GROWTH INHIBITOR ACCUMULATES IN THE NUTRIENT SOLUTION OF CLOSED SYSTEM ROSE CULTIVATION

The circulating solution was collected and analyzed for its nutrient concentration. Three types of solutions were prepared for the bioassay. One was the circulating nutrients solution. Activated charcoal was added to second solution. The third solution was prepared to the analyzed formula of nutrients solution using distilled water. The rooted cuttings of rose were planted in each solution and incubated in the growth chamber. The rate of change of fresh weight before and after the incubation was biggest for the prepared solution, which does not include the circulating solution. The fresh weight growth rate was smallest for the circulating solution, and the results for the activated charcoal treatment was between them. Since the activated charcoal does not have a sterilization effect, it is possible that the growth inhibitors accumulated in the solution during the circulating cultivation of roses.