What medicine is good for improving grape fruit setting rate?

What kind of medicine should be used to improve the fruit setting rate of grapes? What other methods can improve the fruit setting rate of grapes? Also ask netizens with grape planting experience to help introduce the better economic benefits of growing grapes. However, due to the influence of variety factors and bad factors such as temperature, humidity, light, moisture and so on, grapes often have bad fruit setting, resulting in serious flower drop and fruit drop, resulting in lower yield, lower quality and lower economic benefits. Therefore, in order to achieve high quality and high yield of grapes, effective measures should be taken in the management of flowering and fruiting period. the following planting network sorted out the methods to improve the fruit setting rate of grapes and enumerated them for netizens' reference. Method 1. During the period of rapid inflorescence extension before flowering, the first part of the inflorescence is pinched off by hand about a week before flowering, accounting for the length of inflorescence 1x5-1Universe 3. At the same time, the secondary inflorescence and the first and second branches of the inflorescence are removed, so that the inflorescence forms a short garden column, which is beneficial to increase the fruit setting rate, increase the fruit grain weight, make the ear a compact cone, and improve the appearance quality of the commodity. Method 2. Spray boron fertilizer, spray 0.2% Mel 0.3% boric acid or 0.2% borax solution once before flowering, spray once every 5 days for 3 times. Method 3. Spraying gibberellin and dipping 25-40ug/g gibberellin solution in inflorescence or spray at full flowering stage can increase the fruit setting rate and make the fruit mature 15 days earlier. Prevention of small grape fruit harm of iron deficiency in grape