Parametrização do modelo AquaCrop e simulação da transpiração e produtividade do algodoeiro sob lâminas de irrigação e nitrogênio
Data
2021-08-31
Autores
Fernandes, Werlen de Souza
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Editor
Universidade Federal de Mato Grosso
Resumo
The cotton plant Gossypium L. is an agricultural species of great economic and social
importance for Brazil, whose demand for technologies that enhance productivity combined with
sustainability, should be constantly sought. Productivity simulation models, such as AquaCrop,
allow the determination of the response of the crop as a function of variation in water
availability and nitrogen fertilization. Thus, this work aimed to parameterize the AquaCrop
model to evaluate the yield of cotton as a function of water and nitrogen levels. The experiment
was conducted in the experimental area of the Federal University of Rondonópolis. The soil is
classified as dystrophic Red Latosol and the cultivar used was the IMA5801B2RF. Irrigation
was by drip system with irrigation rates of 30%, 90%, and 150% of crop evapotranspiration.
Nitrogen was applied via fertigation at doses of 20, 110, and 200% of the recommended dose
for cotton. The model input parameters determined locally were soil physical parameters: field
capacity (10 kPa), permanent wilting point (1500 kPa), saturated hydraulic conductivity
(constant load permeameter); vegetative parameters: canopy cover (%); duration of
phenological stages (days); maximum depth of the root system (m); meteorological parameters:
maximum and minimum air temperature (ºC), relative humidity (%), wind speed (m s-1
), global
solar radiation (MJ m2
d
-1
). After parameterization, the model was calibrated to simulate the
effect of nutrient (N) stress. Seed cotton yields were 3495 kg ha-1
(ET90N110), 2027 kg ha-1
(ET90N20), and 2075 kg ha-1 (ET30N110). Regarding the simulation, it was observed that the
simulation of the productive variables, biomass, and seed cotton, by the AquaCrop model were
higher than the measured data. In general, the largest errors occur for the simulation of
treatments with water or nutrient stress. Despite this, the statistical parameters R2
, d and c, were
greater than 0.90, which classifies the model performance as "optimal".
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Citação
FERNANDES, Werlen de Souza. Parametrização do modelo AquaCrop e simulação da transpiração e produtividade do algodoeiro sob lâminas de irrigação e nitrogênio. 2021. 64 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2021.