Two experiments were carried out in the Horticulture Department, Faculty of Agriculture, Suez Canal
University on Schefflera, Dodonaea and Cordyline plants during the successive seasons from 2014 to 2017. The
objective was to study the effect of nitrogen fertilization at 100, 150 and 200 ppm interacted with magnesium at 50, 75
and 100 ppm with other nutrients on increasing the efficiency of plants to reduce pollutants and raising efficiency in
reducing formaldehyde from closed chamber. The results showed that the best treatments were the plants fertilized with
200 ppm N and 75 ppm Mg for formaldehyde reduction using by Schefflera actinophylla, Cordyline terminalis and
Dodonaea viscosa. The rate of reduction in these treatments over control ranged from 350%-725% for Schefflera,
275%-630% for Cordyline and 300%-400% for Dodonaea, respectively.