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Plantas de duas formas botânicas de Catharanthus roseus, de flores lilases e de flores brancas foram cultivadas em soluções nutritivas deficientes em N, P, K, Ca, Mg, S e B, e em solução completa, a fim de se obter o quadro sintomatológico das deficiências, assim como os níveis analíticos de nutrientes nas folhas, caules, raízes e flores. Manifestaram-se sintomas de deficiência claros para todos os nutrientes estudados. Nas plantas de flores lilases, as concentrações de nutrientes na matéria seca de folhas de plantas normais e deficientes foram, respectivamente, para cada nutriente estudado: N(%): 3,53-1,20; P(%): 0,35-0,11; K(%): 2,45-0,76; Ca(%): 1,77-0,81; Mg(%): 0,55-0,46; S(%):0,21-0,12; B(ppm): 382-37. Nas plantas de flores brancas, estas concentrações foram: N(%): 3,78-0,92; P(%): 0,38-0,09; K(%): 2,60-0,86; Ca(%): 1,37-1,15; Mg(%): 0,56-0,44; S(%): 0,10-0,07; B(ppm):372-39.Plants of two botanical forms of Catharanthus roseus, with pink and white flowers, were cultived in nutrient solutions, complete or lacking one of the following elements: N, P, K, Ca, Mg, S and B. Clear deficiency symptoms were observed for all the elements and they were comproved by chemical analysis of leaves. Chemical composition of leaf matter of normal and deficient pink flowered plants were, respectively, for each of the studied elements: N(%): 3.53-1.20; P(%): 0.35-0.11; K(%)2.45-0.76; Ca(%): 1.77-0.81; Mg(%): 0.55-0.46; S(%): 0.21-0.12; B(ppm): 382-37. For plants with white flowers, these values were: N(%): 3.78-0,92; P(%): 0.38-0.09; K(%): 2.60-0.86; Ca(%): 1.37-1.15; Mg (%): 0.56-0.44; S(%): 0.10-0.07; B(ppm): 372-39

anais da escola superior de agricultura luiz de queiroz

Nutrição mineral de plantas ornamentais XI: deficiências de macronutrientes e de boro em Catharanthus Roseus (L.) G. Don e Catharanthus roseus f. albus (sweet) G. Don