Leaf propagation of Populus tomentosa in Hokkaido

Propagation of Populus tomentosa with leaves can solve the problem of insufficient breeding materials. The specific methods are as follows:

1. The cutting time and leaf selection time should be in the middle and last ten days of April, and the temperature should be about 20 ℃. It can be carried out for years in the greenhouse. If you select the old leaves for more than one year, you can also use the leaves picked when cutting branches. The leaves should be picked by hand, pay attention to the heel, do not cut the leaves with scissors.

Second, the medium and bed medium had better use coarse river sand, peat soil and perlite can also be half, should be based on the principle of water storage and ventilation without stagnation. The medium should be disinfected, a small amount of it can be irrigated with boiled water and reused after cooling; for those with a large amount, methods such as sun exposure or drug disinfection can be used. The quantity is small, can use a little bigger flowerpot, wooden box and so on container to act as the inserting bed, the quantity is big can make the pool which is higher than the ground. The thickness of the medium layer is about 10 cm, but the lower layer should be covered with a permeable layer about 5 cm thick, and it is best to use slag.

Third, the cuttage will first soak the petiole of the cuttings with rooting agent (operate according to the instructions). Then use a 10 cm long, 2 to 3 cm wide, 0.5 cm thick plank, insert the medium 2 to 3 cm, make a flat hole. Insert the leaves treated with rooting agent into the hole, in addition to the petiole, but also insert the leaves into 1Accord 3. The inserted leaves should face in one direction for easy management. After insertion, the plug-in bed will be compacted and will not be watered for the time being, because the medium should be watered thoroughly before insertion. Wait for 8 to 12 hours before watering, watering does not need to be too much, as long as the medium and the blade stick without gap.

Fourth, after the maintenance of cuttings, cover the flowerpot with a plastic bag and open an air hole. If the quantity is large, cover the small arch shed on the inserting bed to ensure the proper temperature and humidity. Spray water on the leaves 4 to 5 times a day to maintain a relative humidity of about 80%. Because the petiole is short and small, the slotting machine must not lose water and drought. It usually takes about 30 to 50 days to take root. After taking root, remove the plastic cover and arch shed and let it gradually accept the sun. It takes a long time for branches to grow after rooting. Buds can be seen at the end of autumn under good conditions, and most of them can not grow branches until next summer and autumn.