Why Lagerstroemia indica seedlings don't germinate, and the correct seedling raising method.

The delay of Lagerstroemia indica seedlings may be affected by the planting environment, which has a

Why Lagerstroemia indica seedlings don't germinate, and the correct seedling raising method.

The delay of Lagerstroemia indica seedlings may be affected by the planting environment, which has a great relationship with sowing date, soil, water and nutrients. Lagerstroemia indica is semi-shady and likes to grow in fertile and humid soil. Sowing is usually carried out in February-May or August-65438+1October. The germination rate of Lagerstroemia indica seeds sown in these two periods is relatively high. If the seeds miss the suitable sowing date, they may enter the dormant period and germinate slowly.

1. Why do Lagerstroemia indica seedlings germinate slowly?

1. The germination of Lagerstroemia indica seedlings is mainly affected by the growth environment. Inappropriate sowing date, insufficient temperature and humidity, insufficient nutrients and water, and lack of oxygen in soil will all lead to low germination rate and slow germination rate.

2. Solution:

(1) Correct sowing date: generally in February-May or 8- 10, the germination rate is relatively high.

(2) Suitable temperature: Lagerstroemia speciosa stumps like to germinate and grow in a warm environment. If the temperature is too low, it is necessary to keep the Lagerstroemia speciosa stump warm and give it proper light. If the temperature is too high, it is necessary to cool and ventilate the Lagerstroemia speciosa stump.

(3) Water spraying and bagging for moisturizing: firstly, water is sprayed around the Lagerstroemia speciosa stump and branches, then the stump is wrapped with moss, and a bag is put on the Lagerstroemia speciosa stump for moisturizing. Lagerstroemia speciosa does not germinate, which may be due to insufficient water, so as to germinate.

(4) Raise the soil and loosen the soil: Overlying the soil too thick will lead to the lack of oxygen in the soil layer. It is necessary to loosen the soil to make it loose and breathable, so as to facilitate the root respiration, and cultivate the Lagerstroemia speciosa stump to expose its roots in time to avoid root injury.

(5) Supplementing nutrients in time: Proper application of some thin fertilizer to Lagerstroemia speciosa stump can promote the germination of new buds, but attention should be paid to the principle of applying thin fertilizer frequently instead of thick fertilizer.

Second, the correct method of raising seedlings

1. Seeding and seedling raising: mature capsules are picked in autumn, dried and cracked, seeds are taken out and stored in dry storage. Soak the seeds in warm water for 4 hours, then use wet sand to accelerate germination, and put the seeds in enough open space for bed sowing, drill sowing or sowing.

2. Cutting propagation:

(1) Hardwood cutting in spring: Before germination, select 1 robust branch as cutting, the cutting diameter is 0.5- 1cm, the cutting length is about 15 cm, the lower end is cut into horseshoe-shaped oblique mouth, and the upper end is cut into flat mouth.

(2) Cutting in summer: using semi-lignified branches as cuttings, cutting to about 15cm, removing the lower leaves, leaving 2-3 upper leaves, cutting in an open seedbed, and moisturizing and shading with plastic film and sunshade net.

3. Propagation by ramets: Dig out the sprouting strips around the mother tree, pay attention to keeping its fibrous roots, apply plant ash to the wound, and then plant directly.

4. Propagation by layering: When Lagerstroemia indica grows vigorously, select clustered plants, cut branches into the soil, and keep the pressed parts moist for rooting.