Tendency micronutri Fe stimulates root development and flowering in cyclamen

15 November 2016

In collaboration with Cebeco – Horticoop, Prayon set up a trial to test the possibilities of micronutri Fe in a pot culture. At Demokwekerij Westland in The Netherlands the effects of iron polyphosphate fertilizer was studied on a cultivation of cyclamen, XL Pure White F1 (Schoneveld Breeding).

The seedlings were planted 17/06/2016 in 12 cm pots. After five weeks final pot density was increased to 15 pots/m2. Standardly two recipes were given. The generative recipe contained more potassium and sulfates, less ammonia but more nitrates. In the reference object iron was dosed in its chelated form DTPA. In the object grown on micronutri Fe plants receive iron as the inorganic salt iron polyphosphate. The total nutrient balance was kept equal between the two objects.

During the trial plant growth and flower development were monitored every two weeks. Leaf and soil analysis were carried out twice; after two weeks of growth and at the end of the trial. Flower quality was finally screened one day after irrigation was stopped. The results show that micronutri Fe can perfectly replace DTPA in a feed recipe for a pot culture as cyclamen.

Polyphosphates seem to have a positive effect on root development. Roots of plants grown on micronutri Fe developed significantly faster, especially after a stress situation with high temperatures as observed in August. Yellowing of the plants did not occur in both objects indicating iron was abundantly present to be taken up by the plants. Leaf color was defined as healthy with high market value. Leaf analysis show nutrients were sufficiently or even better taken up by the plants when dosing micronutri Fe. There were no differences in length of the leaves or diameter of the rosettes.

Homogeneity of plants grown on DTPA and grown on micronutri Fe was marked with 7.8 res 8.0 on a maximum of 10. When flowering was screened at the end of the trial no differences between the two objects were observed. The speed of flowering may be influenced positively by micronutri Fe as there were (little) more flowers opened during the last rating.

The number of plants without flowers was lower when using micronutri Fe indicating polyphosphates may stimulate flower induction. However both tendencies were not statistically proven in this trial. Wilting symptoms occurred simultaneously in the reference as in the object fed on polyphosphates.