Preliminary DRIS norms and sufficiency range for 'Paluma' guava tree/Normas preliminares DRIS e faixas de suficiencia para goiabeira 'Paluma'

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.sup.-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.sup.-1]) for the micronutrients B, Cu, Fe, Mn and Zn, respectively. The yield of guava was related to nutritional status. Index terms: Psidium guajava; nutritional state; nutritional diagnosis. O diagnostico nutricional a partir da analise do tecido foliar e um instrumento eficiente para detectar desequilibrios e auxiliar no processo de recomendacao de adubacao. Assim, objetivou-se avaliar a relacao entre os indices DRIS e os teores foliares de nutrientes, estabelecer teores foliares adequados de nutrientes com o DRIS e validar normas DRIS para a goiabeira 'Paluma'. Avaliou-se um pomar comercial nas condicoes de cultivo do Estado de Sao Paulo, durante seis safras de producao de frutos, provenientes de ensaios de adubacao organica e mineral, totalizando 168 amostras. A ordem dos nutrientes limitantes por falta em ordem decrescente foram: Fe > K > Mn > Ca > B > N > P > Cu > S > Mg > Zn, e limitantes por excesso em ordem decrescente foram: Cu > Fe > P > Mn = Mg > Zn > Ca > B > K > S > N. As faixas adequadas, provenientes dos indices DRIS, sao: 18-21; 1,5-1,7; 15-17; 8-11; 1,8-2,5 e 2,5-2,9 (g [kg.sup.-1]) para os macronutrientes N, P, K, Ca, Mg e S, respectivamente, e 26-38; 5-57; 54-112; 53-101 e 13-126 (mg [kg.sup.-1]) para os micronutrientes B, Cu, Fe, Mn e Zn, respectivamente. A produtividade das goiabeiras esteve associada ao estado nutricional. Termos para indexacao: Psidium guajava; estado nutricional; diagnostico nutricional.