Eucalyptus seed collection and seedling cultivation techniques

Koelrenteria paniculata, also known as the lantern tree, belongs to the genus Eucalyptus. In deciduous trees, the spring leaves are red, autumn leaves are bright yellow, and flowers are full of yellow trees. The membranous pericarp of the pods before and after the National Day swells like small lanterns, bright red, and hangs on the top of the branches like flowers. It has strong anti-dust and pollution abilities and is an ideal ornamental tree species for urban gardening.

Eucalyptus trees are mainly propagated by sowing methods, and they can be planted and rooted. The key technical aspects of seeding and reproduction are described below:

I. Seed-collecting: Seeds generally mature from September to October, and select excellent individuals as the mother tree for the seeding period. From late October to early November, we have good timing. When the spherical seeds turn brown, we must pick seeds immediately. Otherwise it will fall off on its own. The harvested fruit should be promptly sun-dried or spread dry. After the cracking of the capsule, beat and threshing. After drying, remove the membranous hull and other impurities to obtain the pure seeds and then remove the peel and fruit stems. Species. Net seeds are air-dried for 5 to 7 days and stored in bags or paper bags. In mid-December, the seeds are removed and mixed with wet sand that is more than 5 times the amount of seeds. They are stacked in the room and piled 25 to 30 cm high. The grass cover is overlaid, and it is often toppled. The moisture is added depending on the humidity to maintain the moisture content. About 15%.

Second, sowing: Eucalyptus generally use field seedlings. In spring March sowing, the soil sowing loose soil, good water retention and drainage performance, a certain fertility, no underground pests and germs. In the spring sowing, it is best to plant the land in autumn and winter till 1 to 3 times, in order to promote soil weathering, water storage, eliminate weeds and pests; soil preparation should be smooth, fine, and suitable for irrigation in drought-sparing areas before sowing. Bottom water. The basal fertilizer is applied to the selected land mass, and the furazolid granules or the zinc phosprophotic granules are used for killing insects in an amount of 8 to 10 kg per mu. After cultivating, make a flat bed with a bed width of 1.2 meters. The length depends on the convenience of management. Generally it does not exceed 20 meters. The germination rate of eucalyptus seeds is low, and the amount of seeds used should be large, generally 60-120 grams per square meter. The use of broad-spectrum seeding is not only beneficial to the ventilation of young seedlings, but also easy to manage. Each broadcast 5 lines. The depth of the ditch is 3 cm. The mixed sand in the seed does not have to be sieved out. The seeds and sand are evenly spread in the ditch. The soil is covered with 2 cm. The light step is used as a repression, and then the water is poured once with small water, covered with straw, and the seedlings are sprayed for about 25 days. Remove the straw. After most of the seedlings are unearthed, the coverings are removed in batches.

Third, seedlings

1. Shade: After the cover is removed, cover it in time. The shading time and shading degree shall be determined according to the local temperature and climatic conditions at that time to ensure that their seedlings are not affected by sunburn. Fall into the fall to gradually extend the lighting time and light intensity. Until the acceptance of all light, to increase the degree of lignification of seedlings.

2. Seedlings, make-up seedlings: Seedlings grow to a height of 5 ~ 10cm, 1 seedlings, 100 seedlings per 10 square meters is appropriate, the interplantlets require small stay large, to stay good, thin interstices, the whole seedlings Isometric and well carried out on rainy days. Combined with the seedlings, the seedlings were treated with seedlings to ensure uniform seedling distribution. We should pay attention to cultivating and weeding, timely dressing, and promote the vigorous growth of seedlings. After falling, the seedlings in the fall can be dug into the furrows and planted in the spring.

3. Transplantation; eucalyptus is a deep-rooted tree species, because the trunk is often not easy to straight, after planting can be used appropriate dense planting or flattening methods to straighten the seedling dry. Seedlings in the nursery generally have to be transplanted 3 to 4 times, sowing seedlings in the fall of the year after the fall can be dug into the trench to plant; The main root and the thick lateral roots should be properly cut at each transplant. This can promote multiple fibrous roots, making it easier to colonize later. The first transplant should be carried out with a smooth cut. The transplant should be properly planted, which will help cultivate a straight trunk, save the land, and strengthen the management of fertilizer and water. In the spring, buds are sprouted from the base, and those who choose to stay straight and strong are trained as trunks. The trunk grows fast and straight. If the first interception does not meet the requirements, the second spring may be processed again. After transplanting every 3 years or so, the main root and the thick lateral root should be cut properly during transplantation to promote new roots. One-year-old seedling height up to 80 ~ 100cm.

4. Seedling management: After the roots are unearthed from the seedlings, they should be fertilized in combination with watering. In the growing season, nitrogen-based fast-acting fertilizers should be applied to promote the vegetative growth of plants. In the autumn, nitrogen fertilizers should be stopped, and phosphorus and potassium fertilizers should be added to increase the degree of lignification of the plants and improve the cold resistance of the seedlings. In winter, Yishi Farm Organic Fertilizer is used as a base fertilizer to provide persistent nutrient for the growth of seedlings, and also play a role in keeping warm and improving the soil. To loosen soil, weed and water, and keep the bed moist, most of the seedlings after falling leaves at the end of autumn can be as high as 1.8-2 meters, and the ground diameter is roughly 2-2.5 cm. The seedlings were graded and graded, and transplanted in the spring of the following year. The roots were cut short before transplanting. The seedlings were cut off from the rhizomes after the transplantation. The seedlings were cut flat from the ground surface and then irrigated. After budding, the buds are often wiped, leaving only the strongest buds to develop into trunks. During the growing season, loose soil, sorghum, watering, and topdressing are often used. In the autumn, straight trunks can be developed. With the growth of seedlings, it is necessary to gradually increase the amount of fertilizer to meet the nutrient needs of seedling growth. When the height of the trunk reaches the height of the branch point, the main branch can be left to leave the garden for three to four years.

5. Pruning: The crown of the eucalyptus tree is nearly spherical, and its plastic requirements are also different due to different uses. Road tree seedlings are required to pass through the main trunk. The first branch height is 2.8 to 3.5 meters, the crown is full and the branches are uniformly distributed and developed. Ting Yinshu used seedlings to require large, dense crowns. The first branch height was lower than the street trees. In the cultivation process, appropriate pruning measures should be taken around the above requirements. It can usually be done in winter or at the time of transplantation. In addition, in the management of nursery, it is also necessary to timely do a good job of weeding the weeds, irrigation, drainage, etc., depending on weather conditions and soil conditions. Eucalyptus diseases and insect pests are few and, once they occur, they should be prevented and treated in time.