Resumen

TORRES-OLIVAR, Vicente et al. Response or poinsettia (Euphorbia pulcherrima Willd ex Klotzsch) to nitrate:calcium ratio in three phenological stages. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.spe12, pp.2345-2357. ISSN 2007-0934.

In the present work was determined the effect of the relationship NO3-: Ca2+ in nutrient solution on growth and quality of poinsettia in three phenological stages (root growth, vegetative development and pigmentation). The experiment was conducted in the experimental field of the Faculty of Agricultural Sciences at the Universidad Autonoma del estado de Morelos, Cuernavaca, Morelos. From the universal Steiner nutrient solution, three concentrations of NO3-: Ca2+ were studied designed from modifying the concentration of NO3- based on the ratio NO3- + H2PO4- + SO42-, 12:1:7 ( mol(+) m-3) and Ca2+ at ratio K + + Ca2 + + Mg2+, 7:9:4 (mol(+) m-3). The results showed that at root growth is possible to decrease the concentration of NO3- from 12 to 10 mol (+) m-3 and Ca2+ from 9 to 7 mol(+) m-3, without affecting the growth of poinsettia, while in vegetative development NO3- must be maintained at 10 mol (+) m-3 and increase Ca2+ from 7 to 9 mol(+) m-3. During the pigmentation stage the best response of plants was obtained with 10 mol(+) m-3 NO3- , while Ca2+ must remain the same as than in the vegetative development (9 mol(+) m-3).

Palabras llave : anions; cations; mutual relations; nutritional balance; nutrient solutions.