Marcha de absorção de nutrientes, produção e qualidade de hastes florais de plantas de tango (Solidago canadensis L.)

With the purpose of characterizing the concentration and accumulation of nutrients on Canada Goldenrod leaves with different number of stems along a period, an experiment was driven on the greenhouse on the Floriculture Sector DFT/UFV, using the randomized block design, in factorial outline 3x7 (plants with one, two and three steams and collected in 0, 15, 30, 45, 60, 75 and 90 days). During the crop period, the plants where irrigated with nutritious solution, containing macronutrients (mmol/L): 3.6 N-NO3 -; 10.8 N-NH4+; 1.95 P-H2PO4-; 8.0 K+; 1.5 Ca2+; 1.0 Mg2+; 5.0 S-SO42- and micronutrients (µmol/L): 30.0 B; 5.0 Cu; 50.0 Fe; 40.0 Mn; 2.0 Zn; 0.1 Mo. The prune was made five days after the transplantation, and it consisted in the elimination of a centimeter of the plant apex. In each collect, the plants were separated in leaves, stems, inflorescences and roots. The following factors were evaluated, the number and length of the stems, dry and fresh matter weights of leaves and stems, number of leaves, leaf area, and the concentration and accumulation of N, P, K, Ca, Mg, S, Fe, Cu, Zn, Mn and B on the leaves. The pruning caused an increase on the production of the stems, and the length of the stems was in the standards required by the market for every treatment system. The production of dry and fresh matter of the plants with one, two and three stems was similar, and the fresh matter production of the plants with three stems was within the standards established for commercialization. The concentrations of the nutrients in the leaves decreased in the crop period depending on the dilution according to the earning of dry matter and the translocation of nutrients from the old organs to the growing tissues, except for Mn which had increasing concentrations throughout the entire period. There were no observations of deficiency and toxicity symptoms depending on the macro and micronutrients on the Goldenrod leaves. The accumulation on the leaves changed along with the growing curves, and it increased during the whole period following this order: K>N>Ca>Mg>P>S for macronutrients and Mn>Fe>B>Zn>Cu for micronutrients.

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