Rapid breeding technique of Populus tomentosa

Pearl boxwood has bright green leaves and small and round leaves, which can be used as hedges and individual trees in landscaping. The technology of rapid propagation of softwood cuttings is introduced as follows.

1. Cutters should be located in greenhouses or greenhouses. After the ground is leveled and thoroughly disinfected, bricks are used to form a border-shaped slotting machine with a width of 100 cm and a length of 6 to 8 m (depending on the conditions) and a depth of 30 cm. Bed bottom cushion 12 to 15 cm thick cinder, gravel or coarse sand as seepage layer, 15 to 20 cm thick fine sand as cutting substrate. Before cutting, the seedling bed should be sprayed with water to make the water-holding capacity reach 40% saturation, and then the sand should be compacted and scraped flat for use. The first cuttage can be used directly, and 500 times potassium permanganate solution should be used for thorough sterilization.

2. Cuttings are prepared to select current year-old lignified branches with full tissue, strong development, no diseases and insect pests and sufficient nutrition as cuttings. Cutting and cutting should be carried out on a windless, dewy morning or on a cloudy day to prevent the sun from drying up the branches. After the branches are cut off, they are immediately immersed in water, and it is best to insert them as soon as they are cut.

3. The optimum time for cutting is from May to August, and it can also be carried out in April and September, but the rooting is slow.

4. cutting method on the cut branches, first remove the poorly developed branches in the lower part of the branches with scissors, and then cut them obliquely 0.5 cm away from the lower end bud, and the cut should be smooth. Proceed from top to bottom, cut each bud into a cuttage, and finally remove the tender shoots. If there are too many leaves, some of them can be subtracted to reduce water evaporation. Then soak in water and moisturize to be inserted. When cutting, first punch a hole with a stick equal to the thickness of the cuttings, with a depth of 2 centimeters, and then insert the cuttings to straighten and compact them. The row spacing of the plant is 4x6 cm.

5. After the insertion, the management immediately sprays through the water and shades the shade with a shade net to prevent direct sunlight and reduce water evaporation. The temperature in the shed should be kept at 25 ℃ to 30 ℃ and the relative humidity is about 80%. On a sunny day, spray water to the bed every 2 hours to keep it moist. If the bed is too wet, it should be ventilated and water controlled in time to avoid cuttings rotting. About 1 month later, it began to take root, at the same time, reduce shading, increase light and carry out a foliar topdressing. When the root grows to 2 cm, it can be transplanted.