Banca de DEFESA: DEBORAH LUCIANY PIRES COSTA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DEBORAH LUCIANY PIRES COSTA
DATE: 29/06/2021
TIME: 08:00
LOCAL: meet.google.com/ibq-bnsr-die
TITLE:

Production and economic viability of açaí palm (Euterpe oleracea Mart.) irrigated in monoculture and intercropped with cupuaçu trees under different water availability in Castanhal-PA, eastern Brazilian Amazon

KEY WORDS:

Açaí-de-touceira; Cupuaçu; Irrigation; Microclimate; Yield.

PAGES: 96
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Agrometeorologia
SUMMARY:

The açaí palm (Euterpe oleracea Mart.) is a plant species native to the Amazon, whose fruits are prominent in the Brazilian and international markets. The growing demand for these fruits encouraged the growth of irrigated plantations on dry land. However, the management of irrigation in these cultivations has not yet been consolidated, since there are no technical and economic assessments considering the different cultivation systems adopted by farmers in the region. The objective of this study was to evaluate the production and economic viability of açaí palm cultivation under different irrigation depths in monoculture and intercropped with cupuaçu trees in the micrometeorological conditions of Castanhal, state of Pará, eastern Brazilian Amazon. The experiment was conducted in area of 0.6 ha (1°19'24.48 "S and 47°57'38.20" W, 41 m), dimensioned in a completely randomized design, where 8 and 10 replications were evaluated for açaí palms and cupuaçu trees, respectively. In the experimental area, a micrometeorological tower was installed to quantify rainfall, air temperature and relative humidity, wind speed, global incident radiation and soil volumetric water content. Irrigation was estimated based on reference evapotranspiration fractions: TS (without irrigation - rainfed), T50, T100 and T150, referring to 50%, 100% and 150%, respectively. During 2018 and 2019, the reproductive phenology of açaí palm, yield, water use efficiency and economic viability indicators of açaí palm and cupuaçu tree were evaluated. The results indicated that water availability significantly affected the yield and water use efficiency in the açaí palm cultivation. The replacement of 150% of the reference evapotranspiration promoted better performance, with yield gains between 43.35% (monoculture) and 44.04% (intercropping) when compared to cultivation without irrigation. The maximum water use efficiency was achieved with the application of T150, corresponding to 3.89 kg ha^-1 mm^-1, in the monoculture area, while the minimum was equal to 0.92 kg ha^-1 mm^-1. Cupuaçu tree had better performance in response to T100, whose fruit production was 68% higher than in TS, following the same trend of water use efficiency, which was maximum in T100 (2.615 kg ha^-1 mm^-1) and minimum in TS (1.105 kg ha^-1 mm^-1). The economic indicators revealed that all treatments are viable in both cultivation systems, but irrigation promoted better performances, especially the replacement of 100% of the reference evapotranspiration in the intercropping, with net present value (NPV) of US$9,952.80, internal rate of return (IRR) of 44.35%, and benefit/cost (B/C) ratio of 1.95. On the other hand, rainfed resulted in lower indicators, especially monoculture, which presented NPV of US$1,696.24, IRR of 21.35% and B/C ratio of 1.19. Therefore, the cultivation of açaí palm intercropped with cupuaçu trees and irrigated with 100% of the reference evapotranspiration generates greater profitability for farmers.

BANKING MEMBERS:
Interna - 2494920 - ANTONIA BENEDITA DA SILVA BRONZE
Externa à Instituição - LUCIETA GUERREIRO MARTORANO - EMBRAPA
Presidente - 1356961 - PAULO JORGE DE OLIVEIRA PONTE DE SOUZA
Externo à Instituição - THIERES GEORGE FREIRE DA SILVA - UFRPE
Externo à Instituição - WELLINGTON FARIAS ARAUJO - UFRR