NAA: English name 1- naphthylacetic acid, also known as a- naphthylacetic acid, NAA has low toxicity to people and animals. The acute oral LD50 of rats is 1000-5900mg/kg, which can stimulate skin and mucosa. 70% sodium salt powder formulation. It is characterized by broad-spectrum plant growth regulator, which can promote cell division and expansion, induce adventitious roots to increase fruit setting, prevent fruit drop and change the proportion of male and female flowers. Seeds can enter the plant through the tender epidermis of leaves and branches and be transported to the whole plant with nutrient flow. The scope of application is suitable for cereal crops, increasing tillers, improving ear formation rate and 1000-grain weight; Cotton can reduce the shedding of buds and bolls, increase the weight of peaches and improve the quality. Fruit trees promote flowering, prevent fruit drop, accelerate maturity and increase yield. Melons and fruits prevent flowers from falling and form small seeds and fruits; Promote cuttings to take root, etc. Naphthylacetic acid is often used in plant tissue culture, but tissue culture needs sterile environment, and the solution prepared by naphthylacetic acid needs to be sterilized. The sterilization method chosen is very important. Because naphthylacetic acid is a hormone, it will be inactivated by high-temperature steam sterilization, so it is generally sterilized by filtration.

Gibberellin: Gibberellin is a widespread plant hormone. Its chemical structure belongs to diterpenoid acid, which comes from tetracyclic skeleton. Can stimulate the growth of leaves and buds. There are at least 38 known gibberellins. The application of gibberellin in agricultural production has good results in some aspects. For example, increase the yield of seedless grapes and break the dormancy of potatoes; When brewing beer, GA3 was used to promote the germination of barley seeds to prepare maltose. When heading of late rice is slow due to rainy weather and low temperature, gibberellin treatment can promote heading; Or adjust the flowering period in hybrid rice seed production to make parents meet at this flowering period.

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