Wei Zi Branch, can you get in alive?
Cutting seedling raising techniques of Lagerstroemia indica
1. The selection of Lagerstroemia indica is suitable for cutting in sandy soil with deep soil layer, loose soil and leeward, especially calcareous soil rich in humus. Disinfect the soil before cutting. The method is as follows: 5 days before mowing, 2-3% ferrous sulfate aqueous solution is sprinkled on the bed surface, with 5 kg of liquid medicine per square meter; It can also be diluted 400 times with 40% formalin solution 3 days before cutting, sprayed on the bed surface and covered with plastic film.
Second, cutting technology Lagerstroemia indica hard branch cutting should be from late March to early April. Softwood cuttings are mostly in the first half of June in summer, and they are inserted as soon as they are picked. Generally, cuttings are collected during the dormant period from autumn defoliation to spring sap flow, and annual branches that are robust, completely lignified and free from pests and diseases are selected in combination with tree pruning in winter. Hard cuttings in spring need to be stored in winter. The method is: cut the branches into about 15cm, and dig ditches in the shade with high terrain and good drainage, with the width of 1cm and the depth of 60-80cm. First, lay a layer of wet sand with a thickness of 5cm at the bottom of the ditch, and put the cuttings into a bundle of 50 branches in layers. When the main cuttings are placed 20cm above the ground, they are filled with wet sand, covered with soil to form a roof, and a straw is inserted in the middle to facilitate ventilation. In order to improve the survival rate of cuttings, cuttings should be soaked in running water 6-8 days before cutting. If it is stagnant water, it must be changed every day. When the lower incision appears obviously irregular tumor, it is cut. It can also be soaked in 1% sucrose solution for 24 hours, which can significantly improve the survival rate. Carefully prepare the soil before cutting and apply sufficient base fertilizer to make the soil loose and full of water. First, use tools to open a hole, insert cuttings along the hole, and then seal the hole tightly. The depth of cuttings is 2/3 of the length of cuttings, the plant spacing is 20cm, and the row spacing is 40cm. After the cuttings are inserted, pour water.
3. At the end of management cuttage, cover the seedbed with plastic film, seal the surrounding with soil, and use a sunshade net to shade the sun. If the temperature is too high and the humidity is too high, open both ends of the membrane to let the air circulate. It usually takes about three weeks to take root and sprout. After the cuttings take root, the mulch is removed step by step. After transplanting, the seedbed should be kept moist, and watered with small water and clear water at seedling stage to make it permeate the seedbed and avoid flooding. Irrigation 1 time every 3 ~ 5 days. Quick-acting fertilizer should be applied after 40 days of cutting, and the principle of fertilization by stages should be mastered. Weeding in the nursery begins in April and ends in September. Small seedlings should be shallow and big seedlings should be deep. Generally, the loosening depth is 2 to 4 cm, and then it is increased to 8 to 10 cm. During seedling hardening, loosening soil and weeding should be stopped. Lagerstroemia indica leaves are often infected with powdery mildew and sooty blotch. Before germination in spring, lime-sulfur mixture with Baume of 3-5 or 70% thiophanate-methyl wettable powder with 800- 1000 times and 25% triadimefon with 800 times can be sprayed.
4. Before the juice flows out in the spring of the next year, the seedlings should be transplanted tomorrow or in the sunny evening, that is, 2-3 days before transplanting, and the roots should be protected when raising seedlings. Seedling planting should be transported, watered and shaded.