Clean up snow and take insulation measures to prevent freezing damage
(1) Clear the snow (ice) on the tree and at the base of the tree: mobilize and direct the pear grower to shake off or clear the crown, branches, and snow on the tree. (2) Bundles of rice straw, roots and stems, soil, heat preservation and anti-freeze, after removal of snow (ice), should be immediately bundled with straw or 0.02-0.03 mm thick agricultural film, or bundled with straw and then agricultural film Parcel, better insulation effect. It can also be used to cultivate earth at the base of the trunk, with a height of 30-40 cm. When the temperature rises and the soil is opened, this method is simple and cost-effective.
Exclude the stagnant water in the low pear garden to prevent damage
In some low-lying areas, water accumulation occurs in the pear orchards. With heavier water, it is best to spray bactericide such as carbendazim after draining to prevent root rot and stem rot.
Complete pear tree pruning to avoid agricultural delays
Winter pruning, which is interrupted by rain and snow, should organize pear growers to complete field management such as winter pruning and pruning. Especially in the Yangtze River basin and its southern pear production area, the pruning task should be completed before the end of February, so as to avoid the loss of nutrients caused by pruning after the tree's storage and nutrition are returned.
Strengthen the management of frozen pears and restore the tree vigor
For pears that have been frozen lighter, four measures should be taken: “pruning and renewal, soil fertilization, mulching, pest control, etc., to restore the tree potential:
The pruning update is mainly based on the short-term updates of the lateral branches, and is completed before sprouting, so as to facilitate early shoots. To shorten or eliminate frostbite branches and branches broken by snow, leave more flower buds in order to prevent flowering frost, so as to ensure the output of this year and the growth of the tree. Branches that are continually pressed off by snow should generally be shortened or eliminated. However, if this area is missing branches, it can be protected by binding and promote wound healing; if there are more broken branches of young trees, the trunk should be subject to "dental injury". In order to trigger new branches; to support the depression of the branches should be supported or tied to raise the angle.
After cultivating in spring, timely cultivating loose soil, fertilizing and fertilizing should be applied to fertilization with thin fertilizer, mainly nitrogenous fertilizer, and the mixture of 0.2%~0.5% urea and 0.2%~0.3% potassium dihydrogen phosphate can also be combined with foliar spray. Spraying Tianda 2116, Borexin 481 or biogas slurry fertilizer before and after flowering promotes robust growth of the tree and enhances the ability to repair frostbite.
Laying mulch film to increase the temperature and film cover can effectively increase the ground temperature, so that the ground temperature of 5 cm above ground can be increased by 2°C~3°C, and the ground temperature by 20 cm can be increased by 1°C~2°C, which is beneficial to the recovery of frozen trees. At the same time, the phenology period of pears will also be advanced. Care should be taken to prevent frost during flowering.
Pests and insect pests prevent plant vigor after freezing injury, new shoots and new leaves are prone to insect pests such as roundworms and mites, and are prone to induce diseases such as ringworm, black spot, black spot, anthracnose, and dry rot. Strengthen the prevention and control of the above pests and diseases.
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A polymer whose molecular backbone contains aliphatic esters. In other words, the parent nucleus R of the dihydroxyl compound HO -- R -- OH is polycarbonate of aliphatic group (CH2) M, (CH2)O(CH2), -- CH2 -- C(CH3)2 -- CH2 -- etc. It is characterized by low melting temperature, mostly below 60℃, and narrow melting range, greater solubility, low mechanical strength, hydrophilic, poor thermal stability, low glass transition temperature. Most aliphatic polycarbonate have low molecular weight and are mostly viscous liquid at room temperature or microcrystalline substance at low melting temperature. It can be prepared from aliphatic dihydroxyl compounds with dicarbonate or photogasification. Most of them have little industrial value, so their application is very limited.
Aliphatic Polycarbonates Apc,Rigid Bioplastics Aliphatic Polycarbonates Apc,Adhesives Aliphatic Polycarbonates Apc,Binders Aliphatic Polycarbonates Apc
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