It is also known as Cliff Papaya and is commonly referred to as Northern Camellia. Native to northern China, this oil-producing tree species is highly valued for its exceptional seed oil content, which ranges from 56.3% to 70%, surpassing that of soybeans. The oil it produces is of high quality, rich in nutrients, and considered an ideal edible oil. In addition to its oil, the fruit contains 26.7% protein, offering a well-rounded nutritional profile. Its fragrance is pleasant, and the oil extracted from the fruit has great potential for both culinary and commercial use.
The tree's wood is hard, dense, and resistant to decay, making it suitable for furniture, utensils, and even tea production. It also features beautiful white flowers with a delicate fragrance and a long blooming period, making it an excellent ornamental plant for gardens and landscapes. Moreover, the fruit shell has medicinal properties and can be used in the treatment of hypertension. The oil residue can be processed into organic fertilizers, adding value to the entire production cycle.
With deep roots and strong adaptability, the tree thrives in mountainous regions and plays a key role in soil and water conservation. Once planted, it begins to bear fruit within three years and can remain productive for over a century, making it a vital woody oil resource in northern China. Locals often refer to it as a "hard-boned" tree, emphasizing its resilience and longevity.
**Nursery Technology:**
1. **Seed Collection:** In mid-August, when the fruits begin to split, collect the seeds. Remove debris, dry them, and store them in a moisture-proof container.
2. **Germination:** In early April of the following year, soak the seeds in warm water (45°C) for seven days. Allow them to cool naturally, then place them in a basket covered with straw and keep them in a greenhouse at 20–25°C. Maintain humidity and gradually expose the seeds as they begin to germinate.
3. **Sowing:** Prepare a furrow 3–4 cm deep, spaced 15–20 cm apart. Sow the seeds on flat ground and cover with a mix of soil and fertilizer (1:2 ratio), about 2–3 cm thick. Gently level the soil after planting.
4. **Management:** After emergence, ensure proper irrigation or drainage to prevent rot. Avoid excessive dryness, which may hinder sprouting. Apply nitrogen fertilizer monthly from June to July, spray liquid compound fertilizer once a month, and sterilize the soil when necessary. Seedlings can be transplanted within the same year or cultivated for one to two years before being moved to the field.
5. **Grafting:** To improve yield and promote early fruiting, graft the tree using a scion collected in March. Store the scions in wet sand until late April, when the bark becomes loose. Use the cleft grafting method, placing the graft 10–20 cm above the ground. After about two weeks, buds will appear. Trim the rootstock slightly above the new shoot and secure the seedling if wind conditions are strong. Remove any competing shoots promptly.
**Planting Technology:**
The tree adapts well to various environments. When establishing a plantation, choose loose, fertile, well-drained sandy loam soil. Plant spacing should be around 2x2 meters, or adjust based on terrain—denser in hilly areas and more spread out in fertile plains. After planting in spring, ensure the roots are spread out and planted shallowly. Water thoroughly, and after the water is absorbed, cover the base with soil to protect the young tree. Apply nitrogen fertilizer before bud break, followed by phosphorus and potassium in June, and one final application in autumn. Watering should be done in conjunction with fertilization, avoiding overwatering to prevent root rot.
Single Couplet Lead Screen,X Ray Lead Shield For Hospitals,Single Layer Of Sheet Lead Screen,Single Couplet Radiation Protection Lead Screen
Longkou Kangxie Medical Instrument Co., Ltd , https://www.kangxiemedical.com