Promalin a growth regulator which is made from two chemical components. The first is a mixture of gibberellins GA4 and GA7. Both types of gibberellin occurs naturally in apple seeds, young leaves and buds on roots and shoots that grow actively. In plant growth, both of these substances play a role in cell elongation during the growth of flower buds, and there with other plant hormones in seeds and shoots that are quiet and dormant.
The second component is a 6-benzyladenine, a cytokinin that is naturally found in the buds and shoots actively growing roots, and on young fruit. Cytokinin intensified the division of cells and with other hormones affect the differentiation of cells that determines whether cells will be a leaf, stem, fruit or other parts.
Increase the Number of Fruits and Intensifying Branch
Promalin increase the number of cell divisions at the end of the calyx of fruit, which increase the distinctiveness of the fruit. The most active cell division occurs soon after pollination and gradually decreased until about 28 days after flowering. At that time, men have had about all the necessary cells. Twenty-eight days after flowering, the cells enlarge, add weight and size of fruit. Use promalin gives the best effect if the selected time in the early period of cell division that is now flowering.
This growth regulator may also increase the number of side branches and the development of short branches. But this is only useful for young trees, not to produce and healthy. In addition to causing high growth rates which are necessary to encourage branching, a component of the growth of gibberellin from promalin negate flower buds.So that this technique may not be used for trees that have produced fruit.
Plants that are treated with promalin have larger leaves, up to now unknown benefits of the enlarged leaf.
Other effects commonly associated with the use of promalin flowers that produce fruit.One year after treatment, trees that have been treated with promalin generate little interest to the fruit. Apparently this is caused by an imperfect fruit thinning, spraying a bad calibration, low tree health, and growth is imposed.
Promalin can not work properly in the orchard of flowering in cold temperatures, which naturally produces a small fruit and more rounded.
Promalin should be used carefully with the appropriate dose. If this substance is given at the right time at the stage of cell division, fruit goal should be expected more with the typical form. The best results obtained if application is followed by good management and the selection of the right place too.
Source: Trubus - TH XXIV - JANUARY 1993