Propagation method of safety tree The propagation of safety tree adopts sowing and seedling raising. In southern China, ripe purple-black fruits can be sown in September-June, 65438+1October. After washing the peel and pulp, the seeds can float in a cool place to dry. If you can't sow immediately because of bad weather or the nursery is not ready, you should store the seeds in wet sand and keep them in a cool place, and pay attention to prevent the seeds from becoming moldy. After the seeds are exposed, they can be planted in the ground or bagged.
Before sowing, the ungerminated seeds in the sand can be soaked in 0.3% formalin solution for 30 minutes, then the excess liquid medicine is poured out, sealed for 2 hours, washed with clear water to remove the liquid medicine attached to the seed epidermis, and then soaked in clear water for 24 hours, which can improve the germination rate. If the seeds are not disinfected, they can be directly soaked in warm water at about 40℃, which can also improve the germination rate.
Usually, ditching is the main method, the row spacing is 20 cm to 25 cm, the spacing between plants is 5 cm to 7 cm, and the covering thickness is 1.5 cm to 2 cm, which can germinate in 20 to 30 days. Keep the seedbed moist. After the seeds are unearthed in 1/ 3, remove the grass for two or three times, and then set up a shed for shade. When the seedlings grow 3 ~ 4 true leaves, liquid fertilizer can be applied once a month, and it should be stopped after autumn, so as to do a good job of cold protection and overwinter at a greenhouse temperature of not less than 5℃. Because of its few fibrous roots, it should be transplanted as soon as possible, or germinated in sand bed, planted in bags, and produced commercial seedlings in bags or bags in southern China, with better results.
Cutting method for selecting branches of Ping 'an tree: select semi-lignified branches that are relatively strong in that year. At this time, the branches are in the period of transformation to mature branches, with strong cell meristematic ability, easy to produce healing tissue and high survival rate.
Cutting substrate: perlite and vermiculite can be mixed according to the ratio of 1: 1, and then disinfected with 500 times carbendazim solution, which can be used the next day.
The specific operation method of cutting the safety tree is as follows:
1. Cut the branches of Pingan tree into 10cm ~ 15cm long, leaving 2 ~ 3 leaves to reduce water loss. Leave 3 cm to 5 cm at the lower end of the cuttings, cut into oblique angles, and wait for the cuttings in a damp place.
2. Insert the branches of Pingan tree into the soil for 2/3 (dip them in rooting agent or powder if possible, and skip them if possible), then compact them, put them in the shade, cover the whole cuttings with plastic bags, keep the humidity at 65,438+000%, and put them in the shade to avoid direct sunlight. When rooting, the soil need not be too wet, and when the humidity of the substrate is high, do not water it. If the cuttings are watered less, they will die of drought, and if they are watered more, the wound tissue will rot.
Remove the plastic bag in about 3.20 days. After removing the plastic, the exposure time to weak sunlight can be increased in the morning and evening, and roots can take root after 25 days, and new roots with a length of 1 cm to 2 cm can grow in about one month. Roots are 5 cm to 6 cm long and can grow in 2 months. Old leaves don't fall off, but new roots are produced, which shows that the cutting seedlings survive.
Precautions for planting safe trees get wet in the rain
Proper rain can promote safe trees planted outdoors. However, it is necessary to check whether there is water in the basin soil in time, drain it in time and loosen the soil.
prevent disease
Trees have dense branches and leaves, and in the growing period, the leaves are easy to turn yellow and dry. Spray chemicals in time to avoid serious illness. In addition, it should be noted that yellow leaves may also have rotten roots. When there is no change in spraying, check the roots in time and deal with them accordingly.