.

COMMITTEE MEMBERS:
Presidente - 1356961 - PAULO JORGE DE OLIVEIRA PONTE DE SOUZA
Externa ao Programa - 2077542 - DAIANE DE CINQUE MARIANO - UFRAExterna à Instituição - MIRTA TERESINHA PETRY
Externa à Instituição - SILVIA MARIA DANTAS - UFCG