Daminozide is a broad-spectrum growth retardant that can be used as a dwarfing agent, fruit setting agent, root agent, and preservative. Its function is to prevent cell division, inhibit cell elongation, dwarf seedlings, and improve crop drought resistance, make many crops bloom early, increase fruit setting rate and prevent pre-harvest fruit drop.
Mechanism of action
After being absorbed by plants, Daminozide can inhibit the biosynthesis of endogenous gibberellins and the synthesis of endogenous auxins in plants. Its main function is to inhibit the growth of new branches, shorten internode length, increase leaf thickness and chlorophyll content, prevent flower drop and promote fruit setting, induce adventitious root formation, stimulate root growth, and improve cold resistance. Daminozide enters the body through plant roots, stems, and leaves. It has good systemic absorption and conduction properties and is conducted to the site of action along with the nutrient flow. In leaves, daminozide can elongate the palisade tissue of the leaves, loosen the spongy tissue, increase the chlorophyll content, and enhance the photosynthesis of the leaves. At the top of the plant, it can inhibit the mitosis of the apical meristem. In the stems and branches, it can shorten the internode distance and inhibit the elongation of the branches. Daminozide is a plant growth regulator with broad spectrum and applicability.
Efficacy
1. Delay the vegetative growth of plants, make the leaves dark green, small and thick, the plants compact and sturdy, the root system is well developed, increase the root dry weight and reduce the crown-root ratio, which is beneficial to control the elongation or flower bud differentiation.
2. Increase the chlorophyll content of crops, delay the aging of chloroplasts, slow down the growth rate, and increase the photosynthetic net assimilation rate, which is beneficial to increase the accumulation of dry matter, improve the quality, hardness and fruit setting rate of fruits, and promote the concentration of fruit maturity.
3. Increase the sugar content in plant cells, reduce energy consumption, reduce transpiration, etc. This may be related to daminozide's ability to improve plant resistance to adverse environments and help reduce physiological diseases.
4. Decolorization. Daminozide can be quickly decomposed by microorganisms in the soil.
How to use
Using daminozide can shorten the internodes of grape growth branches, deepen the leaf color, make the leaves small and thick, and increase chlorophyll. Daminozide is not as strong as daminozide in controlling the growth of new shoots of grapes, and at the same time, the time of the shoot inhibition effect is also slower. According to the test, the effect of using daminozide 200mg/L for rose-scented grapes is better, and the concentration should be increased to 2000-3000mg/L for grapes such as Kyoho and Kangke. The time for spraying daminozide is 7-10 days earlier than daminozide, and the spraying concentration is 2000-3000mg/L. The spraying concentration is determined according to the grape variety.
Note: When using daminozide, it is necessary to conduct experiments on local varieties before promoting it; Kyoho grapes were treated with 4000mg/L daminozide without phytotoxicity. When the new shoots of grapes have 6 to 7 leaves, spraying them with 1000mg/L to 2000mg/L daminozide once can inhibit the growth of new branches and increase yield. It can also be mixed with gibberellins to increase the proportion of seedless fruits, increase fruit hardness, and reduce the damage rate during transportation.
