cultivation techniques
Choose a place
Nursery sites should be selected in leeward areas with flat terrain, slopes not exceeding 5 °, convenient transportation, sufficient sunlight, deep and fertile soil layers, loose soil, and convenient drainage and irrigation. The soil should be weakly acidic sandy loam or loam. Newly opened seedling cultivation sites should be planted with fertile humus soil from forest land or mycorrhizal soil from old gardens at a rate of 150-225 t/m ² The area of container seedling cultivation land can be determined according to the number of container bags. Generally, the bed is 10 meters long and 1.2 meters wide. Excluding trails, ditches, etc., it can accommodate 1.2-1.5 million bags per square meter.
Soil allocation
The preparation of nutrient soil is the key to the success of container seedling cultivation. In production practice, the following proportions are used: 30% burnt soil, 30% yellow heart soil, 30% forest topsoil, 10% mycorrhizal soil, and an additional 3% superphosphate; Or burn 40% soil, 30% yellow heart soil, 30% mycorrhizal soil, and add 3% superphosphate. Mix the prepared nutrient soil evenly and spray it with 40% formalin solution at 100 times dilution onto the mixed soil for disinfection.
bagging
The best sowing time is generally in late March, and afforestation can be carried out in the winter or spring of the following year, or during the rainy season of the same year. Starting from one end of the bed, pack the prepared nutrient soil into bags. Each bag should not be too full, leaving a gap of 1.5-2.0 centimeters on the top. After packing, neatly place them back into the bed in sequence. The containers filled with nutrient soil should be arranged neatly in rows and in the same quantity, with the top level or slightly higher than the ground by 12 centimeters and not lower than the ground. Bagging work and seedling cultivation should be carried out simultaneously. The sterilized seeds are directly sown into bags, 2-3 seeds are sown in each bag, covered with fine soil, watered thoroughly, and after germination, the surplus seedlings in some containers with more seedlings are moved to the containers with less seedlings, and after transplantation, the root setting water is sprayed with a spray.
nurture
The torch pine should be nurtured twice or more in the year of planting, and the first soil loosening and weeding should be carried out from March to May; The second time should be conducted from August to October. Fertilization should be applied once, mainly using farmyard manure or nitrogen fertilizer mixed with some phosphorus and potassium fertilizers, with a nitrogen phosphorus potassium ratio of 2:1:2. Nurture 1-2 times a year in the second and third years, and continue nurturing once again in the fourth year if it is not yet closed. The area of plant nurturing should be expanded year by year. Weeding and soil loosening should not damage plants and roots, and the depth of soil loosening should be shallow, not exceeding 10 centimeters. Pruning: Starting from the 6th year of life, pruning should be carried out with a height of about 2 meters below the branch, adjusting the ratio of stem to crown to 3:2. Pruning should be done in late autumn or early spring. Prune every 2-3 years in the future.