Paclobutrazol inhibits gibberellin formation Paclobutrazol is a highly effective plant growth regulator, which mainly acts by inhibiting the synthesis of gibberellin in plants. It can also increase the activity of rice acetal oxidase, reduce the level of endogenous auxin in rice, and significantly weaken rice. The growth advantage of the top of the seedlings promotes the growth of the lateral buds (tillers), so that the appearance of the seedlings is short and strong, the leaves are dark green and the roots are developed. It is used in wheat and rice seedlings to make seedlings short and strong. Paclobutrazol has a long-lasting effect, and it can still play a certain role in rice and wheat jointing after seed dressing. In the jointing stage, the inhibition of internode DNA elongation is also inhibited by inhibiting the formation of gibberellin in rice and wheat, and the internodes of rice and wheat are thick and short, thereby enhancing the lodging resistance of plants. During the germination of wheat and rice seeds, gibberellin is required to activate the activity of amylase, and the starch in the endosperm is converted into sugar for germ germination; germination of germ and seedling growth also requires gibberellin. Mixing rice and wheat seeds with paclobutrazol should not be too large, otherwise seed germination and seedling growth will be excessively inhibited, which is manifested by delayed emergence, decreased emergence rate and slow growth of seedlings. Mix the wheat with paclobutrazol, you can use 15% paclobutrazol wettable powder 20 ~ 25 grams, add appropriate amount of water to dissolve and mix 100 kg of wheat, mix well and pile up for 4 to 6 hours, dry and sow. Paclobutrazol seed dressing will delay the emergence of seedlings for 2 to 3 days, and should be properly planted early. Plate buckwheat, seedling wheat, etc. do not cover the seed or cover the seed shallow, it is not suitable to use paclobutrazol seed dressing, otherwise the wheat seedling root is not easy to tie down (physiological reason is the effect of paclobutrazol, the growth of auxin in wheat seedlings, top growth The advantage is weakened and the root tip is weakened to the ground). Can you mix the paclobutrazol with the wheat seed dressing? It depends on the active ingredients in the wheat seed dressing. In general, most of the wheat seed dressings used for sterilization are triazole drugs, such as triazolone; the main insecticides used for controlling underground pests are phoxim. The mechanism of triazole drugs such as triadimefon to inhibit diseases is to inhibit the activity of CytP450 monooxygenase in fungi, destroy the biosynthesis of ergosterol, and cause cell membrane damage and death. It can also inhibit the biosynthesis of gibberellin in plants. The C-14 demethylase CytP450 monooxygenase prevents the synthesis of gibberellin that promotes cell elongation. Seed dressing with triadimefon can prevent a variety of wheat diseases. This technology has been widely applied in production. However, when the dosage is too large, it will seriously inhibit the germination and emergence of wheat seeds. Therefore, it is generally not recommended to use triazole in production. Ketone seed dressing, and the use of Li Kexiu (2% tebuconazole wet seed dressing) and other agents. Tetraconazole has a wide spectrum of sterilization and low dosage. It can be applied to the seed treatment of wheat. It is also effective for all kinds of pathogens carried by seeds, whether it is adsorbed in the epidermis or inside the seeds, especially suitable for the prevention and control of smut. However, tebuconazole is also a triazole fungicide , which also inhibits the synthesis of gibberellin in wheat, but its inhibition is weak and relatively safe. Seed dressing with Likexiu can not be too large, and the seeding depth of seed dressing should be 2~5 cm. Through the above analysis, it can be known that if the wheat seed dressing contains triazoles such as triazolone, it is generally not advisable to add paclobutrazol seed dressing, otherwise it may cause excessive inhibition of wheat seedling growth, and the wheat emergence rate and seedling rate are seriously degraded. . In addition, from the action characteristics of triazole bactericides such as triazolone and the effect on wheat, seed dressing with such fungicides can reduce the level of gibberellin in wheat seedlings to a certain extent and inhibit the growth of apical growth. Advantages, promote the role of wheat seedlings. Spraying paclobutrazol in wheat seedling stage In the wheat seedling stage, if the wheat seedlings are found to have prosperous signs, they can be sprayed at a dose of about 50 kg of 100-150 mg/L paclobutrazol per acre in the 3 to 5 leaf stage of the wheat seedlings. If the seeding rate is high and the field wheat seedlings are too large, it is best to mix the paclobutrazol with mepazine (also known as melatonin, ketamine), or use a compounding agent of paclobutrazol and mepazine, such as Mai Yefeng. (20% multi-effect·Meiper microemulsion, containing 16.7% of meperidine, 3.3% of paclobutrazol, 90-120 grams of recommended drug per hectare, Beijing Bei Nong Tianfeng Pesticide Co., Ltd., contact number), Zhuangzhi 20% multi-effect·Methylpiper microemulsion, containing paclobutrazol 4%, mepazine 16%, recommended dosage of 90-120 grams per hectare of pure medicine, Henan Zhoukoushan Duli Chemical Co., Ltd., contact telephone) and other pharmaceuticals. Mepazine is a systemic growth retardant that inhibits the biosynthesis of gibberellin, inhibits cell elongation, delays vegetative growth, dwarfs plants, compacts plants, increases chlorophyll content, and enhances leaf assimilation. . Compared with the administration of paclobutrazol, the application of mepivazone has a lesser effect on promoting tillering of wheat, and application in a large population of wheat fields is advantageous in preventing the population of wheat from being excessively enlarged. In addition, the half-life of mepazine in the soil is short (10-97 days), the half-life of paclobutrazol in soil is longer (0.5 to 1 year), and the application of paclobutrazol in the wheat field is reduced and mixed with meperazine and paclobutrazol. The compounding agent helps to alleviate the possible adverse effects of paclobutrazol residues on the crops. The key to preventing lodging is to rely on cultivation management It is worth reminding that in large-scale production, it is mainly necessary to prevent wheat from lodging through reasonable cultivation measures. Do not blindly use growth regulators such as paclobutrazol (unfavorable for spike differentiation and development of wheat, which will cause the ear shape to become smaller and deformed), otherwise it will not be conducive to high yield. Production should first control the amount of wheat planted, reduce the basic seedlings, the amount of seed in different fields should generally be 4 to 10 kg (according to the growth time and accumulated temperature of wheat seedlings, different fertility levels, etc.), less application or If the green manure is not applied, it is generally necessary to wait for the first section of the wheat to be fixed in the first section and then to extract the jointing fertilizer in the second section to control the length of the two nodes at the base of the wheat. Others Steel Coils,St37 Hot Rolled Steel Coil,Cold Rolled Steel Coils Tongyun Pipe Industry Co., Ltd , http://www.lcsteelpipes.com