Detecção do estado hídrico em híbridos de milho com imagens aéreas obtidas por aeronave remotamente pilotada

Alzeneide da Silva Lopes; Aderson Soares de Andrade Júnior; Edson Alves Bastos; Carlos Antônio Ferreira de Sousa; Raphael Augusto das Chagas Noqueli Casari; Magna Soelma Beserra de Moura

doi:10.1590/1983-21252024v3711701rc

Autores

Alzeneide da Silva Lopes Postgraduate Program in Agronomy, Universidade Federal do Piauí, Teresina, PI, Brazil https://orcid.org/0000-0002-6086-3567
Aderson Soares de Andrade Júnior Embrapa Meio-Norte, Teresina, PI, Brazil https://orcid.org/0000-0002-0619-1851
Edson Alves Bastos Embrapa Meio-Norte, Teresina, PI, Brazil https://orcid.org/0000-0002-6910-8162
Carlos Antônio Ferreira de Sousa Embrapa Meio-Norte, Teresina, PI, Brazil https://orcid.org/0000-0003-3497-0761
Raphael Augusto das Chagas Noqueli Casari Embrapa Agroenergia, Brasília, DF, Brazil https://orcid.org/0000-0002-5996-4432
Magna Soelma Beserra de Moura Embrapa Semiárido, Petrolina, PE, Brazil https://orcid.org/0000-0002-2844-1399

DOI:

https://doi.org/10.1590/1983-21252024v3711701rc

Palavras-chave:

Drone. Cultivar. Estresse hídrico. Índice de vegetação. Sensoriamento remoto.

Resumo

Objetivou-se avaliar a capacidade de índices de vegetação (IV), obtidos de imagens aéreas por aeronave remotamente pilotada (ARP), em detectar o estado hídrico de híbridos de milho submetidos a diferentes regimes hídricos, nas condições de solo e clima de Teresina, Piauí, Brasil. Avaliou-se a aplicação de cinco regimes hídricos (RHs) com base na evapotranspiração da cultura (ETc) (40%, 60%, 80%, 100% e 120% da ETc) em três híbridos de milho: BRS 3046 (híbrido triplo convencional); BRS 2022 (híbrido duplo convencional); e Status VIP3(híbrido simples transgênico). O delineamento experimental foi o de blocos ao acaso, parcelas subdivididas, sendo as parcelas os RHs e as subparcelas os híbridos, com quatro repetições. Utilizou-se uma ARP para a aquisição das imagens multiespectrais. Avaliaram-se 18 índices de vegetação, os quais foram correlacionados com medidas de condutância estomática (gs), conteúdo relativo de água na folha (CRA) e produtividade de grãos (PG). Os IVs TCARI-RE e NDVI apresentaram correlação com gs e os IVs MNGRD e GCI foram correlacionados com o CRA e, portanto, são considerados promissores na detecção do estado hídrico do milho. Os IVs NDVI e WDRVI apresentaram correlações com a PG. Os mapas de NDVI, MNGRV e WDRVI mostraram correlação espacial com as medidas de gs, CRA e PG, respectivamente em resposta aos RHs, indicando aplicação potencial na detecção do estado hídrico do milho por meio de imagens aéreas obtidas por ARPs.

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