Nitrogen doses in topdressing affect vegetation indices and corn yield

Authors

  • Fabio Henrique Rojo Baio Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul
  • Eder Eujácio da Silva Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul
  • Igor Mendes Scarpim Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul
  • Cid Naudi da Silva Campos Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul
  • Paulo Eduardo Teodoro Universidade Federal de Mato Grosso do Sul, Campus de Chapadão do Sul

DOI:

https://doi.org/10.14393/BJ-v35n5a2019-42292

Keywords:

multivariate analysis, remote sensing, correlation network, Zea mays.

Abstract

Nitrogen is the main nutrient required by corn crop, especially in Cerrado soils. Remote sensing techniques can be used to generate additional information now of nitrogen fertilization recommendation. This work investigated the association of plant height and dry matter phenological variables together with NDVI, REDEDGE, SAVI, and IV 760/550 vegetation indices (VIs) with corn grain yield, under different N doses. Sowing occurred in November 2016, at a spacing of 0.45 m between rows and a 60,000 ha-1 plant population. Four N doses (0, 80, 160, and 240 kg of N ha-1) were applied at phenological stage V4. The experimental design consisted of randomized blocks, containing four N doses in topdressing and 16 replications. The active optical sensor Crop Circle ACS-470 was used to obtain the VIs. The NDVI, SAVI, and RE indices have a high positive association with each other and with the variables plant height and dry matter. Polynomial regression equations were adjusted between the variables in response as doses of N. Afterwards, they were estimated as correlations between variables and results expressed through the network of correlations. Finally, a multivariate analysis of canonical variables was performed to understand the interrelationship between the variables and each dose of N applied. NDVI and RE have a positive relationship of moderate magnitude with grain yield in corn crops.

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Published

2019-10-09

How to Cite

BAIO, F.H.R.., SILVA, E.E. da ., SCARPIM, I.M.., CAMPOS, C.N. da S.. and TEODORO, P.E., 2019. Nitrogen doses in topdressing affect vegetation indices and corn yield. Bioscience Journal [online], vol. 35, no. 5, pp. 1432–1437. [Accessed21 June 2024]. DOI 10.14393/BJ-v35n5a2019-42292. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/42292.

Issue

Section

Agricultural Sciences