Seedling cultivation techniques of Pinus sylvestris

(1) Soil preparation, soil improvement and seed treatment Before planting, detailed land preparation should be carried out, including tillage, hoeing, leveling, suppression, removal of grass roots and stones. The newly opened mountain seedlings should be thoroughly cleaned before the grass seeds mature. The nursery land should use a large amount of improved soil such as peat and river mud, and apply a sufficient amount of high-quality manure. Form a water conservation and fertilizer cultivation layer to create a good growth environment for seedling growth. The base fertilizer is good for decomposing pig manure. Before application, it must be finely sown, and the land for continuous seedling cultivation can be applied with 10,000 kg per mu. The transplanted land is applied with 2,000-3,000 kg. When applying grass charcoal and farmyard manure, be sure to mix well with the soil, and avoid the concentration of manure. Otherwise, the soil nutrient solution will be too thick, which will affect the normal growth of seedlings.

In order to prevent the occurrence of pests and diseases at the seedling stage, soil treatment can be carried out with ferrous sulfate, formalin, diclosan or other sterilizing and insecticides 7 to 10 days before sowing.

Pinus sylvestris var. mongolica seeds can be emerged without treatment before sowing, but in order to promote rapid germination after seeding, tidy emergence, and enhanced seedling resistance, germination treatment should be carried out before sowing, mixed with snow and germination, and the effect is good. 4 to 5 days before sowing, remove the seeds from the snow, place them in the sunny place or put them in the water. After the snow is cleaned, disinfect with 0.5% potassium permanganate for 2 hours, rinse with water several times, remove a little. Sowing in the shade can be done.

(2), sowing time should be based on local natural climatic conditions to determine the appropriate sowing date. Generally, it is more suitable when the average soil temperature at a depth of 5 cm below the surface reaches 8 to 9 °C.

(3), seedling method seedlings generally use a high bed, the bed surface is 10 to 15 cm above the walkway, and then covered with a layer of Straw. The advantage is moisturizing. The disadvantage is that the soil temperature is low, the emergence is slow, and it is necessary to manually watch the bird. In addition, it is necessary to spray water frequently to prevent the seed from drying. Garden seedlings can be used in low-bed seedlings. After sowing, do not cover the straw, cover the gauze net, and do not need to see the bird. Because it is a low bed, flood irrigation can be used to reduce the number of watering, save labor and reduce costs.

(4) The seeding rate and seedling density are determined according to the germination rate, germination potential, purity, and 1000-grain weight of the seed. The level of seedling technology and the soil condition of the depression should also be considered. If the indoor germination rate is 85-90%, the acreage is 6-8 kg, and the yield per mu can reach 220,000.

(5), the seeding method is spread. 3 to 5 days before sowing, fill the bottom water, when the bed surface is moist, the surface of the bed will be shallowed into a pockmark, artificial or machined, and timely suppressed, and then covered with fine sand, thickness 0.3 ~ 0.5cm.

(6) Management of the planting site 1) Covering grass: In order to maintain the moisture of the topsoil, adjust the temperature and humidity of the bed surface, prevent wind erosion or watering, wash off the soil when raining, cover the bed surface with straw after sowing, the thickness is It is not suitable for soil. Straw O, about 5kg per square meter of bed surface. When about 50% of the seeds have been unearthed, 1/2 is removed, and the seedlings are released, and all are removed.

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