Articles
THE INFLUENCE OF OSMOCOTE 16–10–13 IN ROOTING SUBSTRATE ON THE ROOTING OF POTENTILLA FRUTICOSA AND HYPERICUM CALYCINUM CUTTINGS
They were put into a mixture of peat-sand (2:1).
Osmocote 16–10–13 (9 month) was mixed into the substrate at the following rates; 0.5, 1.5, 3.0, 4.5, and 6.0 g per litre of substrate.
The control received no fertilizer.
The cuttings were rooted under mist.
After twelve weeks the parameters vegetative growth, mineral and starch content were measured.
In the case of the Hypericum cuttings, shoot growth and root dry weight was highest in the 3.0 g/l treatment.
Considering the number and the dry weight of new shoots, the optimal rate of Osmocote was 4.5 g/l.
The content of N, P, K and Mg increased and the starch decreased parallel with increasing Osmocote rates.
The Ca content remained constant.
The total plant height and the dry weight of shoots of Potentilla cuttings increased with the first three Osmocote rates and were constant at the two highest rates.
The number of new shoots and the contents of N, P and K increased but the dry weight of the roots and the starch content decreased with increasing rates of Osmocote.
The contents of Mg and Ca were constant.