Background and overview[1][2]
With the increase in population and the improvement of people’s living standards, the rigid demand for agricultural products is increasing year by year. With the current reduction of cultivated land area, the yield per unit area of crops and the quality of agricultural products must be improved. In the past six years, plant growth regulators have been increasingly used in my country, and the demand has been increasing year by year. Thidiazuron was announced to be synthesized by the German Schering Company in 1976. It was found that it can induce cotton defoliation. After being absorbed by the plant, it can promote the natural formation of the separation tissue between the petiole and the stem and then fall off. It is used as a defoliant in cotton planting.
Structure
Mechanism of action [3]
Thiazuron (TDZ) has extremely strong biological activity, and its ability to induce plant cell division and tissue calligraphy is hundreds of times higher than that of general cytokinins. It can relieve gene repression, open the codes of DNA and RNA, trigger the synthesis of relevant enzymes and proteins, coordinate the secretion of endogenous plant hormones, and induce and activate the expression of plant SAR (systemic resistance) genes. Thidiazuron (TDZ) can be widely used in various vegetables. It can preserve flowers and fruits, reduce fruit drop, and solve the problem of difficulty in fruit setting of vegetables in protected areas. It can greatly increase yields; it can improve the quality and commerciality of vegetables; it can enhance their It has disease resistance and stress resistance and has a certain preventive effect on certain pests of vegetables in protected areas; it is environmentally friendly and is a green pesticide.
Apply[4]
thidiazuron (TDZ) is a plant growth regulator with dual functions of auxin and cytokinin. It is widely used as a defoliant in cotton cultivation in my country, and as a fruit-setting agent in melon cultivation to replace pollination. is widely used. Thidiazuron preparations have the following effects on vegetables:
1. Cucurbitaceae
1. Zucchini: Spray the whole plant during the sitting period, which can replace artificial pollination and no longer use 2,4-D or anti-falling agents to spot flowers. It promotes melon setting, prevents melon from turning, makes it grow quickly, has no deformity, is fresh and tender, and has good commercial properties. It can also enhance its disease resistance, significantly reduce the occurrence of gray mold, and increase production by about 70%.
2. Cucumber: It can improve the survival rate of grafting and transplanting, enhance its disease resistance, and promote growth; it can promote melon setting and reduce the deterioration of melons caused by gray mold and high and low temperatures. The melon strips develop quickly, are fresh and tender, and are of good quality; they can relieve flower topping caused by low temperatures; when mixed with fungicides, they can improve the bactericidal effect, greatly reduce the use of pesticides, and save costs.
3. Melon: It can improve transplant survival rate, promote growth and development, and improve disease resistance. Spraying female flowers can promote melon setting, increase single melon weight, and increase total sugar content. If the young melon is skewed during development, it can be corrected by spraying it. Increase production by more than 50%.
2. Solanaceae
1. Tomatoes: It can improve transplant survival rate and promote rooting and growth. Continuous use after the second fruit set can promote fruit growth, reduce deformed fruits, no hollow fruits, increase single fruit weight, uniform fruit size, early maturity, and good commercialability; and can improve disease resistance (such as early blight, late blight) ), can also inhibit the occurrence of lateral buds.
2. Eggplant: It can improve the survival rate of transplanting and promote rooting and growth. Started to use after fruit setting, it can prevent flower and fruit drop, increase single fruit weight, reduce deformed fruits, make eggplant grow fast and fresh, increase single fruit weight, and increase yield by more than 30%.
3. Chili pepper: This product has a particularly significant effect on chili pepper. It can improve transplant survival rate, promote rooting and growth, and improve disease resistance. Used after the first flowers and fruits are set, it can inhibit excessive growth, increase the fruit setting rate, promote the rapid growth of peppers, increase the weight of single peppers, and increase the yield by more than 50%.
3. Legumes (frame beans, cowpeas, snow peas): used in the seedling stage to promote rooting and growth. Used after the beginning of flowering, it can promote fruit setting, rapid silique development and significant growth effect, and can delay aging and inhibit the occurrence of leaf spot disease.
4. Leeks: Using this product after leeks are unearthed can promote their rapid growth, thicker stems, thick and tender leaves, and no dry tips. It can increase the yield by 100%, and it also has the effect of resisting leek maggots.
5. Celery: This product is particularly effective on celery. Use after transplanting and after slowing down seedlings. It can make celery grow quickly, the stems contain less cellulose, be fresh and tender, and have no yellow leaves or heart rot. There is almost no disease and the yield increases by more than 50%.
Six, ��Garlic: Use it to soak seeds and then sow them. They will grow quickly and have no disease. Used after turning green the next year, the garlic sprouts can be tender, thick, and long, and the garlic will be large, achieving a double harvest of garlic sprouts and garlic.
This product has a strong promoting effect on the growth of green onions, potatoes, day lilies, strawberries, etc., and the effects can reach a significant level. It is also widely used in various vegetables.
Preparation [2]
The preparation method of thidiazuron is as follows:
① Add 50.5g of the reactant 5-amino-1,2,3-thiadiazole (0.5mol) to 200ml of the solvent butanone while stirring, and continue stirring for about 10 minutes until 5-amino-1, 2,3-thiadiazole is completely dissolved.
②Add 64g of reactant phenyl isocyanate (0.53mol) and 0.5ml of catalyst triethylamine (0.003mol) into the solution, at a temperature of 60~65℃ Make a catalytic synthesis reaction of 5-amino-1,2,3-thiadiazole and phenyl isocyanate. The reaction time is 3h, then cool to 20℃, and stir for another 1h to react. Completely, 102g of the target product thidiazuron was obtained by filtration, and the mother liquor was recovered (dried and applied), the yield reached 92.7%, and the product purity reached 98.5%.
Main reference materials
[1] CN201210295106.X Thidiazuron water-dispersible granules and preparation methods and applications
[2] CN200810157079.3 Preparation method of thidiazuron
[3] To increase vegetable production and quality, please use Yiguoling brand Thidiazuron
[4] Effects of plant growth regulator thidiazuron on the quality of melons
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