Promoting fruit setting, expanding and increasing yield has always been one of the main applications of regulators. Since the research of plant regulators began in China, this kind of application has always accounted for a considerable proportion. From preventing tomatoes and eggplants from falling flowers, preventing apples from falling before harvesting, and promoting grape fruit expansion to applying inhibitors to promote fruit setting rate, we have successively applied inhibitors such as indoleacetic acid, 2,4-D, naphthylacetic acid, gibberellin and cytokinin. Promote fruit setting and fruit expansion, so as to achieve the purpose of increasing production and improving quality. However, when a certain pesticide is used alone, it will often increase the fruit setting rate, and at the same time, it will produce side effects such as empty fruit, cracked fruit and fruit stalk hardening, which can not meet the requirements of improving quality, so two or more plant growth regulators need to be mixed. However, the compound product must be scientifically tested, and the effective components and contents of the compound product must be strictly screened, otherwise haste makes waste, and even side effects may occur. The following are some commonly used compound preparations.
(1) sodium nitrophenolate+sodium α-naphthylacetate
Its preparation is usually aqueous solution or soluble powder, which consists of high-purity sodium α -naphthylacetate and sodium nitrophenolate. The commonly used aqua in the market is 2.85% (1.8: 1.05). These two components can cooperate with each other to broaden the efficacy and reduce the concentration, which not only activates sodium nitrophenolate, but also has the rooting effect of sodium α -naphthylacetate.
(2) Gibberellin (GA4+7)+ 6-BA
Its preparation is generally emulsifiable concentrate, soluble solution or smearing agent. Market products include 3.6%, 3.8% emulsifiable concentrate, 3.6% liquid preparation and 2.7% paste. It can be absorbed by stems, leaves and flowers of plants, and then spread to the active parts of meristem to promote fruit setting, pentagonal process of apples and increase weight. This mixture has been applied to Marshal Red Star, New Red Star, New Red Star, Red Fuji and Green Banana Apple. Generally, it is sprayed once in full bloom and once every 15-20 days for young fruits. In addition, it can also be applied to fruit trees such as kiwifruit, grapes and bananas.
(3) choline chloride+naphthylacetic acid (sodium)
Its preparation is generally soluble powder or aqueous solution. There are 25% aqua in the market, which are mainly used for tuber crops such as potatoes, sweet potatoes, radishes, onions and ginseng. This formula is an accelerator, which can improve photosynthetic efficiency, promote the transportation of organic matter, and transport photosynthetic products to root tuber as much as possible, thus increasing the yield of root tuber.
(4) Gibberellin (GA3)+ CPPU
Its preparation is generally emulsifiable concentrate or soluble solution. It is an upgraded product of 0. 1% chlorfenuron soluble solution. The function of gibberellin is to prevent the side effects such as hardening of ear axis and uneven size of young fruit. Generally, the concentration of gibberellin is 65438±00 ppm, and the concentration of clofenuron is adjusted according to the different crops to be treated, and the application range is 5-20ppm. If this mixture is applied to Kyoho grape, it is best to choose the concentration of gibberellin 10ppm+CPPU5ppm, which can not only improve the fruit setting rate, but also promote the expansion of young fruit and obviously increase the weight of single fruit.
(5) Gibberellin (GA3)+ (auxin)
Its preparation is generally soluble solution or soluble powder. Auxin-like substances, such as α-naphthylacetic acid, 2,4-d, p-chlorophenoxyacetic acid, β-naphthylacetic acid, etc. When applied to tomato, mango, pineapple, banana and other crops, it can improve the fruit setting rate and produce a certain number of hollow fruits. If it is used in combination with gibberellin, the proportion of hollow fruits will be greatly reduced and the quality will be obviously improved.
(6) gibberellin+auxin +6-BA
Its preparations are mostly ointments. The ratio is 0.3% gibberellin +0.005% indoleacetic acid +0.05%6-BA. When lanolin ointment was used to treat the young fruit stalks of Shui Xin pear, the single fruit weight could be increased by 28.6%, and the harvest time could be advanced by 7-8 days.
(7) Chlormequat chloride
Most of its preparations are aqueous. Its mechanism is mainly to improve the fruit setting rate by inhibiting the vigorous growth of new branches. If grapes are treated with 0. 1% choline chloride and 0.05% chlormequat chloride in the market, the fruit setting rate can be obviously improved when the new branches and leaves are about 6- 10. Its use concentration is related to the fertility of the field. Plants grow vigorously, the use concentration is high, the medium-long concentration is low, and the weak ones are not used as much as possible.
(8) Compound sodium nitrophenolate+paclobutrazol
Its preparations are mostly wettable powder or suspending agent. It is mainly used for controlling shoot and expanding of fruit trees. It is also a popular special plant growth regulator for fruit trees in recent years, and its application in fruit trees is in the ascendant.
(9) Thiophenone
Thibenuron is mainly used as cotton defoliant, but it is also a good cytokine at low concentration. According to some literature reports, its biological activity is higher than 6-BA in promoting fruit setting and keeping leaves green. Its preparation is wettable powder or soluble agent. The market products are 0. 1% thiabendazole soluble liquid and 0. 1% thiabendazole wettable powder, which are used in zucchini, melons, grapes and cucumbers. The concentration range is 2-4ppm, and it can be used by spraying or spraying, which can promote fruit setting, delay leaf senescence and induce callus differentiation and germination.
(10)DA-6+ retarder
Its preparation can be water, soluble powder, wettable powder, etc. Retarder is generally one or more of chlormequat chloride, mepiquat chloride, choline chloride, paclobutrazol or uniconazole, which is a fruit-setting promoter and can be used for tomatoes, grapes, fruit trees and tuber crops. The concentration range of DA-6 is 5- 15ppm, and the dosage of retarder varies greatly according to different types. The use period is generally controlled in the alternate period of vegetative growth and reproductive growth, so as to inhibit vegetative growth and promote reproductive growth, promote fruit setting and increase yield.
(1 1) Chlormequat chloride+p-chlorophenoxyacetic acid (sodium, potassium)
Its preparation is mostly aqueous solution or soluble powder, and its main application object is tomato. Spraying chlormequat chloride 150-200ppm+ p-chlorophenoxyacetic acid 25-25ppm on the whole tomato plant during the alternate period of nutrition and reproductive growth (about three days before flowering) can significantly improve the fruit setting rate and yield.