Regulators used for rooting include naphthylacetic acid (sodium), indoleacetic acid, indolebutyric acid (sodium or potassium), naphthoxyacetic acid and phenolic compounds. Among them, indoleacetic acid mainly promotes the generation of adventitious roots; Sodium naphthylacetate can increase the number of straight roots when it is used for seed soaking, root soaking and cutting. Indobutyric acid (IBA) is similar to endogenous auxin, and its biological activity lasts for a long time. It is mainly used to promote the rooting of plant cuttings and the early rooting and multiple roots of transplanted plants.
2. Proportion and usage of rooting powder (agent)
0 1, rapid impregnation method
Soak the cuttings in the solution with rooting powder content of 500-2000 ㎎/㎏ for 30S before cutting. Because the cutting liquid treated by this method only adheres to the surface of its soaking part, it gradually disappears with the leaching of water after cutting, so it is difficult to ensure the need for rooting substances during the formation of adventitious roots of cutting. In cutting seedling, this method is only used for single bud cutting or repeated treatment. The general processing content is 500-2000 ㎎/㎏, and the processing time is 30S.
02, soaking method
Prepare the rooting powder into a low-content solution (50-200 ㎎/㎏), and then soak the lower part of the cuttings in the solution for 2- 12h.
This treatment is particularly important for dormant branches, because it is beneficial to the elution of inhibitory substances in dormant branches, which is not affected by external environmental conditions, and can ensure that all the liquid absorbed by cuttings is used for the formation of adventitious roots.
When processing, according to the specifications and maturity of branches, generally speaking:
A. Big branch: soak the whole branch for 4-6 hours with 50㎎/㎏ or 100㎎/㎏ liquid medicine, only the part with latent adventitious root primordium is soaked.
B 1 annual dormant branch: soak the whole branch in 50㎎/㎏ or 100㎎/㎏ medicinal liquid for 2 hours.
C. shoot: according to lignification procedure and cutting size, it can be soaked for 1-2h, and the soaking depth is 2-4 ㎝.
03, powder treatment method
Before cutting, apply rooting powder on the base of cuttings, and then cut.
When processing, the base of the cutting is soaked in water and inserted into the powder, so that the powder can be fully attached to the cut of the base of the cutting; Or the powder is emulsified with water and applied to the incision.
When cutting, be careful not to lose powder.
The advantage of this method is simplicity. The disadvantage is that the powder attached to the incision after cutting is easily dissolved in the cutting matrix with spraying or falling into water.
04, foliar spraying method
This method is often used for cutting or sowing seedlings.
When cutting seedlings, dilute ABT solution (10-40 ㎎/㎏) is sprayed on the leaves.
It has an excellent effect on tree species such as Pinus quinquefolius and Taxodium ascendens, which take root for a long time.
It is also in line with the polar transport law of rooting powder in plants that rooting powder is constantly supplemented on leaves.
Foliar spraying method is simple and easy, and is widely used in production.
Extended data
Matters needing attention in using rooting agent:
1. Strictly master the preparation method, concentration, administration times and administration site of drugs. Too much medication may cause drug harm, and too little medication often fails to achieve the expected effect; Rooting powder is a plant growth regulator, so it is recommended to use it 2~3 times with an interval of 10 day to give plants a time to absorb and utilize it. Medication site: It is best to water or soak the roots.
2. Grasping the application period mainly depends on the development stage of plants and the application purpose. Promote rooting when transplanting and stimulate rooting when cutting.
3. Rooting agent can't replace fertilization, and it must be combined with reasonable cultivation measures. When trees have just been transplanted or plants have just been cut, the roots of plants have not fully grown. At this time, the fertilized plants can't absorb it, and the utilization rate of fertilizer is low. Therefore, organic fertilizer can be applied appropriately.
4. When using the rooting agent of Happiness Forest to water seedlings, we should fully consider its growth habits, specifications, tree age, quarantine, temperature, humidity, light, soil properties, transplanting details and many other factors. Rational use of drugs combined with physical weather conditions and the growth characteristics of trees themselves. The rejuvenation of ancient trees also needs to combine the nutrient solution of happy forest trees to promote rooting and supplement the nutrients needed by trees.
5. The effect of rooting agent is only to promote roots, and the treatment of root injury can not rely on conventional rooting agent, which is often difficult to have an effect when the root system is seriously damaged. If the root system is seriously damaged or the product is sick, the diseased part can be cut off first, and the wound can be flattened, and then the wound can be sealed with Kuaihuolin Yuchuang ointment to avoid the spread of secondary diseases and pests caused by bacterial and fungal infections.
Reference source: Baidu Encyclopedia-Rooting Powder
References:
Application of China HowNet -ABT Rooting Powder
References:
Baidu Experience-How to Use Rooting Powder