As a rapidly developing science and technology, plant growth regulators have been widely used in agriculture, forestry, fruit and vegetable production. In recent decades, the mixing of plant growth regulators has emerged in many applications such as rooting, fruiting, dwarfing, dormancy, drying, defoliation, ripening, sweetening, coloring, and so on, and the development momentum is rapid. The reason is that the combination 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 also expands the scope of application, learn from each other, and overcome the shortcomings of single use, It can also 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. When combined 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 efficiency of sodium nitrophenolate. Together, the two can make the rooting effect faster, absorb nutrients more powerful and more comprehensive, and accelerate the promotion of crop stretching and strong, not lodging, strong internodes, increased branches and tillers, and disease resistance, Resistance to lodging. 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, both sodium nitrophenolate and gibberellin can act in a short time after application, making the crops show good growth effect. However, when sodium nitrophenolate and gibberellin are used in combination, according to the research on the application of sodium nitrophenolate by the Jujube Science Research Institute, while adding the effects of the two, the characteristics of sodium nitrophenolate's persistence can make up for the deficiency of gibberellin, and at the same time, it can comprehensively control the growth balance, Avoid excessive use of gibberellin to cause damage to the plant, so as to significantly increase the yield and quality of jujube trees.

4. Sodium naphthylacetate+potassium indobutyrate

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. The good combination selected from a large number of tests, plus certain additives, will be provided to customers, which will greatly benefit customers.

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 emulsion showed that the incidence rate of sodium dinitrate was 18.4% lower than that of allicin alone, and the compound preparation treatment was stronger than the control cotton, with dark green and plump leaves, late decline time, and extended the leaf function period.

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.

3. Brassinolide+triadimefon

Brassinolide can promote the germination and seedling growth of crops, trees and seeds, and improve the stress resistance of crops. According to relevant literature, the control effect of brassinolide and triadimefon on cotton bacterial wilt was more than 70%, and it also promoted the growth of cotton roots and buds. The study also showed that salicylic acid also had obvious synergistic effect on triadimefon.

4、 Plant growth regulator+herbicide

1. Ethephon+paraquat

Used as defoliant for crops. This agent can increase the yield of sesame when used as a dry defoliation agent. Six days before sesame harvest, the dry defoliation effect is poor and the yield of sesame is not increased by spraying ethephon alone. Although the dry defoliation effect is good, the yield of sesame is not increased by using paraquat alone. If the two are mixed, not only the dry defoliation effect is good, but also the yield is increased compared with the control.

Compound technology of other plant growth regulators

1. Rooting agent: It mainly promotes the rooting and slowing of seedlings after transplanting, or the cutting of seedlings. The types are auxin+auxin, auxin+catechol, indoleacetic acid+naphthoic acid, auxin+saccharin, abscisic acid+auxin, fulvic acid+indobutyric acid, etc.

2. Fruit-setting agent: its function is to increase the rate of parthenocarpy, increase the single weight of fruit, promote fruit setting, accelerate the expansion speed of fruit, and increase the size of fruit. The types are gibberellin+cytokinin, gibberellin+auxin+6-BA, gibberellin+naphthoxyacetic acid+diphenylurea, gibberellin+phenylpeptidase, gibberellin+brassinolide, gibberellin+naphthoxyacetic acid+microelement, etc.

3. Inhibitory fruit setting agent and grain yield increasing agent: the function is to control the growth and increase the fruit setting rate. The types are respectively chlormequat+choline chloride, chlormequat+ethrel, ethrel+abscisic acid, chlormequat+ethrel+copper sulfate, chlormequat+pyrimidine, chlormequat+gibberellin, abscisic acid+gibberellin, etc.

4. Breaking dormancy and promoting growth agent: its function is to break dormancy and promote germination. Its types include gibberellin+thiourea, potassium nitrate+thiourea, benzylaminopurine+naphthoic acid+nicotinic acid, gibberellin+KCl, gibberellin+Fospinol, etc.

5. Drying and defoliating agent: mainly used for sesame, cotton, etc., drying and defoliating before mechanical harvesting. Its function is not only to dry and defoliate, but also to increase the yield. Its types include Ethyl+Paraquat, Thiazolon+methamidophos, Thiazolon+potassium carbonate, Ethyl+ammonium persulfate, Thiazolon+Diuron, Ethyl+chlordoxol+actinomycin, etc.

6. Accelerating ripening, coloring and improving quality agent: it can accelerate the ripening of fruit, make the color bright, and increase the sweetness of fruit. Its types include Ethyl+Propylene, Ethyl+Cyclodextrin complex, Ethyl+2,4,5-alpropionic acid, Diuron+Citric acid, Benzaminopurine+Chunleimycin, etc.

7. Vegetable and fruit picking agent: It is applied before the apple and citrus ripen quickly, which promotes the formation of the separation layer at the base of the citrus fruit stem, thus leading to the separation of fruit and branches. Its types include: naphthalene acetamide+acetonitrile, dinitro-cresol+naphthalene acetamide+acetonitrile, naphthalene acetamide+carbaryl, dinitro-cresol+naphthalene acetamide+carbaryl, and naphthoic acid+carbaryl.

8. Promote flower bud development, flowering and sex ratio: transform fruit crops from vegetative growth to reproductive growth, and promote flowering. Its types include naphthoic acid+benzylaminopurine, benzylaminopurine+gibberellin, gibberellin+silver sulfate with sulfur, ethephon+potassium dichromate, etc.

9. Bud inhibitor: It can inhibit the germination of axillary buds on tobacco and potato during storage. Its types include cyanogen+bud inhibition, chloranilide+anilide, sucrose fatty acid ester+cyanogen, etc.

10. Growth promoting and yield increasing agent: improve the absorption of N, P and K by plants and increase the yield. Its types include indoleacetic acid+naphthylacetic acid, indoleacetic acid+naphthylacetic acid+2,4-D+gibberellin, protocin+cytokinin+auxin, hydrogen peroxide+xylic acid, etc.

11. Stress resistance agents (drought resistance, low temperature resistance, disease resistance, etc.): increase the absorption of nutrients, promote the growth of seedlings, increase the total dry matter, improve cold resistance, drought resistance, disease resistance and insect resistance. Its types include anti-kinetin+abscisic acid, cytokinin+auxin+gibberellin, ethrel+gibberellin, salicylic acid+gene activator, etc.

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