AVALIAÇÃO DO ESTADO HÍDRICO DE CULTIVARES DE MILHO POR IMAGENS AÉREAS

Aderson Soares de Andrade Junior; Edson Alves Bastos; Carlos Antonio Ferreira de Sousa; Raphael Augusto das Chagas Noqueli Casari; Braz Henrique Nunes Rodrigues

doi:10.1590/1983-21252021v34n219rc

Authors

Aderson Soares de Andrade Junior Embrapa Meio-Norte, Teresina, PI https://orcid.org/0000-0002-0619-1851
Edson Alves Bastos Embrapa Meio-Norte, Teresina, PI https://orcid.org/0000-0002-6910-8162
Carlos Antonio Ferreira de Sousa Embrapa Meio-Norte, Teresina, PI https://orcid.org/0000-0003-3497-0761
Raphael Augusto das Chagas Noqueli Casari Embrapa Agroenergia, Brasília, DF https://orcid.org/0000-0002-5996-4432
Braz Henrique Nunes Rodrigues Embrapa Meio-Norte / Unidade de Execução de Pesquisa, Parnaíba, PI https://orcid.org/0000-0003-0094-6333

DOI:

https://doi.org/10.1590/1983-21252021v34n219rc

Keywords:

Zea mays L.. ARP. Remote sensing. RGB imagens.

Abstract

The objective of this study was to evaluate the water status of maize cultivars through thermal and vegetation indexes generated from multispectral aerial images obtained from an unmanned aerial vehicle (UAV), and correlate them with physiological indicators and soil water contents. The application of three water regimes based on the reference evapotranspiration (ETo) (30%, 90%, and 150% ETo) was evaluated for two maize cultivars (AG-1051 and BRS-Caatingueiro). An UAV was used to acquire thermal and multispectral images. The indexes evaluated were CWSI, CI-G, CI-RE, CIV, NDVI and OSAVI, which were correlated with gas exchange and soil moisture measures. The CWSI present correlation with physiological indicators (stomatal conductance, transpiration, and net CO₂ assimilation rate) that can be used to evaluate water status of maize plants. The multispectral vegetation indexes NDVI and OSAVI can replace the CWSI thermal index in water status evaluations for maize plants.

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Author Biography

Edson Alves Bastos, Embrapa Meio-Norte, Teresina, PI

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