Propagation technique of cutting Toona sinensis

The propagation of Toona sinensis cuttings can be divided into soft wood cuttings and hardwood cuttings.

The key of soft wood cuttage lies in the fullness of cutting tissue. The all-lignified branches are difficult or slow to take root; the branches are too young and are easy to rot after cutting. The survival rate of semi-lignified or mostly lignified branches as cuttings is high. Taking the budding branches on the root or stem as cuttings is easier to take root and survive than the branches on the crown. The specific method is as follows: from late June to early July, the branches on the trunk which are 20cm off the ground and have entered Lignification are cut into small segments of 20cm or 10~15cm, and the lower end is cut into an oblique orifice. The upper part of the cuttings retains two pairs of leaflets at the base of 1-2 compound leaves, and the rest of the leaves are cut off. The cuttings were dipped in 500mg/L 's NAA or vitamin D12 solution, inserted into loose, fertile and moist soil according to 40cm × 40cm density, and a small arch shed was built on the border to maintain 85%-90% relative humidity and 20-30 ℃ temperature, and rooting in about 50 days. The hardwood cuttage of Toona sinensis can not only make full use of the branch resources of Toona sinensis, but also maintain the excellent characters of the mother tree. it is a fast propagation, easy to grasp, scientific and practical technical method. One month after cutting, 40% of the cuttings produced healing tissue, 18% of the cuttings produced new roots, 30% of the cuttings began to sprout, and 2 months later, except for 4% of the cuttings withered, the rooting rate reached 94%, the germination rate reached 96%, and the average high growth reached 6.3cm. Hardwood cuttings after defoliation of Toona sinensis in early winter, select 1-2-year-old branches with a thickness of 1.0cm to 1.5cm, cut into 15~20cm segments, the upper mouth is cut flat, the cut distance from the top bud is cut flat, the lower end is obliquely cut, and the upper and lower incisions should be flat. Every 100 roots are bundled, aligned at the bottom, and buried in a wet sand pile for winter storage. Taken out in the next spring, the lower end of the cuttings was soaked in NAA500mg/L solution for 2 hours, washed and inserted into a sunny bed covered with pure sand in the bed, covered with plastic film, and a small arch shed was built on the border to maintain a temperature of about 25 ℃ and a relative humidity of more than 85%. After a series of management, it can be planted in the nursery in the same year or the following year.