African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Maize leaf area estimation in different growth stages based on allometric descriptors

Sosdito Estevao Mananze
  • Sosdito Estevao Mananze
  • Geo-Space Sciences Research Center, Rua do Campo Alegre s.n., 4169-007 Porto, Portugal.
  • Google Scholar
Isabel Pocas
  • Isabel Pocas
  • Geo-Space Sciences Research Center, Rua do Campo Alegre s.n., 4169-007 Porto, Portugal.
  • Google Scholar
Mario Cunha
  • Mario Cunha
  • Geo-Space Sciences Research Center, Rua do Campo Alegre s.n., 4169-007 Porto, Portugal.
  • Google Scholar


  •  Received: 04 December 2017
  •  Accepted: 20 December 2017
  •  Published: 25 January 2018

Abstract

The literature points out the need for leaf area (LA) calibration models that are suitable for specific varieties (variety-specific). These models should be capable of coping with different crop conditions, growth stages, and agronomic practices. The objective of the current study was to develop a model for estimating the LA of ​​maize (Zea mays L.), considering the entire growth cycle, based on non-destructive allometric measurements. The proposed model was derived from a multiple regression analysis of LA data obtained from digital image processing, including the number of leaves per plant (NL) and the product of major leaf length per major leaf width of the greater leaf (MLL × MLW). A high percent of data variability in the LA of maize plants was explained by the model, both in the calibration and validation phases (R2 = 0.90; n = 30). Overall, the selected model presented good performance in the estimation of LA of maize, variety PAN 53, cultivated under the conditions of the present study area. Additionally, the model enabled the estimation of LA at different stages of the crop cycle. The results indicated a positive potential for using the developed model to support several maize cultural practices.

 

Key words: Allometry, non-destructive measurement, modelling, Zea mays.