Cultivation and afforestation of Populus simonii

Before seed collection, strong trees with straight trunk and excellent characters should be selected as seed collection mother trees and calibrated. When the fruits become Huang Shi, some fruits crack and begin to spit out white catkins, and they can be harvested. You can cut the ears or collect the fallen seeds. After collecting seeds, put them on indoor mats or small mud, spread them with a thickness of about 5cm, and turn them over 5-6 times a day. After 2-3 days, all the fruits are cracked, and the seeds can be threshed with bamboo poles. Airing until the water content of the seeds is 4%-5%, and sealing and storing at a dry low temperature. 1 kg of pure seeds can be obtained for every 30-50 kg of panicle, with about11-20,000 seeds per kg. The seeds of Populus simonii are easy to lose germination ability, so they are usually sown with harvest.

Seedling breeding

First, sow and raise seedlings.

Seeding and seedling raising of Populus simonii is more complicated than cutting, but sexual reproduction can improve vitality, resistance to pests and diseases, drought resistance and prolong life. Therefore, seeding and seedling raising of Populus simonii is more complicated than cutting, but sexual reproduction can improve the viability. The study of fine characters of Populus simonii has certain value in production practice.

1. Sowing: Before sowing, water is poured on the soles of feet. After the epidermis is slightly dry, the topsoil of 2-3cm on the bed surface (or ridge surface) is fully harrowed with a flat rake, then evenly sown, covered with fine sand for 2-3mm, and then crushed with a wooden shovel. Or after sowing, gently pull along the seedbed with a broom, then suppress it, and finally sprinkle water with a fine hole basin. Sow 0.50- 1 kg per mu.

2. Sowing in water: Before sowing, water should be poured, and when the water almost permeates, the seeds should be sown on the bed surface, and then the screened "three soils" (fine soil 1 serving, fine sand 1 serving, decomposed manure 1 serving, and a small amount of bacterial manure) should be covered to see the seeds.

Second, cutting seedlings

Cutting collection and processing: it can be collected in spring and autumn. Cutting should choose 1 year-old seedlings or healthy and vigorous branches of young and strong mother plants. The thickness is 0.80- 1.50cm and the ear length is 15-20cm. Cuttings collected in autumn should be stored in pits, kilns and sand piles for winter.

Spring cutting is carried out in early and middle March. Before cutting, cuttings can be soaked in clean water for 3 days or in running water for 5 days to promote rooting and germination. Water the seedlings in time after cutting. Irrigation 1-2 times before the seedlings take root. After that, irrigate every 10- 15d/time. Combined with irrigation and topdressing for 2-3 times in June-July, sprouting and pruning. Cutting in autumn is carried out after defoliation and before freezing. Directly insert, cover the soil 6- 10cm after insertion, and dig before germination in the next spring. At the same time, it is necessary to improve the soil through intertillage, increase the application of organic fertilizer and strengthen seedling management. The density of cutting seedlings is 20-30cm, 30-40cm, 7,000-9,000 plants per mu, 2 rows per ridge, 20cm per mu,15cm, 40-50cm, 12000-65438+. Selection of afforestation site Populus simonii is suitable for shallow mountains, hills, gullies, scattered flat land between mountains, gentle slopes of floodplain, river banks, wasteland and subsoil between hills.

afforestation method

Planting seedlings and cutting dry afforestation are the main methods, and planting strips can also be used for afforestation. Afforestation: afforestation with 1 year-old seedlings or 2-year-old seedlings, appropriate deep planting (hole depth of 40-60cm), root extension and actual stepping. Before planting or planting in water for afforestation in arid areas, the roots of seedlings should be soaked in running water for 5-7 days to promote the water absorption of seedlings and improve the survival rate. Cutting Afforestation: Short-stem Afforestation, select 1-2-year-old stout branches with the thickness of 2cm, cut them into branches of 40-50cm, deeply plant them in seedling holes, leave 3-5cm on the ground, and step on them. High-pole afforestation, choose strong branches of about 2m, with big head diameter of 4.50cm and deep planting of 50-80cm, which is practical. After planting, the seedlings should be watered. planting density

The afforestation density is generally 2m×3m, 2m×4m or 3mx5m. Mixing Populus simonii with seabuckthorn, Amorpha fruticosa, Caragana korshinskii and other shrubs is beneficial to the growth of Populus simonii, and its density depends on site conditions or mixed configuration.