There are many reasons for the occurrence of red seedlings. The summary is mainly as follows. First, the plant is deficient in phosphorus. Phosphorus deficiency in the soil can not meet the growth needs of maize seedlings, root growth and development are hindered, and seedling growth is slow. As the phosphorus content in the seedlings gradually decreases, the leaves turn from dark green to red or purple. The second is the accumulation of water in the field. Poor drainage in the field, large soil moisture, affecting the respiratory and metabolic effects of the root system, the growth of the root system is blocked, resulting in malnutrition and redness and purple. Third, underground pests are harmful. The roots of the seedlings are bitten by underground pests, and the ability to absorb water and absorb fertilizer becomes weak, which causes the seedlings to weaken and form red seedlings. The fourth is phytotoxicity and pests. The phytotoxicity, insect pests, etc. cause the sugar metabolism in the corn seedlings to be blocked, and a large amount of anthocyanins are produced, thereby forming a purple-red seedling. Five is other reasons. For example, if the soil is too sticky, the planting is too deep or shallow, and improper fertilization causes "burning seedlings", improper treatment of the pesticides causing seedling poisoning, etc., will lead to purple red seedlings.
Control measures: 1. Early application of phosphate fertilizer, mainly based on quick-acting phosphate fertilizer, 10-15 kg of calcium phosphate per acre, combined with insecticide spraying 1% of superphosphate leaching solution; 2. Leveling the land, excavating the drainage ditch To make the rain stop and dry, there is no water in the field. 3. Do a good job in the prevention and control of underground pests, so as to soak seeds or seed dressing, it is best to use coated seeds. 4. For shallow or early seedlings, watering should be timely, cultivating loose soil to protect the seedlings.
If red seedlings have appeared in the field, spray 300 times of potassium dihydrogen phosphate to the leaves 3 to 3 times, spray once every 3 days, or spray 1% superphosphate solution (clear solution). It should be specially reminded that potassium dihydrogen phosphate must be used genuinely. There are many very cheap potassium dihydrogen phosphates on the market. In fact, it is magnesium sulfate. Farmers must be careful when purchasing.
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Fluorine-Containing Benzaldehyde
Most products of Fluorine-Containing Benzaldehyde are a pale yellow liquid. They are playing an important role in fine chemical intermediates, is used as the main raw material for the synthesis of a variety of pesticides, pharmaceuticals, surfactants, polymer monomer mildew. As used in medicine synthesis antihypertensive drugs, antipyretic analgesic anti-inflammatory drugs, anti-cancer drugs, muscle relaxation drugs for synthesizing fluorine cypermethrin, fluorine chlorobenzene daisy cool in pesticides, fluoride and styrene, wherein the polymer of styrene monomer to fluorine can be widely used in the manufacture of the recording material, a thermoplastic resin coating, liquid crystal materials. Currently new miticide is effective pesticide products which is the main raw material of Fluorine-Containing Benzaldehyde.
Containing Benzaldehyde,5-Dichlorobenzaldehyde,3-Bromo-5-Fluorobenzaldehyde
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