Promote grapes increased plant growth regulator in Chinese grape production has been used for half a century. In 1964 Xinjiang of China seedless grape have started using gibberellic acid to increase berry, and achieve success. In recent years, phenylurea class plant growth regulator such as Forchlorfenuron is also used as grape fruit expand agent. Whether these agents are safe for people, especially for sightseeing grape fruit security has attracted wide attention.
Plant growth regulators also known as plant exogenous hormones, is a chemical synthetic pesticide or biological pesticides getting from microbial fermentation production ways. And this corresponds to a class of plant inside naturally occurring plant endogenous hormones, namely plant hormones. Plant hormones contain only small amounts in plants, it is impossible to extract and utilize, so people develop artificial products as exogenous hormones used for agricultural production. Currently the "fruit swelling agent", "big fruit spirit", "big fruit treasure" and dozens of pesticides used in grapes production, their main ingredient are gibberellic acid and Forchlorfenuron of plant growth regulator.
United States since the fifties of last century has been put gibberellic acid for seedless grape fruit increased, is still the major "fruit swelling agent" of seedless grapes in all the countries in the world. Gibberellic acid is a biological preparation, is obtained through a specific microorganism cultured fermentation extract, is a living body's own metabolism natural product. Gibberellin as a plant cells growth hormone had been found more than 120 kinds in nature, gibberellic acid is the first application and the most widely used one. And later launched a gibberellin GA4 +7, as pear fruit's expand agent worked in Japan and China.
Gibberellic acid is generally use 1-2 times in grapes young fruit (0-18 days after flowering), the use of concentration was roughly between 25-100mg/L. Method used is primarily the dipping method, put the prepared potion into the plastic cup, immerse grape panicle for 1 second. Since gibberellic acid is not a chemical synthesis, and consistent with endogenous gibberellic acid structure in plants, is very safe to the human body, so widely used in Europe, America, Japan and China and so on. Human use microorganisms to produce cheaply gibberellic acid and widely used in agriculture, technology is mature, production is good, this is an important step forward of modern agricultural science and technology.
Forchlorfenuron is a phenylurea substance by synthetic chemical, is a plant regulator have similar effect with cytokinin, Japan registered for fruit crops in eighties, for grapes have extremely significant effects of increasing berries, promote bearing fruit, etc. Currently in melon, cucumber, gourd and other horticultural crops, a variety of fruit expand agents are inseparable Forchlorfenuron. In recent years, there is also a chemical Thidiazuron similar with Forchlorfenuron, China has passed the registration of pesticides permit using on grapes.
Forchlorfenuron compared with the gibberellic acid, its characteristic is the more significant effect of increasing berry, but the use of concentrations very low, usually between in 1 to 10mg/L (1 to 10 parts per million). The use time, methods in grapes are broadly consistent with gibberellic acid. Gibberellic acid is a biological agent, its safety to human is universally recognized. However Forchlorfenuron chemical synthesis plant swap, its security was always attach people's attention, especially the "watermelon explosion incident" caused a lot of misunderstanding. Japan in the early 1980s began trial Forchlorfenuron. Grape industry colleagues are familiar with Japanese grapes and other crops are still in the registration and using Forchlorfenuron (not as some "experts" said that Japan has stopped the registration and using).
Source:http://www.cospcn.com