Banca de QUALIFICAÇÃO: CONSTANTINO ANTONIO CAVALCANTE JUNIOR

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : CONSTANTINO ANTONIO CAVALCANTE JUNIOR
DATE: 22/06/2022
TIME: 15:00
LOCAL: Sala 04 da Pós-graduação
TITLE:

IRRIGATED SOYBEAN GROWING AND MODELING WITH FAO AQUACROP®

KEY WORDS:

Crop evapotranspiration; Glycine max;  agricultural modeling.

PAGES: 72
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Manejo e Tratos Culturais
SUMMARY:

Soybean (Glycine max (L.) Merrill) is an agricultural crop with great economic and social importance for Brazil. The objective of this work was to evaluate the growth and productivity of soybean cultivated under different irrigation levels, in the region of Rio Largo, AL and in cultivated areas in the state of Alagoas, and to adjust, calibrate and validate the AquaCrop® FAO model to estimate of production components such as: total phytomass accumulation, grain yield and physiological aspects. The experiment was carried out between October 28, 2020 and March 1, 2021 (124 days), in an area of 2,660 m2, seeds were inoculated with nitrogen-fixing bacteria, with manual seeding and final plant population to cultivate Monsoy 8644 (C1) and Monsoy 8349 (C2) of 200,000 and 300,000 plants per hectare, respectively. The design used was in randomized blocks with split plots and four replications. The treatments consisted of crop evapotranspiration fractions (35, 70, 105, 140, 175 and 210% and two soybean cultivars). The six irrigation levels were in the plots and the two cultivars in the subplots. For model calibration, data from the experiment conducted in Rio Largo in 2018 by Barbosa (2021) and validated with the experiment conducted by the same author in 2019 and another in a commercial area in the region of Atalaia - AL were used. The growth variables collected every two weeks were used to adjust the models: logistic growth, Sigmoidal, 3-parameter and peak log normal, in addition to multiple regression to estimate total dry biomass and soybean grain yield. The application of different treatments as a function of crop evapotranspiration (ETc) promoted a significant difference for: net photosynthesis rate, leaf water potential, photosystem II quantum yield, effective quantum efficiency and SPAD index. The water stress caused by excess or deficit resulted in a reduction in stomatal conductance, transpiration, photosynthesis and total chlorophyll of the two soybean cultivars. The AquaCrop® FAO model presented good performance between observed and simulated values of soil moisture, accumulation of total fitmass and grain yield during calibration and validation, being indicated to assist in the decision making of irrigation management and soybean cultivation strategies

BANKING MEMBERS:
Interno - 1790454 - GUILHERME BASTOS LYRA
Presidente - 1206894 - IEDO TEODORO
Externo à Instituição - IVOMBERG DOURADO MAGALHÃES