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Provedor de dados:  Ciência Rural
País:  Brazil
Título:  Nitrogen management in wheat based on the normalized difference vegetation index (NDVI)
Autores:  Vian,André Luis
Turra,Marcos Alexandre
Giordano,Cecília Paz da Silva
Silva,Jhonatan Alves da
Drum,Maicon Andreo
Data:  2018-01-01
Ano:  2018
Palavras-chave:  Triticum aestivum
Vegetation sensor
Variable rate
Resumo:  ABSTRACT: Biomass production and nitrogen (N) accumulated in wheat shoots may be used for quantifying optimal topdressing nitrogen doses. The objective of this study was to develop and validate models for estimating the amount of biomass and nitrogen accumulated in shoots and the N topdressing dose of maximum technical efficiency in wheat using the normalized difference vegetation index (NDVI) measured by an active optical canopy sensor. Field experiments were carried out in two years and treatments consisted of N doses applied at plant emergence and as topdressing. NDVI, shoot biomass and N accumulated in shoots at the growth stage of six fully expanded leaves and grain yield were evaluated, being determined the topdressing N dose of maximum technical efficiency (DMTE). The NDVI was positively correlated to shoot biomass and N content in shoots and models for the relationship between these variables were developed and validated. The DMTE was negatively correlated with the NDVI value evaluated at the moment of N topdressing application. Thus, NDVI evaluation by an active optical canopy sensor can be used for nitrogen fertilization in variable rate, allowing the adjustment of applied N doses in different areas within a field.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Universidade Federal de Santa Maria
Relação:  10.1590/0103-8478cr20170743
Formato:  text/html
Fonte:  Ciência Rural v.48 n.9 2018
Direitos:  info:eu-repo/semantics/openAccess

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