The growth process of plants should begin with the germination of seeds. The germination of any plant seed needs water, air and suitable temperature. However, the seeds of different plants have different requirements for these three conditions during germination.

2. Growth period of plant seedlings.

In the process of plant growth, after germination, the radicle first extends into the soil to form the main root, and then the hypocotyl elongates, pushing the cotyledons and embryos out of the soil surface. The cotyledons of this seedling were unearthed. The main shaft of seedlings under cotyledons extends from hypocotyl; The main axis between the cotyledon and the first true leaf is formed by the epicotyl. Cotyledons usually turn green after being unearthed, so they can temporarily carry out photosynthesis. Later, the germ developed into stems and real leaves on the ground. Nutrients in cotyledons will wither and fall off when they are exhausted.

3. The rapid growth period of plants.

In the process of plant growth, the growth rate of seedlings is the fastest and the growth amount is the largest. The growth of tree height is obviously accelerated, the area and number of leaves are rapid, and the diameter growth is accelerated. The position and root system grow the most in a year, which is the same law of most tree species, and this stage basically determines the quality of Ding seedlings.

During this period, the factors affecting the growth and development of seedlings are nutrients, water and temperature. The supply of nutrition is very important. Under the condition of sufficient nutrients, keeping up with water and suitable temperature, the seedlings grow fastest and best. In dry and hot summer, strengthening maintenance measures such as irrigation and fertilization can eliminate the adverse effects of excessive temperature on trees.

4. The hardening period of plant seedlings.

The growth process of plants can be said to be basically formed when seedlings are tempered, and the hardening period of seedlings begins from the sharp decline of seedling growth to the dormancy period of seedlings. Growth characteristics of seedlings in hardening stage: at this time, seedlings grow slowly and finally stop growing. The seedlings gradually become essential and form strong terminal buds, and the nutrients in the body enter the storage state. Early stage of hardening. Diameter and root system continue to grow, each with a growth peak.

Precautions.

1. Prevent soil erosion?

The soil in the planting area must be loose and fertile, and the drainage must be good. Generally speaking, it should be checked once or twice a year. After the rainstorm, carefully check whether there is scouring damage. In areas with serious soil erosion, measures should be taken immediately to plug the loopholes, otherwise the losses will continue to expand, causing a situation that is difficult to clean up. ?

Second, increase soil fertility?

During the growth of ground cover plants, fertility should be supplemented in time according to the needs of various plants, especially some flower-watching ground cover plants. The common fertilization method is spraying, which is simple, suitable for large-scale use, and can be carried out during the plant growth period, mainly by adding inorganic thin fertilizers such as ammonium sulfate, urea, calcium superphosphate and potassium chloride. Sometimes it can also be applied in early spring and late autumn or before and after the plant dormancy period, combined with soil covering, which is beneficial to the overwintering of plants and can make full use of organic fertilizer sources such as compost, cake fertilizer and river mud according to local conditions. ?

Third, drought-resistant watering.

Under normal circumstances, ground cover plants should choose drought-resistant varieties with strong adaptability, without watering. However, in the case of continuous drought and no rain, watering should be carried out to prevent ground cover plants from being seriously affected by drought. ?

Fourth, pest control Most ground cover plant varieties have strong resistance to pests and diseases, but sometimes pests and diseases will occur due to poor drainage or improper fertilization. Sheath blight is most likely to occur when plants are planted in a large area, which can wither a piece of land. Chemical spraying measures should be taken to prevent its spread and expansion. Followed by botrytis cinerea and sooty blotch, attention should also be paid to prevention and control. ?

Pests are most likely to occur, such as aphids and bridge builders. , and should be sprayed after the occurrence of pests. Because of the large planting area of ground cover plants, prevention should be the main prevention method.