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Revista mexicana de ciencias agrícolas

versão impressa ISSN 2007-0934

Resumo

HERNANDEZ-PEREZ, Armando et al. Tolerance of lisianthus (Eustoma grandiflorum (Raf.) Shinn) to high ammonium concentrations in nutrient solution. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.3, pp.467-482. ISSN 2007-0934.

Lisianthus (Eustoma grandiflorum (Raf.) Shinn) is an ornamental species grown to produce cut flowers or potted plants and has a trade potential for its variety of colors. The use of soilless cultivation technology in ornamental species allows defining and clarifying the demand and optimal levels of nutrition. The present study aimed to evaluate the effect of the relationship NO3-: NH4+ in the nutrient solution, keeping constant total concentration of nitrogen to define the maximum tolerance to NH4+ in function of the phenological stage. The solutions under study consisted on four ratios of NO3-: NH4+: 100: 0, 75:25, 50:50 and 25: 75%. Most variables responses allowed defining an optimal ratio of NO3-: NH4+ between 75:25 and 50: 50% in vegetative and reproductive stage, interval that in most plant species would be toxic at these levels of NH4+. This was observed in parameters such as plant height, stem diameter, leaf area and total dry weight of plant. Excessive concentration of NH4+ (75%) caused a reduction in plant height, flower diameter, and total dry weight of plant. The increase in ratio of NH4+ was associated with increased concentrations of N, P, K, Ca and Mg in leaf and stem, but in flower was less marked for K and Mg. The extraction of these macronutrients showed the same trend.

Palavras-chave : nitrate /ammonium; nutrition; nutrient solution; ornamental; tezontle; toxicity.

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