PRELIMINARY DRIS NORMS AND SUFFICIENCY RANGE FOR 'PALUMA' GUAVA TREE

The nutritional diagnosis based on the analysis of leaf tissue is an efficient tool for detecting imbalances and help the process of fertilization recommendation. Thus, it was evaluated to establish preliminary DRIS norms, and to derive critical levels and sufficiency ranges of nutrients in the leaf tissue to Paluma guava cultivar in commercial orchards growing conditions in the State of Sao Paulo. It was evaluated six harvests of fruit production, from organic and mineral fertilizer, totaling 168 samples. The order of limiting nutrients for failure in descending order were: Fe> K> Mn> Ca> B> N> P> Cu> S> Mg> Zn, and limiting excess in descending order were: Cu> Fe> P> Mn = Mg> Zn> Ca> B> K> S> N. The tracks from the appropriate DRIS indices are: 18-21, 1.5 to 1.7, 15-17, 8-11, 1.8 to 2.5 and 2.5 to 2.9 (g kg(-1)) for the macronutrients N, P, K, Ca, Mg and S, respectively, and 26-38, 5-57, 54-112, 53-101 and 13-126 (mg kg(-1)) for the micronutrients B, Cu, Fe, Mn and Zn, respectively. The yield of guava was related to nutritional status.