Winter and spring vegetable production often encounters the hazards of cold weather such as low temperature, frost, frost, snow, etc. Especially in recent years, the temperature difference between day and night in winter and spring has changed greatly. If improper protection, it often leads to greater economic losses. Combining practical experience, introduce ten cold protection measures: Winter irrigation: 1 to 2 days before the invasion of cold currents, and flooding with clear weather. In winter irrigation, it is necessary to pour enough water and water, and the field water can be infiltrated on the same day. After the irrigation, it is time to seize the favorable opportunity to carry out loose soil insulation. Fertilization: Use sunny, use cattle, pig manure or compost and other warm fertilizers 100 kg to 150 kg, applied to the vegetable roots, you can increase soil temperature 2 °C -3 °C. Cultivate soil: Before combining the cultivator with the cultivator, the smashed soil is cultured in the rhizosphere of the vegetable, which can loosen the soil and protect the root system directly. The cultivator depth should be 7 cm to 10 cm. Smoke smoke: piled up with weeds, straw, dead branches, fallen leaves, etc. Except for the ignition, the rest was lightly compacted with dry and fine yellow mud. Before the frost came, the smoke at the ignition point of the top wind became fumigated. If there is an open flame, then seal it with fine soil, so that it can not only disperse cold currents, but also make fire and soil. Precipitation: For low-waterlogging and other high groundwater table vegetable fields, pay close attention to open the "three ditch" to ensure that the gutters open, in order to reduce the water level, remove waterlogging, increase soil temperature, and promote vegetable growth. Pouring feces: before the advent of freezing, per acre with 400 kg of 500-kilograms of diluted faecal water to improve the ability of freezing. Nitrogen control: appropriate reduction in the amount of nitrogen fertilizer in seedling stage, avoid partial nitrogen fertilizer, so as to avoid the growth of young plants, cold resistance is poor. Top dressing is early, in order to promote vegetable seedlings. Before the low temperature, it is not suitable to apply quick-acting nitrogen fertilizer. It can spray 0.2% potassium dihydrogen phosphate 2-3 times. Sprinkle ash: Before the advent of low temperature, sprinkle a layer of ash on the vegetables and the ground, which can prevent cold and prevent freezing, increase nutrients, and have better control effect on the root rot of cruciferous vegetables. Coverage: In the afternoon before freezing, cover with straw or other coverings sparsely covered on the gills or vegetables, must not cover all the vegetables, so as not to affect photosynthesis. It is advisable to cover 100 kg of rice straw per acre. Spraying oil vapor suppressant: Select 30- to 40-fold oil spray inhibitors on plants in sunny days before the onset of the cold current. This will not only form a layer of invisible cold film on the leaves, but also reduce the transpiration of the leaves. To protect the body temperature of the vegetables and achieve the purpose of preventing cold.
Fluorine-Containing Methylbenzene products can be used as herbicides in the manufacture controlling wheat fields, cotton fields and other broadleaf weeds and perennial weeds. It can also be used in the manufacture of antipsychotics drugs.
The Fluorine-Containing Methylbenzene products must be kept under seal, once exposed to light will immediately cause discoloration. It should also be stored in a cool, ventilated warehouse, away from fire and heat. Compartment temperature should not exceed 30 ℃. And make the appropriate technical measures for fire and explosion. Products will Decomposition by high fever and emit toxic gases, such as carbon monoxide, carbon dioxide, hydrogen fluorid. Due to ts vapor is heavier than air, it can spread from low place to far away places. In case of fire conditions, should not fire with water. In case of a small amount of leakage should be evenly sprayed with dilute hydrochloric acid. In case of large spills should build a causeway or trenching asylum. The transfer pump to tankers or exclusive collector, recycling or shipped to the waste disposal sites.
Fluorine-Containing Methylbenzene
Containing Methylbenzene, 5-Fluoro-3-Nitrotoluene,2-Bromo-5-Fluorobenzotrifluoride
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