As a rapidly developing science and technology, plant growth regulators have been widely used in agriculture, forestry, fruit and vegetable production.

In recent decades, plant growth regulators have been mixed in many applications, such as rooting, fruiting, dwarfing, dormancy, drying, defoliation, ripening, sweetening, coloring, etc., with rapid development momentum,

The reason is that the compound application can have the effect of synergism and addition, which can reduce the amount of use and improve the application effect. At the same time, it can also expand the scope of application, learn from each other, overcome the shortcomings of single use, and achieve high quality and high yield.

Commonly used plant growth regulators can be divided into: plant growth regulators and fertilizer, plant growth regulators and fungicides.

1、 Complex of plant growth regulators

In the past, it was believed that plant growth regulators have specificity and cannot be used in combination. However, modern plant physiology research has proved that different plant growth regulators will produce unexpected good effects when used in combination.

After the combination of growth promoter and growth inhibitor was used, it was found that some plants could inhibit the vegetative growth and promote the reproductive growth. While the plants controlled the exuberant growth and lodging resistance, the fruit would expand, increase the yield and improve the quality.

1. Sodium nitrophenol+sodium naphthylacetate

It is a new compound plant growth regulator with labor saving, low cost and high quality. As a regulator that can comprehensively adjust the balance of crop growth, sodium nitrophenolate can comprehensively promote crop growth, and is compounded with sodium naphthylacetate,

On the one hand, it can strengthen the rooting effect of sodium naphthylacetate, on the other hand, it can enhance the rooting quick-acting effect of sodium nitrophenolate. Together, the two can make the rooting effect faster, absorb nutrients more powerful and more comprehensive, accelerate and promote the expansion of crops, without lodging, strong internodes, more branches and tillers, disease resistance and lodging resistance.

According to the joint test and research of several scientific research institutions, the compound of sodium nitrophenolate and sodium naphthylacetate in proportion of 1:3 was applied to rootstock rooting. The results showed that the rooting number was significantly higher than that of sodium naphthylacetate alone;

The experimental study on soybean showed that both of them significantly promoted the root of soybean to be strong, and the ability of nitrogen-fixing bacteria in rhizobium was significantly enhanced, which showed obvious visual effect in 2-3 days;

The results showed that the yield of wheat could be increased by about 15% by spraying 2-3 times of the mixture of sodium dinitrophenol and sodium naphthylacetate at the rooting stage, with no adverse effect on wheat quality.

2. DA-6+ethephon (or sodium nitrophenolate+ethephon)

It is a kind of dwarf, robust and anti-falling regulator for compound corn. The use of ethephon alone has the effect of dwarfing, and the leaves are widened, dark green, upward and secondary rooting are increased, but the phenomenon of premature leaf senescence is easy to occur.

Using DA-6+ethephon compound agent to control the growth of corn, the compound use can reduce the plant by up to 20% compared with using ethephon alone, which has obvious synergistic and anti-premature aging effects.

3. Sodium nitrophenolate+gibberellin

As the quick-acting regulator, sodium nitrophenolate and gibberellin can both act in a short time after application, so that crops show good growth effects. However, sodium nitrophenolate and gibberellin are used in combination, according to the study on the application of sodium nitrophenolate by Zhongmu Jujube Science Research Institute,

At the same time of adding the two effects, the sustained effect of sodium nitrophenolate can compensate for the deficiency of gibberellin. At the same time, through comprehensive control of the growth balance, it can avoid the damage to the plant caused by excessive use of gibberellin, so as to significantly increase the yield and improve the quality of jujube trees.

4. Sodium naphthylacetate+indole butyrate

It is a widely used compound rooting agent in the world, and is widely used in fruit trees, trees, vegetables, flowers and some ornamental plants.

The mixture can be absorbed by roots, leaves and germinated seeds, stimulate the cell division and growth of the inner sheath of the root, make the lateral root grow faster and more, improve the ability of the plant to absorb nutrients and water, and achieve the overall growth of the plant.

Because of the synergism or synergism of the agent in promoting plant cutting and rooting, some plants that are difficult to root can also cut and root.

2、 Compound of plant growth regulator and fertilizer

1. Sodium nitrophenol+urea

Sodium nitrophenolate+urea is the "golden partner" in the combination of regulator and fertilizer.

In terms of effect, the characteristics of comprehensive regulation of crop growth and development of sodium nitrophenolate can make up for the deficiency of nutrient demand in the early stage, making the crop nutrition more comprehensive and urea utilization more thorough;

In terms of action time, the quick-availability and persistence of sodium nitrophenolate combined with the quick-availability of urea can make the plant appearance and internal changes faster and more lasting;

In terms of the method of action, sodium nitrophenolate and urea can be used together as both base fertilizer and root spray and flush fertilizer, which can be described as "killing three birds with one stone".

In the experiment of compound nitrophenol sodium and foliar fertilizer containing urea, the leaves of the plant became dark green and shiny within 40 hours after application, and the yield in the later stage was significantly increased.

2. Triacontanol+potassium dihydrogen phosphate

Triacontanol can increase the photosynthesis of crops, and it can be sprayed with potassium dihydrogen phosphate to improve the yield of crops. The combination of the two can be applied to the corresponding crops with other fertilizers or regulators, and the effect is better.

For example, the combination of triacontanol+potassium dihydrogen phosphate+sodium dinitrophenol can increase yield by more than 20% compared with the former two.

3. DA-6+trace elements+N, P, K

Hundreds of test data and market feedback information on the compound application of DA-6 with large and trace elements show that DA-6+trace elements such as zinc sulfate;

DA-6+large amount of elements, such as urea, potassium sulfate, etc., make the fertilizer play a role dozens of times higher than that of single use, and enhance plant disease resistance and stress resistance.

4. Chlormequat+boric acid

The application of the mixture on grapes can overcome the deficiency of chlormequat. The experiment showed that spraying the whole plant with a certain concentration of chlormequat 15 days before the flowering of grapes can greatly increase the yield of grapes, but reduce the sugar content of grape juice.

The mixture can not only play the role of controlling the length and promoting the fruit setting to increase the yield, but also overcome the side effect of reducing the sugar content after the use of chlormequat.

3、 Plant growth regulator+fungicide

1. Sodium nitrophenolate+allicin

The compound use of sodium nitrophenolate and allicin can significantly improve its efficacy, delay the emergence of drug resistance, and can resist the drug damage caused by excessive or high toxicity by regulating the growth of crops, and make up for the losses caused thereby.

The experimental study on the control of cotton verticillium wilt with sodium dinitrate+allicin EC showed that the incidence rate of sodium dinitrate was 18.4% lower than that of allicin alone,

Moreover, the compound preparation treatment is stronger than the control cotton in growth, dark green and thick leaves, and the late decline time is later, and the leaf function period is prolonged.

2. Sodium nitrophenolate+carbendazim

The mixture of sodium dinitrophenol and bactericide improves the surface activity of the agent, increases the permeability and adhesion, and thus increases the bactericidal effect.

The compound use of sodium nitrophenolate and heterocyclic fungicides, such as carbendazim, in the prevention and control of peanut leaf disease, spray twice at the beginning of the disease, improve the control effect by 23%, and significantly enhance the bactericidal effect.

4、 Plant growth regulator+herbicide

Ethephon+paraquat (now a national prohibited product)

Used as defoliant for crops. This agent can increase yield when used as a drying and defoliating agent for sesame. The effect of drying and defoliating is poor when only ethephon is sprayed 6 days before sesame harvest,

Sesame does not increase yield. Although paraquat alone has a good effect on drying and defoliation, it does not increase yield. If the two are mixed, it not only shows a good effect on drying and defoliation, but also increases its yield compared with the control.

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