1 seed treatment and sowing? 1. 1 seed treatment?
(1) soaked Robinia pseudoacacia seed coat is thick and hard, and its water permeability is poor. In order to improve the germination rate, shorten the germination period and make the seedlings emerge orderly, seed treatment must be carried out before sowing. Pour hot water of about 55℃ into a container filled with seeds, stir while pouring until it is not hot, soak it overnight, and take out the swollen seeds with a sieve. The remaining unexpanded hard seeds were treated with water at about 85℃ for 65438 0 ~ 2 times until most seeds expanded. If there are hard seeds that are difficult to swell, you can wrap them in gauze and put them in boiling water 1s, lift them quickly, and then soak them in cold water for one night. ? (2) Accelerating germination In order to make seeds germinate evenly and emerge quickly, germination should be accelerated before sowing. Put the swollen seeds in a bamboo basket, cover them with a wet towel or a wet cloth, put them in a sunny or warm place, wash the seeds with clear water twice a day for about 5 days, and sow them when 1/3 seeds crack white. ?
1.2 sowing? (1) The sowing time is usually in March, when the temperature is low, which is beneficial to seed germination. ?
(2) Sowing method Before sowing, the container filled with nutrient soil is thoroughly watered with water to make the soil sink. Some containers have more nutrient soil. Make a hole with a stick and plant the germinated seeds in the containers, and plant 3 seeds in each container. Then spread fine cotton sand evenly on the container and cover it with soil, so that you can't see the seeds. ?
2 seedling management? Sowing depends on the weather. Generally, water is poured once every three days to ensure emergence. With the different growth stages of seedlings, the amount of watering is also different. One month after the seedlings are unearthed, they can be replanted. Generally, after replanting, the seedlings are thinned, and one plant is kept in each container. Weeding should be done in time so as not to affect the growth of seedlings. Spraying 1% ~ 2% ferrous sulfate solution every 1d after emergence to control damping-off and spraying 40% dimethoate? 0.05%? Use its solution to control aphids. ?
3 afforestation? (1) The best afforestation season is in early March, when the leaves have not germinated, and should be planted in light rain or cloudy days after rain. ? (2) The planting density of Robinia pseudoacacia is slightly higher than that of other broad-leaved trees, because Robinia pseudoacacia has many branches and curved trunk. Appropriate increase of initial planting density can promote the growth of tree height and cultivate excellent trunk shape. Plant spacing is generally 2 m× 1 m, every 667 m? 330 plants should be planted. ? (3) Soil preparation and burrowing Under unfavorable soil climate conditions in arid valley area, reasonable soil preparation method is an important technical measure to improve soil water, fertilizer, gas and heat conditions, make full use of precipitation, reduce soil moisture evaporation, improve seedling survival rate and preservation rate, and promote seedling growth. Generally, the soil preparation effect is better from the end of rainy season to March of the following year. During this period, the soil layer is wet, the temperature is not high, and it is easy to prepare soil. At the same time, after several months of sun baking, the physical and chemical properties of soil can be improved. Soil preparation can be divided into three methods: full reclamation, strip and block. According to the production practice, the local soil preparation adopts fish scale pit, which is generally 1 ~ 1.5 m long, 0.5 ~ 1 m wide and more than 30 cm deep. Dig a semicircle pit as high as Hengshan Mountain on the hillside. First, put the topsoil aside, and then cultivate the raw soil under it by cutting the outer cushion to form a semi-circular soil-rock stalk. After the mound is surrounded, the excavated topsoil is filled into the pit, and the pit surface is horizontal or slightly inclined inward. ? (4) When planting, carefully tear off the plastic film bag and put it straight. When planting soil, it should be pressed horizontally from all sides to prevent the container seedlings from being pressed vertically and the matrix in the container seedlings from being scattered. After watering, cover the mulch film, cut a gap of 7 ~ 10 cm in the middle of the mulch film, so that the seedlings can go straight into the hole through the gap. After planting, cover the mulch film with a layer of soil about 2 cm thick to prevent the mulch film from being blown away and scratched by the wind. In the process of planting seedlings with plastic film, the plastic film should form a pot bottom shape in the planting hole, which is convenient for water to flow into the soil near the roots of seedlings. ? 4 tending management? After planting Robinia pseudoacacia, it is necessary to strengthen the management of young forests. As the saying goes, "three points system, seven in charge". After planting, do a good job of hole expansion, soil cultivation, bud smearing and pruning in time, and do it 1 ~ 2 times a year. If the young forest is bent or not growing well, it can be leveled in early spring to regenerate sprouting strips, and then select the strong one from the sprouting strips to keep one.
This is all I found. If you want to be detailed, you have to buy books.
Topic: How to plant Robinia pseudoacacia
Author: Li Ting editor.
International standard book number:
Price: RMB 0.08.
Release location: Beijing
Publishing House: China Forestry Publishing House
Release date: 1956
Pages: 15 pages
Format: 18cm