Cutting Seedling raising technique of Eucalyptus

The application of eucalyptus cutting seedling technology in eucalyptus seedling cultivation is a successful model, because eucalyptus is a kind of tree species that is difficult to root, through the use of juvenile treatment, growth hormone stimulation, to create a favorable rooting environment, to achieve a higher rooting rate, which can also be used as a reference for the mass reproduction of other valuable tree species. Let's take a look at eucalyptus cutting seedling technology.

Mother Tree Management of Eucalyptus

1. Reasonable sparse planting: the mother tree should choose flat land with good ventilation, sufficient sunshine and moderate water and fertilizer conditions, and the bed should be raised before planting without stagnant water. The width of the bed is 1 to 1.2 meters and the trail is 40 centimeters. 5-6 trees are planted in each row, and the row spacing is about 25 centimeters. Not less than 20 cm, otherwise the plants will become slender due to mutual crowding and insufficient light, resulting in a decline in the quality of branches.

2. Dwarfing treatment: according to the young principle of low sprouting, the mother plant can be dwarfed as far as possible, and the tissue culture seedlings can be planted when they grow to 10 cm, and when they grow to 15 cm, they can be trimmed. When pruning, it is appropriate to leave 2-3 pairs of old leaves, and the young parts can be cut. After that, a pair of old leaves are left for the next sprouting, and the top dominant plants should be cut off in time to promote their sprouting lateral branches.

3, fertilizer and water management: eucalyptus mother trees do not need much fertilizer, generally use slow-acting soil fertilizer and a little compound fertilizer to avoid excessive application of nitrogen fertilizer and human feces and urine, otherwise cause sprouts to grow too long, too young and lead to cutting failure do not need too much water, generally maintain a semi-dry and semi-wet state, do not accumulate water.

4. pest control: eucalyptus mother trees generally have few diseases because they are planted on the ground and sparsely planted, usually mainly for prevention. In rainy seasons, broad-spectrum fungicides such as carbendazim can be used to prevent diseases and pests, such as eucalyptus small roll moth, aphids, termites and large crickets. Eucalyptus small leaf roll moth and aphids can be sprayed with trichlorfon, and termites crickets can be killed with methamidophos.

Cutting techniques of Eucalyptus

1, cuttings cutting: eucalyptus mother tree to sprout to 10-15 cm, there are two pairs of old leaves, ear strips require semi-Lignification, with terminal buds, disease-free leaf pruning will generally cut off the long leaves.

2. Bag mud treatment: the substrate for cutting does not need fertility, and pure yellow soil is generally used, which requires loose soil and does not contain impurities such as grass root garbage, and is bagged for use after crushing. The bag specification is generally 813 honeycomb seedling bag or 813 non-woven seedling bag before cutting, then disinfect the bag mud with 0.3% potassium permanganate solution.

3. Cutting method: before cutting, the cuttings were disinfected with 0.2% topiramate aqueous solution for a few minutes, then the base was dipped in rooting powder and inserted vertically into the center of the bag with a depth of 2cm, drenched with water and covered with a shading net (not used if there was a greenhouse). The main component of rooting powder is indolebutyric acid, the concentration is 800 × 10-6 × 1000 × 10-6, and talc powder is used as filler.

Post-planting Management of Eucalyptus

1. Timely watering: the main function of watering is to keep the cuttings fresh and the number of times of watering depends on the weather, generally 2-3 times a day in sunny days, and more in the first planting once a day in cloudy days, and then decreases gradually.

2. Shading treatment: the purpose of shading is to reduce the temperature to prevent drought and maintain humidity, at the same time, it can promote the formation of plant growth hormone and photosynthesis, the temperature is low in overcast and rainy days in spring, the light can be appropriately increased (60-70%), the high temperature and sunny days in summer and autumn are more, and the environmental conditions for cutting and rooting should be adjusted timely according to the above principles. In order to effectively improve the rooting survival rate of cuttings.

3, refining seedling management: eucalyptus cuttings after a period of time (usually 15 days in summer, about 30 days in winter), then grow roots and survive, at this time can accept full-light seedlings, at the same time remove diseased and dead plants, and seedling classification due to changes in the environment, at this time to increase watering, beware of leaves turning red, mature leaves thick green, seedlings stout and Lignification, developed roots, you can come out of the nursery.

4. Disease and pest control: after eucalyptus cuttings, the main cause of cuttings rot is the infection of rot bacteria caused by high temperature and humidity. The most common diseases of eucalyptus cuttings are Botrytis cinerea and stem rot. Available agents are methyl thiophanate carbendazim chlorothalonil Bordeaux solution and so on. It is best to rotate to avoid drug resistance.