Abstract

Foliar application supply micro and macronutrient is a common praclíce in several crops. However, in guava (Psidium guajava L.) efficiency of this procedure has been low. An anatomical approach was made to understand this problem by light and scanning electrón microscopy of guava’s leaves, which revealed: (a) the hypodermis under the adaxial epi­dermis is formed by three layers of cells with thickened cell walls; (b) well-developed palisade parenchyma; (c) high density of stomata and trichomes at the abaxial epidermis; (d) absence of stomata on the adaxial surface. Such partners reveal a typical water saving mechanism, which probably interferes with the absorption of nutrients applied by foliar spraying.