The method of accelerating budding and raising seedlings of Robinia pseudoacacia

Robinia pseudoacacia is resistant to drought, barren and growing fast, so it is a good tree species for greening and afforestation in rural areas. If the root segment budding method is used to raise seedlings, not only the cost is low, the operation is simple, but also the seedling quality is good.

First, select the land to make the bed and choose the nursery land with leeward and sunny direction, flat terrain and good drainage and irrigation as the hotbed. Before making the border, 1000 kg of organic fertilizer, 50 kg of ammonium bicarbonate and 50 kg of calcium superphosphate were applied per mu. After ploughing and raking, 100 ∶ 1 wheat bran and methamidophos bait were sprinkled on the border surface to prevent mole cricket and other underground pests. Border surface north-south, 1.5 meters wide, 12 meters long, border ridge width of 50 cm, border surface and the ground level.

Second, root cutting discharge select excellent varieties such as Lu thorn 74068, annual seedling roots with a stem thickness of 0.2 cm to 0.5 cm, cut into 3 cm and 5 cm long root segments, and divide the root segments into three groups according to their thickness, and tie them into a bundle for each hundred roots, and store them in wet sand for storage, so as to prevent the root segments from losing their ability to germinate due to water loss; they can also be cut, graded, and arranged along with the roots. In the first ten days of March, the root segments were evenly arranged in the dug hotbed border, with 300,350 roots per square meter, which did not overlap each other. After sowing, enough water was sprayed and covered with 1cm thick soil, and then the arch shed was covered with plastic film, sealed around and dug drainage ditches.

Third, after the hotbed accelerates the germination and arranges the root to cover the film, the bed surface temperature is kept at 20: 25 ℃ to promote germination. It began to sprout in about 15 to 20 days, and all the seedlings appeared in about 30 days. The temperature in the border bed is low in the early stage, and it is not suitable to spray water in the border bed; after late March, the temperature rises gradually, and when the bed temperature exceeds 30 ℃ at noon, attention should be paid to proper ventilation and cooling to prevent sunburn seedlings. After the seedlings come out, you can spray water to moisturize, and choose to soak once in the sunny afternoon. Pay attention to ventilation and adjust the bed temperature and humidity to maintain the normal growth of seedlings. Drying and refining seedlings should be carried out when the seedling height is more than 5 centimeters, and the film should be uncovered two days before transplanting, so that the buds and seedlings can adapt to the field climate.

Fourth, the transplanting of bud seedlings requires that the ground is flat and convenient for drainage and irrigation. Before transplanting, 1000 kg of organic fertilizer, 50 kg of ammonium bicarbonate and 50 kg of calcium superphosphate are applied per mu. After comprehensive machine ploughing and raking, the ridge is made into a small north-south ridge with a width of 60 cm, a ridge width of 30 cm and a depth of 25 cm, and the ridge length is about 25 meters. The seedlings were transplanted when they were 5-10 cm high. Due to irregular germination of root segments, shoots should be transplanted in batches, and seedlings or ungerminated roots can continue to sprout in the hotbed. Transplant from the end of April to the first ten days of May. It is better to transplant in cloudy days; in sunny days, transplant should be done after 3pm to avoid the high temperature at noon, so as not to affect the survival of shoots and seedlings. When transplanting, first spray water in the border, and then use a small shovel to cut the soil into the basin; if the soil is scattered, the seedlings will be planted immediately. When planting, a small shovel is used to dig a small pit with a straight wall 5cm to 8cm deep, and the buds are implanted close to the straight wall, and then watered after covering the soil. Two rows are planted in each ridge, the row spacing is 45 cm, the plant spacing is 30 cm, and about 4900 plants are planted per mu.

5. seedling management watering once a day within a week after transplanting to ensure survival. After the seedlings survived in the middle of May, about 15 kilograms of urea per mu were topdressing with water, and in the middle of June, 15 kilograms of urea per mu were topdressing with water. Timely loosen the soil and weed and promote the growth of seedlings. Spray omethoate emulsion 100 times in time to prevent aphids from harming the seedlings in the green and living stage, and spray it again in the peak growth period. In this way, it can ensure that the height of the seedlings out of the nursery is more than 2.5 meters, and most of the seedlings can meet the needs of planting trees and afforestation on all sides.