Sensores de reflectância e fluorescência na avaliação de teores de nitrogênio, produção de biomassa e produtividade do algodoeiro

Translated title of the contribution: Reflectance and fluorescence sensors to assess nitrogen levels, biomass production and yield of cotton

Otavio Bagiotto Rossato, Pedro Andrade-Sanchez, Saulo Philipe Sebastião Guerra, Carlos Alexandre Costa Crusciol

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The objective of this work was to evaluate the potential of using reflectance and fluorescence sensors to assess the levels of N-NO3- in the petiole, plant biomass production and yield of cotton. A randomized complete block design was used in a 3×4 factorial arrangement, with four replicates. Treatments consisted of three cotton varieties (ST-4288-B2RF, ST-4498-B2RF and DP-164-B2RF) and of four N rates (0, 45, 90 and 135 kg ha-1). At 120 days after sowing, readings were done with optical sensors for canopy fluorescence and reflectance. There were no significant correlations for N-NO3-in the petiole with the reflectance sensor indices; however, there was correlation to biomass production (0.39) and yield (0.32 to 0.41). The fluorescence sensor indices were significantly correlated to N-NO3- in the petiole (0.34 to 0.61), biomass production (0.30 to 0.53) and yield (0.34). Compared to the reflectance indices, the fluorescence ones have a greater ability to assess the levels of N-NO3-in the petiole, a similar ability to detect' variation of plant biomass, and a lower ability to detect the variation in cotton yield when increasing rates of nitrogen are applied.

Translated title of the contributionReflectance and fluorescence sensors to assess nitrogen levels, biomass production and yield of cotton
Original languagePortuguese
Pages (from-to)1133-1141
Number of pages9
JournalPesquisa Agropecuaria Brasileira
Volume47
Issue number8
DOIs
StatePublished - 2012

Keywords

  • Gossypium
  • NDVI
  • Nutritional status
  • Precision agriculture
  • Remote sensing
  • Vegetation indices

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Agronomy and Crop Science

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