H. Will
The regulation of plant growth becomes more and more important. Chemicals for the stopping of plant growth are of special interest, because they have the ability to improve the quality of our plants.

In the Agricultural Research Station of the B.A.S.F. Limburgerhof we applied mainly CCC in the last years. The abbreviation CCC means Chlorocholinchloride. The modern name is chlormequat. From the chemical point of view CCC is an organic salt. The content of active substance is 41%.

The influence of CCC is already known from several plants, especially from wheat and ornamental plants. After the application of CCC the morphology changes in the following way:

The growth in height will be reduced. The quantity of cells will remain the same. This effect is due to the stopping of cell extension. The internodes become shorter without effecting the number of leaves, the diameter of the stalk will become thicker, resulting in an improved standing-ability.

After CCC application the plants show a better root development and higher root weight. This also improves the standing-ability of the plants and gives them resistance against drought. The influence of CCC on the leaf colour can be seen shortly after application. The change in colour is due to a higher chlorophyll-synthesis.

The flower formation is influenced in different ways; it can be sooner or it can be delayed. In several experiments the number of flower buds was higher after a treatment with CCC. Numerous plants showed a higher resistance against frost after a CCC treatment.

Physiologically the influence of CCC is connected with the production of gibberellin in the plant. After the application of CCC the gibberellin production will be blocked, by which the cell extension fails partly or completely.

Moreover, CCC reduces the auxin level in the plants by which mainly the etiolation will be prevented (especially during the time of the year with shortage of light).

Whether the different reactions of the various plants are connected with a certain limit is up to now unknown. Lignified plants show in many cases a better and longer reaction than herbaceous plants.

In the following the practical application of CCC to vegetable seedlings will be described. Corresponding research work was done since 1965. We mainly tried to prevent the seedlings getting tall and spindly, either in case of too narrow standing or through a delay of the planting-time. This is very important especially with the raising of seedlings during winter and spring months with their insufficient light conditions.

CCC can be applied over the soil or over the leaves. The application

Will, H. (1973). THE APPLICATION OF CCC TO VEGETABLE SEEDLINGS. Acta Hortic. 27, 254-257
DOI: 10.17660/ActaHortic.1973.27.31

Acta Horticulturae