The recent cooling is obvious, the nursery should implement measures to prevent cold and prevent freezing, especially the new nursery stock park. To prevent the cold wave from harming the newly planted seedlings, the following aspects should be done.
The windward barrier seedbed is protected against the cold with windbreaks such as yam and straw. The wind barrier is usually 2 meters high and the distance is 10 to 15 times the height of the barrier. The night frost is removed after termination. Wind barriers are not only able to block the cold wind, but also increase snow cover, help soil conservation and prevent spring drought. For high-drying plants, weave grass ropes on the main trunk and large branches, and wind a strip-shaped film with a width of 10 to 20 cm clockwise from the bottom to the periphery of the grass rope.
Increase the coverage of seedlings can be covered with straw, wheat straw and other cold. A small number of precious tree species that are not cold-resistant can be covered with soil and cold, and the thickness is not suitable for plantlets. At night or in frosty snow days, shade nets can be placed over low shrubs to prevent direct contact between seedlings and leaves. For tall plants, three to four piles can be used around them, surrounded by shade nets, and then stitched with a string and covered with Yang nets at the top. On sunny days, the shade net was rolled up to allow the plants to receive light and raise the surface temperature.
Apply organic fertilizer to excavate 3 to 4 holes in the outer part of the canopy, with a depth of 50 to 100 cm, and apply fertilisers and manures such as manure and animal waste. It is advisable to apply fertilization to plant soil to cover the root and neck.
Pruning and cleaning Cut dead branches, weak branches, disease and insect branches, wind branches, etc., clean up litters under the forest, and centralize destruction. Tree trimming as required.
Pouring frozen water in winter when the soil around the seedlings is prone to frost damage, and the frozen water should be sealed before the soil is frozen.
The trunk is painted white and the trunks of the two or three years old growing in the nursery are painted white to enhance the antifreeze ability of the seedlings, and at the same time, the biting of the rabbits, rodents, etc. is prevented from harming the seedlings.
Heating sheds should be slightly taller than seedlings, lower in the south and higher in the north, and must be airtight on the ground in the north. They should be covered with straw curtains at night and be covered in cold weather all day long. The greenhouse can reduce the radiation heat radiation from the surface and seedlings at night, alleviate the sudden increase in temperature at sunrise, and block the cold wind.
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