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Estimativa da área foliar em diferentes estados fenológicos baseada em descritores alométricos de rosas de corte cv 'Red Naomi'

Abstract
EnglishA number of models for estimating leaf area (LA) are available in the literature, but these were frequently developed for a specific phase of the production (generally the harvest). This study aimed at estimating the LA in different phenological stages using non-destructive allometric measurements of cut rose cv 'Red Naomi' grown in soilless system. A statistical model was developed based on the following allometric measures: leaf length (LL), leaf width (LW), leaf position (LP), number of leaflets (NL) and different combinations of these parameters. The estimated model based on 176 leaves obtained from 20 stalks harvested at different developmental stages explained 92% of the LA variance (R2 = 0.92, n = 176, p portuguesExistem disponiveis na literatura varios modelos para estimar a area foliar (AF), mas de um modo geral estes foram desenvolvidos para uma fase especifica do ciclo cultural (geralmente a colheita). Este estudo teve como objetivo estimar a AF da rosa de corte cv 'Red Naomi' cultivada em sistema sem solo recorrendo a medicoes alometricas nao-destrutivas em diferentes fases fenologicas. Para tal, foi desenvolvido um modelo estatistico baseado na tecnica de “regressao multipla passo a passo” e considerando os seguintes descritores: comprimento da folha (CF), largura da folha (LF), posicao da folha (PF), numero de foliolos (NF) e diferentes combinacoes destes descritores. O modelo desenvolvido, com base em 176 folhas a partir de 20 hastes colhidas em diferentes estados fenologicos, explicou 92% da variabilidade da AF (R2 = 0.92; n = 176; p

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References
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Journal ArticleDOI

Review of methods for in situ leaf area index determination Part I. Theories, sensors and hemispherical photography

TL;DR: It is suggested that the use of a digital camera with high dynamic range has the potential to overcome a number of described technical problems related to indirect LAI estimation.
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Ground‐based measurements of leaf area index: a review of methods, instruments and current controversies

TL;DR: The accuracy, sampling strategy and spatial validity of theLAI measurements have to be assessed for quality assurance of both the measurement and the modelling purposes of all the LAI-dependent ecophysiological and biophysical processes of canopies.
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A Simple, Cost-Effective Method for Leaf Area Estimation

TL;DR: The millimeter graph paper method can be used for estimating leaf area in lieu of leaf area meter, and can estimate accurately the leaf area of plants in many experiments without the use of any expensive instruments.
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A new method for estimating the leaf area index of cucumber and tomato plants

TL;DR: The LAI estimations presented high precision and accuracy when the proposed methodology was used resulting in time and effort savings and being useful for both crops.
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A simple model for estimating leaf area of hazelnut from linear measurements

TL;DR: In this paper, a linear model with LW as the independent variable (LA = 2.59 + 0.74 LW ) provided the most accurate estimate (R 2 ǫ = 0.982, MSE = 29) of hazelnut LA.