In recent years, China's plant growth regulator industry has grown steadily. By the end of 2012, there were 272 plant growth regulator production enterprises, with an annual production and sales of about 100,000 tons, involving 75 crops and 56 uses. The annual production and application area is about 2 billion. Mu has formed an industrial chain from raw material supply, research, production, sales to promotion and application. It has broad development prospects and space, but there are still many problems in independent innovation, application guidance, scientific propaganda, supervision and management.
At the meeting, Tan Weiming, an associate professor of agronomy at China Agricultural University, pointed out that among the current formulation registration products, ethephon, sodium nitrophenolate, gibberellic acid and paclobutraz accounted for nearly half, of which the original medicines and preparation companies were mainly concentrated in In Jiangsu, Sichuan, and Henan provinces, foreign companies have fewer plant growth regulators registered in China, accounting for about 5% to 6%.
At the meeting, the scientific and safety application of plant growth regulators became the focus of discussion. Zheng Xianfu, a professor at the College of Science, Henan Agricultural University, said that the effects of plant growth are affected by many factors, such as crop variety, growth cycle, application site, regulator variety, application concentration, application method and external natural conditions. For this reason, there is a high demand for the use of plant growth regulators. Once an error occurs, it may cause phytotoxicity to crops, which in turn causes unnecessary losses. In recent years, phytotoxicity has become the most prominent problem in the use of plant growth regulators. For example, the period of use, the dose used, and the incorrect method of use can lead to phytotoxicity, and the use of regulators at random may also cause problems. He said that the same plant growth regulators use different doses for different crop varieties. Even most people think that a very broad-spectrum and safe plant growth regulator, the amine fresh ester, has been plagued on Dalian nectarine. Therefore, companies are obliged to do a good job in propaganda and popular science.
Duan Liu, a professor at the Crop Chemistry Control Research Center of China Agricultural University, said that because of the strong pertinence of plant regulators, the effect of increasing production, increasing income and improving quality is obvious when the application amount is small and the dosage is accurate. The plant growth regulator is preferably a crop corresponding to one preparation, because even the same crop (or different varieties) have different sensitivity to plant growth regulators, and time effects, concentration effects, position effects, and regulators may occur. Interaction and cooperation can have different effects. For example, 2,4-D has the effect of preventing falling flowers and fruit at 20mg/kg, and inhibiting growth and germination when it is 100~500mg/kg. Factors affecting the effect of the regulator are in addition to the regulator product itself, as well as adjuvants for the modulator, as well as the medication technique (treatment period, location, treatment method, treatment dose concentration, number of times) and external environmental factors. The problem of regulators that have occurred continuously in recent years is all related to improper use.
Yan Yaqi, general manager of Sichuan Guoguang Agrochemical Co., Ltd., said that it is best to understand the physiological characteristics of plant growth regulators and plants, because the physiological effects of plant growth regulators are often related to the growth and development of plants, and different growth periods may be used. Physiological effects. Therefore, it cannot be used in accordance with the uniform standard. A product should be tested in the first place, and then the appropriate usage and dosage should be found before expanding the application.
Qin Dongmei, a researcher at the Residue Review Office of the Pesticide Testing Institute of the Ministry of Agriculture, said that the national food safety standard “Maximum Residue Limits of Pesticide in Food†jointly issued by the Ministry of Agriculture and the Ministry of Health has been implemented since March 1 this year. As the only compulsory national standard for regulating pesticide residues in food in China, the new standard has established 2293 residue limits for 322 pesticides in ten categories of agricultural products and food. Among them, the maximum residue limit of pesticides on various crops such as rice, wheat and melon was added to seven kinds of regulators such as paclobutrazol and ethephon. In addition, "residual limit standards for regulators such as uniconazole and mepazine in various crops will be released soon, and the Ministry of Agriculture will further supplement and improve." Qin Dongmei said.
At present, the plant growth regulator industry still has problems such as decentralized research and development, weak independent innovation capability, low industry concentration, and serious product homogeneity. Many participants said that the plant growth regulator industry should strengthen technological innovation. Enterprises and scientific research units should jointly organize and jointly build independent innovation platforms, gather strengths, jointly tackle key problems, form industrial science and technology innovation alliances, and play a leading role in mainstream production enterprises. The government's support role and the service role of industry associations jointly promote the healthy development of the plant growth regulator industry.
Farmers Daily
Magnesium Chloride is the name for the chemical compound with the formula MgCl2 and its various hydrates
MgCl2(H2O)x. These salts are typical ionic halides, being highly soluble in water. The hydrated magnesium
chloride can be extracted from brine or sea water. Our magnesium chloride products are made from solar
evaporation of seawater.
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Classification: |
Chloride |
Name |
Magnesium Chloride hexahydrate |
CAS No.: |
7791-18-6 |
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Grade Standard |
Industrial grade |
MF |
MgCl2(H2O)x |
Place of Origin |
Shandong China |
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Appearance |
Flakes,pellets,powder, granular |
Purity: |
46% |
Brand name |
Xinchang |
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Packing |
20kg,25kg, or 1000kg bag |
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Applications:
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