Portal de Periódicos da CAPES

MODELOS DE REGRESIÓN PARA ESTIMAR ÁREA DE LA HOJA Y BIOMASA DE ÓRGANOS EN ÁRBOLES JÓVENES DE MANZANO

2007; Chapingo Autonomous University; Volume: XIII; Issue: 2 Linguagem: Inglês

10.5154/r.rchsh.2007.02.010

2007-4034

Arturo Curiel-Rodríguez, J. R. Espinoza-Espinoza, J.P. Cruz-Hernández, Gustavo Almaguer-Vargas,

Leaf Properties and Growth Measurement

In apple trees, leaf sheet area and shoot biomass are basic variables in growth, source-sink relationships and productivity researches. The aim of this studio was to build empirical mathematical models using multiple linear regression techniques to estimate leaf sheet area (LSA) and shoot biomass in “Agua Nueva II” young apple trees. All linear regression models obtained have high precision (R2 above 0.969). LSA (in square centimeters) was estimated with the model LSA= -3.24140(MWS) + 0.67616(MWS)2 + 1.63287(MWS)(LS/MWS), where MWS stands for maximum wide of leaf and LS for leaf length. The dry weight of leaf sheet (DWLS) was estimated with the model DWLS= 0.02699(LSA) + 0.00021917(LSA)2. The dry weight of petiole (DWP) was estimated as DWP = 0.00384(LSA) - 0.04432(LS/MWS) + 0.02291(LS/MWS). The dry weights (in g) of radical system (DWRS), of stem (DWS), of principal stem (DWPT), of large branches (DWBL), of medium branches (DWBM), and of short branches (DWBS) are a function of fresh branch volume (FV). The formulae of truncated cone was used to calculate FV (in cubic centimeters); for this, it was required proximal (basal) and distal (apical) diameters of branches, and its length. The branch dry weights were estimated with the following models: DWP = 0.66882(FV), DWPT = 0.55902(FV), ln(DWBL) = 0.77462[ln(FV)], DWBM = 0.49349(FV) and DWBS = 0.57297(FV). The model for dry weight of radical system (DWRS) is function of length and distal diameter of trunk: DWRS = 10.80747(LPT)(DDT) + (-01.37171) (DDT)2 The length and diameter variables in leaf, trunk, stem and branches were expressed in centimeters.