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.
Highlights
Leaf area (LA) is a determinant factor in many physiological and agronomic processes, in terms of growth, photosynthesis, transpiration, water and nutrients use and productivity (Gao et al, 2012; Nangju and Wanki, 1980; Pandey and Singh, 2011).implementation of operational and accurate processes for measuring and estimating crop leaf area (LA) has long been a concern for researchers
The literature points out the need for leaf area (LA) calibration models that are suitable for specific varieties
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)
Summary
Leaf area (LA) is a determinant factor in many physiological and agronomic processes, in terms of growth, photosynthesis, transpiration, water and nutrients use and productivity (Gao et al, 2012; Nangju and Wanki, 1980; Pandey and Singh, 2011).implementation of operational and accurate processes for measuring and estimating crop LA has long been a concern for researchers. One of the most frequently used indirect methods for LA estimation is based on observations and measurements of allometric parameters of the plants, which are used as inputs in mathematical models (Montgomery, 1911; Peksen, 2007). Such mathematical models are based on the correlation between the allometric measures of plants and the area of the leaves. These methods are non-destructive and allow for faster LA determination, eventually being suitable for automation. An adequate parameterization and calibration of such methods is necessary
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