How to harvest seeds? What are the breeding methods?

Davidia involucrata has become today's "living fossil" in the plant world, known as "Chinese pigeon tree," also known as "pigeon flower tree" and "water pear." Wild species only grow in Southwest Sichuan Province and Central Hubei Province and surrounding areas of China. It has been listed as a national first-class key protected wild plant. It is a unique single-genus plant in China and a relic plant. It is also a world-famous ornamental plant. It is a national first-class protected plant. How do you harvest seeds? What are the breeding methods? Let's take a look at it together with Xiaobian.

How do I harvest seeds?

10-11 Mature fruits of Davidia involucrata are collected in June, directly stacked on the cool and damp cement floor indoors, regularly turned to make the flesh gradually rot, and repeatedly kneaded with clean water to obtain clean seeds.

Before sowing in March in spring, seed soaking treatment can be taken. Pour the washed seeds directly into a bucket filled with diluted fresh human excrement. The human excrement must completely submerge the seeds, cover them, soak them for 6-8 weeks, stir them properly several times during the period, pour them into bamboo baskets after the fruit shells are cracked, and wash them with clean water.

2. What are the breeding methods of Davidia involucrata?

1. Sowing seedlings

The seeds of Davidia involucrata mature in October. The seeds are large and hard. The physiological post-ripening time is long. They have the habit of germination every other year. The germination cycle can last 2-3 years. Under natural conditions, most seeds rot before they germinate. Long germination time and low germination rate are common problems for artificial propagation of Davidia involucrata. The author has adopted sand stratification germination, human excrement seed soaking and other ways to carry out experiments, and achieved certain results.

2. Cutting seedlings

Hardwood cutting and softwood cutting can be used for Davidia involucrata, but the survival rate of hardwood cutting is low. But using semi-lignification branch to carry on the young branch cutting, the cell division is relatively vigorous, the vigor is strong, takes root easily.

3, layering propagation

Davidia involucrata can be propagated by aerial layering in spring. Select 1-year-old stout branches, peel them in a ring at the top of 10-20cm, wrap them with moldy soil and thin film, and root in about 4 months. This kind of method breeds seedling little, not often adopt, use for scientific research experiment more.

4. Seedling management

(1)shade

Whether it is seeding seedlings or cuttage seedlings, in order to prevent high temperature sunburn and drought, safe summer, should set up a shading rate of 70% of the net. After September, gradually extend the light time, increase the resistance of seedlings, improve the lignification degree of seedlings.

(2)Thinning and replenishing seedlings

When the seedlings of Davidia involucrata grow to about 5cm, they should be thinned out at a plant spacing of 10cm, supplemented with thinning seedlings, replanted in sparse places, and watered firmly. Ensure that seedlings are evenly distributed. Thinning seedlings follow the principle of "small and large, bad and excellent, dense and sparse, all seedlings equidistant".

(3)water and fertilizer management

Davidia involucrata seedlings are not resistant to water and humidity, and are easy to rot in poor drainage and ponding environment at the stage from budding to true leaf appearance, with high mortality. Therefore, it is necessary to strengthen the work of clearing ditches and draining water at ordinary times and properly control soil moisture. In summer drought should pay attention to proper watering, maintain moisture content. 6-8 Month, can be combined with drought topdressing, with urea 0.2%-0.3% aqueous solution for irrigation, and then wash seedlings with water, so as not to produce fertilizer damage. Spraying 0.2% potassium dihydrogen phosphate on the leaves of cuttings once every 15 days for 2-3 consecutive times can effectively promote the growth of Davidia involucrata seedlings.

(4)soil loosening and weeding

Loosening and weeding are carried out simultaneously. The weeds in seedbed can be directly eradicated by hoe for seeding seedlings, and weeds can be eliminated by small pointed shovel for cutting seedlings. Loose seedlings must be watered solidly. Weeds in the surrounding ditches, middle ditches and side ditches of the nursery can be eradicated with hoe or killed with glyphosate spray. Spray pesticide should control the spray range of the sprayer, and it is strictly prohibited to spray on the seedlings of Davidia involucrata. To prevent phytotoxicity. 5-9 Weeds should be removed at least once a month. To reduce the chance of weeds and Davidia involucrata seedlings competing for fertilizer, water and space, which is conducive to the healthy growth of seedlings.

The above is the introduction of Davidia involucrata. Davidia involucrata is transplanted from defoliation to germination in spring of the following year. The survival rate of transplanting with soil will be higher. Although seedlings can be cultivated by seed propagation, they germinate slowly due to seed dormancy and other reasons, which may take 2 years or even longer, and improper methods may be difficult to germinate.

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