How much do you know about plant growth regulators?

98% of plant growth regulators are low or slightly toxic. On July 4, at the national plant growth regulator development and application exchange meeting held in Qingdao, Zhang Wenjun, director of the laboratory of the pesticide testing institute of the Ministry of Agriculture, put forward his own views on the current prejudice against the existence of plant growth regulators.

At present, farmers have various problems in the process of using regulators, such as inadvertent period, inappropriate dose concentration, unreasonable mixing, etc. Some farmers even use fertilizers instead of fertilizers, resulting in insufficient nutrients, premature senescence, affecting yield and quality. Even residuals. Ye Jiming, deputy director of the Ministry of Agriculture's Pesticide Testing Institute, said that the regulator itself has irreplaceable advantages: first, it is highly targeted and has a promoting or inhibiting effect on crops; secondly, it is widely used, and is widely used in food, cotton and fruit trees. , various vegetables and other crops; third, the amount of use is small, most of the season only need to spray once every specified time.

The biggest advantage of plant growth regulators is the safety. As of June this year, among the 482 plant growth regulator preparations registered by the Ministry of Agriculture, environmentally friendly dosage forms (including water, soluble powder, and wettable powder) accounted for 2/3, and low-toxic or slightly toxic preparations accounted for more. 98%, plant growth regulators are much less toxic than other pesticides such as pesticides and herbicides.

Some manufacturers have strict technical requirements, resulting in uneven growth of plant growth regulator products. Yan Changxu, chairman of Sichuan Guoguang Agrochemical Co., Ltd. said that many manufacturers add ingredients at will, and the technical guidance for farmers is not in place. "Some regulators generally only need to spray one season crop according to the specified time, but some manufacturers want to promote products. Tell the farmers to use it like a foliar fertilizer for three or five days, causing product abuse and even residue."

At the same time, domestic plant growth regulators are also facing the problem of aging varieties. Tan Weiming, an associate professor of agronomy at China Agricultural University, pointed out that the 35 registered varieties with the highest sales volume were all developed before the 1990s, accounting for 65% of the total number of regulator products, and there are many generic products and few self-created products. R & D is relatively weak, poor intellectual property protection, and the cost of counterfeiting is too low, which restricts the development of plant growth regulators in China."

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