Expression allométrique de la précocité d'un légume-racine (Daucus).

Physiological indices are proposed in order to complete the morphological diagnosis of cultivated carrots. The progress of selection needs such improved varietal typization. The economical quotient or weight of root produced by 1 kg of leaves expresses the economic ability of the variety. The relative growth of foliage and root (allometry) is used to fix the precocity index and to represent the specific development of various cultigens. [ABSTRACT FROM AUTHOR]