Seedling raising techniques of Robinia pseudoacacia

Robinia pseudoacacia, also known as Robinia pseudoacacia, is relatively drought-tolerant and can grow normally on arid sunny slopes and sandy land in North and Northwest China. It is a good tree species for timber, soil and water conservation, wind prevention and sand fixation and "four sides" greening in North and Northwest China. This paper introduces the seedling technology of Robinia pseudoacacia: Robinia pseudoacacia generally uses multi-purpose seeds to raise seedlings. First, seed treatment. There are different numbers of hard seeds in Robinia pseudoacacia seeds, which should be treated by gradually warming and soaking seeds many times, that is, soaking the seeds in 60 ℃ water at first, cooling naturally, and then taking out the swollen seeds after 24 hours; for the unswollen seeds, soaking the seeds in 80 ℃ water, then cooling, covering the swollen seeds with wet sacks or straw mats, stuffing and accelerating germination, and then sowing after 1.5-2 days. Second, sow seeds. The sowing time is from late March to early April. The application of organic fertilizer per mu, such as circle fertilizer 3000-5000 kg, strip sowing, row spacing 40 cm, covering soil 1-1.5cm, sowing rate about 4 kg per mu. Third, nurture and management of seedlings. It is appropriate to plant seedlings in the morning and set them late. Generally divided into 2-3 times between seedlings, when the seedling height of 15 cm, plant spacing of 10-12 cm, about 10,000 plants per mu. The root system should be well ventilated and should not be watered more. It should be based on the principle of no drought and no watering. A small amount of phosphate fertilizer can be applied in the fast-growing period. Fourth, pest control. The main diseases and insect pests of Robinia pseudoacacia are root maggots and blight. When root maggots occur, the activity of trichlorfon can be inhibited by watering it in shallow trenches near the seedling ridges. In order to prevent the occurrence of blight, irrigation should be controlled and soil loosening should be strengthened. Under the condition of normal growth, one-year-old seedlings with an average ground diameter of 1.2 cm can be out of the nursery for afforestation.