A: It is mainly caused by zinc deficiency. When zinc is deficient in zinc, the veins are chlorotic, the leaves are erect, the internodes are shortened, the plants are short, and the growth is slow or stopped. In the severe zinc deficiency area, 7 days after emergence of the corn , yellow-white stripes appear in the middle of the veins, white spots appear on the leaves or outside the leaves, and they are rapidly enlarged to be translucent, so it is called white mosaic disease. When the plants grow up, chlorotic streaks are formed in the middle of the veins of the old leaves, and the leaves and sheaths become purple, which in turn forms brown and even die.
Planting corn on calcareous soil is prone to white mosaic disease. This is because calcareous soils are mostly alkaline and zinc is difficult to dissolve in the soil. In addition, phosphate-rich or large-scale application of phosphate fertilizer blocks, due to the weakening of the absorption capacity of zinc by corn, can also lead to zinc deficiency. In general, the effective zinc content of the subsoil of most soils is low. Therefore, when leveling the land or building terraces, if the topsoil is not well restored, zinc deficiency is also likely to occur. In addition, white mosaic disease often occurs when corn is grown in old wheat fields and sugar beet fields.
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Hydrofluorocarbons (HFCs), organic compounds that contain fluorine and hydrogen atoms,
are the most common type of organofluorine compounds. They are commonly used in air conditioning and as Refrigerants [4] in place of the older chlorofluorocarbons such as R-12 and hydrochlorofluorocarbons such as R-21. They do not harm the ozone layer as much as the compounds they replace; however, they do contribute to global warming. Their atmospheric concentrations and contribution to anthropogenic greenhouse gas emissions are rapidly increasing, causing international concern about their radiative forcing.
Fluorocarbons with few C-F bonds behave similarly to the parent Hydrocarbons, but their reactivity can be altered significantly. For example, both uracil and 5-fluorouracil are colourless, high-melting crystalline solids, but the latter is a potent anti-cancer drug. The use of the C-F bond in pharmaceuticals is predicated on this altered reactivity.[5] Several drugs and agrochemicals contain only one fluorine center or one trifluoromethyl group.
HFCs(hydro-fluorocarbon)
Hfcs(Hydro-Fluorocarbon),High Fructose Corn Syrup,Fructose Corn Syrup Hfcs,High Fructose Syrup
Quzhou Xiecheng Chemical Co., Ltd. , http://www.xcrefrigerant.com