ARTÍCULO
TITULO

Estimation of leaf area in pecan cultivars (Carya illinoinensis).

Silvana Irene Torri    
Carla Descalzi    
Enrique Frusso    

Resumen

Nondestructive and mathematical approaches of modeling can be very convenient and useful for plant growth estimation. The objective of this research was to develop a simple, accurate and nondestructive predictive model for leaf area (LA) estimation in different pecan cultivars (Carya illinoinensis) commonly found in Argentina. Linear and exponential regression equations were fi tted and evaluated for pecan cultivars ?Desirable?, ?Harry Super?, ?Kernodle?, ?Mahan?, ?Mahan-Stuart?, ?Shoshoni?,?Stuart? and ?Success? (grafted on seedling pecan rootstocks, 24 years old, planted at 15 x 15 m) using length (L) and width (W) alternatively or both L and W in a stepwise analysis as nonforced independent variables. Stepwise regression analysis using L and W variables for each cultivar fi tted the data better than L or W alone. A general equation for all cultivars showed high accuracy (R2 = 0.93, p<0.0001). However, for certain cultivars, the general equation provided lower precision than the model for each cultivar. Therefore, we conclude that LA can be estimated through the general or individual model for each cultivar. El conocimiento del área foliar (AF) es esencial para evaluar el crecimiento vegetal y estimar el potencial productivo de los cultivos. El objetivo de este trabajo fue desarrollar un modelo predictivo simple, preciso, no destructivo y rápido, para estimar el AF de distintos cultivares de pecán (Carya illinoinensis) en plena producción en Argentina basado en el largo (L) y ancho (A) de los folíolos. Se estudiaron ocho cultivares ?Desirable? ?Harry Super?, ?Kernodle?, ?Mahan?, ?Mahan-Stuart? ?Shoshoni?,?Stuart? y ?Success?, injertados sobre un patrón franco de pecán, de 24 años de edad, plantados a 15 x 15 m. Se obtuvo una signifi cativa correlación entre el L o A y el AF de los folíolos. Las mejores correlaciones para cada cultivar se obtuvieron a partir de un análisis discriminante, considerando como variables independientes no forzadas el L y A de cada foliolo. Se propone una ecuación general para el cálculo del AF de todos los cultivares. Sin embargo, para ciertos cultivares la ecuación general permitió un menor ajuste que la presentada para el respectivo cultivar. Se concluye que, según la precisión deseada, puede adoptarse la ecuación general para todos los cultivares o la ecuación particular para cada cultivar.

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