Application of a concentration of plant growth regulators has a dual effect of promoting and inhibiting the growth and development of plants. Generally, it exhibits a beneficial effect in a certain low concentration range; while high concentration causes disturbance of metabolism, inhibits growth, and causes death in serious cases. Therefore, whether the application concentration is appropriate will directly affect the application effect of the regulator, and must be flexibly controlled according to the purpose of use. For example, paclobutrazol is used on early rice. Because of the low temperature, it can only be reflected in the growth and growth of the seedlings and the cold resistance of the seedlings. It cannot be reflected in the control length, and the application concentration should be low. The suitable concentration is 150 mg/kg. For use on late rice, there is also the role of dwarf plants and control of the length of the plant. The application concentration should be high, and the suitable concentration is 300 mg/kg.
The number of application times Usually, when the plant growth regulator is applied once in a critical period, there will be a significant effect, and multiple administrations are not only labor-intensive, but the effect is not necessarily better than one administration. However, when a plant growth retardant is used, multiple administrations at a low concentration are more effective than a single application at a high concentration. For example, in the cotton bud period, the use is ensured to be stable, and it is generally applied 3 to 4 times. Because multiple administrations at low concentrations not only maintain a continuous inhibitory effect, but also avoid toxic side effects on the plants.
The plant growth regulator is applied at an appropriate period of time to achieve the desired effect, and the appropriate period of application should be determined according to the purpose of use. To promote the early development of crops, it is advisable to use promoters at the seedling stage; to prevent crops from growing and to ensure stability, it is advisable to use inhibitors at the seedling stage; to promote fruit development, prevent premature senescence of small plants and promote early maturity, and appropriate growth regulators should be used. Applied at a later stage. The same growth regulator is used on different crops with different purposes and different application periods. For example, paclobutrazol is used to cultivate strong seedlings on rice, and tillering should be applied at the seedling stage; in soybeans, to prevent the plants from growing and reducing the number of fallen flowers, it is suitable to be applied at the initial flowering stage. The same growth regulator is used on the same crop for different purposes and different periods of application. For example, the use of ethephon in the production of melon, used to control the sex of the flower, increase the female flower, should be applied in the 2 leaf stage of the seedling; to promote fruit ripening, it should be applied 5 to 7 days before fruit harvesting.
Dazhong Author: Li Jingan
Petri Dishes (Stackable & Slippable)
Manufactured from medical-grade virgin polystyrene
Ventilation ribs reduce condensation and allow air circulation
Consistent flatness allows for even media distribution
Flared lid skirt and squared corners for easy one-hand operation, especially with gloves
Stackable Petri Dishes
Recommended for standard microbiology or general laboratory use
Stackable lid design for increased stability
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