the graphical tracking method is based on a static sigmoid curve to determine the progress towards desired plant height
the actual growth is then compared with the predicted curves
plant growth regulators (PGRs) such as chlormequat, daminozide or paclobutrazol are commonly used in this respect to control shoot elongation
However, due to the potentially negative effects of PGRs on human health and the environment their use is becoming restricted and desirable to phase out
In addition, application of PGRs is time-consuming
In northern areas temperature drop treatments in the morning are commonly used in combination with PGRs to reduce elongation growth
However, use of such temperature drops is limited by periods of high temperatures and high solar radiation in early autumn as well as energy-saving regimes in semi-closed or closed greenhouses
As an alternative, exploiting the responses of the plants to different light qualities provides an interesting possibility in greenhouse production of poinsettia