Variation in content of macronutrients of guava tree leaves, in function of type and time of storage

Abstract

Leaf analysis for perennial crops such as the guava tree is an important tool. It was used to evaluate the influence of the type of packaging (with or without refrigerator) and storage time after collection on the macronutrient composition of guava tree leaves. The leaf sampling was carried out on a commercial guava tree (cv. Paluma), collecting the third pair of recently matured leaves in full bloom. The experimental design was in randomized blocks, subdivided according to the type of packaging (with or without refrigerator) and further subdivided into eight storage times before washing (zero, 6, 12, 24, 48, 72, 96 and 168h after sampling), with four replications. The storage time significantly affected the concentration of leaf nitrogen, calcium and sulfur. Moreover, the type and time of conditioning (with or without refrigerator) affected only the magnesium. In general, storage fot up to 12h before washing produced no significant changes in the levels of macronutrients.

Keywords

• Análise foliar
• Conservação da amostra
• Psodium guajava