r) of the cylinder's surface formed by the diameter and the height of the crown and the smallest area (Am) possible from the cylinder that has the same volume as that estimated with the original variables of the crown. That is, the behavior of AmlAr1, is studied and is referred to as efficiency.The performance of the relationship as a function of time was examined using Schumacher’s empirical model of growth. Solving far age in the model and with the mean values of the measurements of the relationship of the species studied, for a minimum acceptable efficiency (EMA) of 0.97, the ages at which this value is reached for each species were calculated. These ages coincide with the reduction of the mean annual increase in diameter.">