In order to prevent sudden low temperatures and cold waves, the extent of frost damage in citrus fruits should be reduced as much as possible. 1. Select a suitable micro-climate environment for the establishment of the park: For the cultivation of citrus on the slopes of the Qiulin slope, the southern slope of the sheltered area should be chosen for sheltering against the sun. The windbreak forest belts should be built on the east, north and west sides of the orchard. Windbreaks can be used for evergreen tree species such as camphor and privet. 2. Selection of citrus varieties with strong cold resistance: Citrus is a genus of genus Evergreen, which is a subtropical evergreen tree belonging to the genus Citrus. It has a wide variety of varieties, and the cold resistance between varieties is also very different. Among the citrus varieties that have been planted locally, their cold resistance from strong to weak is as follows: Wenzhou Tanggan, Nanfeng Tangerine, å´ç å´ç (2) ç“¿ (16) 痈蹋ń塾氤 痈蹋ń塾氤 å’唬 ( (4) Frame V æƒâ‰¡è¡¿ è´¨ è´¨ è´¨ ç“¿ ç“¿ ç“¿ (16) ç—ˆ ç—ˆ 丸 丸 丸 ( ( ( ( ( ( (17) 埂 / / / / / / 3. Apply base fertilizer in a timely manner: The time for applying citrus fertilizer to citrus should be completed locally from late October to mid-November. Prematurely, it is necessary to promote late-autumn budding, consume nutrients to reduce the cold resistance of the tree, too late due to low temperature is not conducive to root wound healing. 4. Irrigation in the garden: In the middle and late November of the year, the citrus in the garden began to be filled with water, and in the absence of rain in the winter, the soil in the garden should be kept moist. According to the weather forecast, fill the water once more in 3-5 days before the onset of the cold wave. 5. The main stem of the plant is coated with white earth: the main stem is painted white with 30-40% lime liquor, and the ground plant and the rootstock are grafted to the soil and the earth pile is over 30 cm high. Tubaituo can reduce the damage degree of melting snow and the occurrence of post-frozen cracking disease. 6. Spraying steam and heat-retaining agent: spray the entire canopy with 200-fold steam-inhibitor and heat-insulating agent 5-7 days before cold air comes. Repeat spraying immediately after the cold wave. 7. Canopy cover: When the minimum temperature drops below zero, the tree canopy is covered with non-woven fabric and plastic film. After the cold wave has turned fine, cover can be removed during daytime temperatures above 5 degrees Celsius and covered with frost at night. Under conditions permitting, a simple plastic greenhouse insulation can be built before the end of November. 8. Clear the canopy of the snow: In the event of heavy snow, shake the canopy branches in time, shake down the snow on the canopy, and avoid the snow from breaking the branches. 9. Lay lime on the ground: In the clear night after snow, the orange granules in the orange orchard are sprinkled with 50-100 kg of granular quick lime. Quick lime emits gas by decomposition can increase the park temperature, reduce the harm of radiation cooling. 10. Foliar spraying fertilizer spray: After the cold wave, select sunny noon (between 10:00 am and 3 pm) spray water once every 1-2 days, 5-6 times in a row. Spray 0.3% urea, 10% 0.2% potassium dihydrogen phosphate solution once every 7 days, continuously for 3-4 times. Reduce the dehydration of citrus leaves after dehydration and foliage to restore the tree vigor.
Organic raw materials refer to the petrochemical industry that uses petroleum and natural gas as raw materials, and the industry to produce or fractionate various organic Chemical Products from the raw material gas after coal gasification and the coal tar recovered by dry distillation from grain fermentation to produce alcohol or solvent. In my country's organic chemical industry, the route of producing acetylene from calcium carbide from coal, the route of coal gasification to synthesize methanol and formaldehyde, the route of recovering benzene, naphthalene, and anthracene from coal tar, and the route of fermenting and distilling grains as raw materials to produce alcohol were developed.
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