The method of accelerating seed germination of Cornus officinalis

Cornus officinalis seed shell is hard, Lignification, and rich in a kind of gum, normally it is difficult to dissolve in water, the germ tender water, germination ability is relatively weak, so it is difficult to break the shell and germinate in a short time. In nature, Cornus officinalis seeds need to be retted for at least 12-15 months before they can germinate, and the germination rate is only less than 50%. Let's take a look at the methods of accelerating germination of Cornus officinalis seeds.

Traditional budding of Cornus officinalis

The main results are as follows: 1. Soaking in feces and urine to accelerate germination: the seed is directly put into human feces and urine after soaking in water storage, but this method is affected by temperature, climate, PH value of human feces and urine and other factors, the soaking time is not easy to grasp, although the cost is low, but the germination rate and success rate are also low.

2. Chemical soaking and sprouting: the treatment method of soaking seeds quickly with sulfuric acid, caustic soda or hormone, but because the concentration of acid and alkali is not easy to grasp, although the shell is corroded, it is easy to hurt the seed germ, so it is not used in production practice.

Seed treatment of Cornus officinalis

1. Seed selection: excellent seeds of Cornus officinalis, with full particles and uniform size, cut the cross section with scissors, the seed germ is blue-white, soft and fragrant, the immature seed germ is thin and weak, take off with needle or wire, the color is black and yellow, and is perishable.

2. Processing methods: the processing methods of Cornus officinalis commodities include boiling method, cage steaming method, raw kneading method, machine processing method and so on. Seeds used for raising seedlings must adopt raw kneading method or machine processing method, and the germination rate of raw seeds can generally reach more than 65%. On the other hand, the seeds boiled in boiling water only have a germination rate of 5-10%, even can not germinate at all or can not safely pass the summer.

3. Degreasing treatment: because the outer skin of the seeds of Cornus officinalis is hard and rich in colloid, the seeds must be soaked and degreased before sand storage treatment, the method is to pour the seeds into a corrosion-resistant container, and then weigh the white alkali in the proportion of 8%. The alkali is slowly poured into heated water to dissolve it, and then the alkali solution is poured into the container containing the seeds, and the alkali solution is suitable to extract the seed flour 3-5 cm. Stir with sticks 3-5 times a day. After 3 days, take out the seeds and pour out the leftover water, and then soak the seeds with the ratio of 3-5% alkali to seeds according to the above method, for 2 days, before and after 5 days, rinse the seeds with clean water, rub repeatedly or grind the shell with a ball mill to make the outer seed shell thinner obviously, then dry the seeds to 70% dry and set aside.

4. Sand storage treatment: because the germ of Cornus officinalis seed has post-maturity, it needs a period of natural dormancy after collection, so sand storage is very important. In order to break the excessively long dormancy period, there must be a suitable temperature for budding.

① chooses sunny, dry, well-drained land to dig pits, and the size of the treatment pits depends on the number of seeds. The pit should not be too deep, generally 20-30 cm is appropriate.

The bottom of ② pit is covered with 3 cm thick dung of cattle, sheep, mules and horses. Sprinkle 1-2 cm thick fine sand on the dung, and then spread the seeds evenly on the sand. The thickness of 2-4 cm should not be too thick, so as not to affect the quality of budding. Sprinkle a thin layer of sand on the seeds, spread 3 centimeters thick of cattle, sheep, mules and horse dung, and sprinkle a layer of sand on the dung. So layer by layer, generally 3-4 layers can be. Too thick to promote germination is not enough, affecting the rate of budding.

5. Greenhouse heating: temperature is one of the necessary conditions for seed germination. In the rapid treatment of dogwood seeds, the appropriate temperature can also break the long dormancy period of seeds and promote early germination. The general methods adopted are greenhouse heating method, fire channel heating method and plastic greenhouse heating method, among which the plastic greenhouse method has lower cost and is more convenient and common. According to the size of the treatment pit, the bow shed method is adopted to cover the film. Tighten up with Hadron to prevent the wind from blowing.

Daily management of budding

1. Moisture: because the seeds of Cornus officinalis have fully absorbed water in the process of soaking and degreasing, unless the sand is very dry, generally do not water the seeds to prevent the germ from rotting.

2. Ventilation: seeds are also life and need necessary breathing, so it is necessary to open a corner of the greenhouse once a month to benefit the wind. 8-12 hours at a time

3. Time: after seed treatment, the shed should be opened for inspection in 3-4 months. When 10-20% of the seeds are found to be broken in shell and the germ is in a state of germination and growth, they can be planted. In order to avoid excessive growth affecting the seedlings and wasting seeds.