Reasons and Prevention Techniques of Physiological Dry Tip of Welsh Onion
We have been producing Biological Products for about 50 years. Tetanus Antitoxin is the main product of our biological products, and its market share in China is over 70%, more over, it's been exported to over 20 countries. It won the title of Provincial Excellent New Products in 1998, the New Products Gold Prize by the Southeast Asia Chamber of Commerce in 2001, and the Excellent New Products Gold Cup by the Seventh Asean Congress of Traditional Chinese Medicine in 2003.
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1. Acid soil causes dry tips. Neutral soil is suitable for the growth of onion, and the optimum pH is from 7 to 7.4. When the application of organic fertilizer is less, the application of ammonium sulfate and superphosphate will cause acidification of the soil, causing the onion leaves to be weak and the outer leaves to be yellow. Prevention and control measures: Apply enough organic fertilizer per mu and apply 150 kg of calcium oxide.
2. Drought causes dry tips. During the production process of onion, the soil is dry, and the water shortage of the plants easily leads to dry tips. Prevention and control measures: According to the different needs of the different growth periods of onion water, timely, adequate watering. Appropriate control of water at seedling stage, no refusal to water, 15 to 20 days, 1 small water; nutrient growth combined with topdressing, soil watering in time to ensure adequate water supply, so that the field of water retention at 70% to 80%; The first 10 to 15 days to control the water, so that the field capacity to maintain 60% to 70%.
3. Lack of trace elements causes dry tips. The lack of calcium heart tip yellow, physiological obstacles, lack of magnesium outer leaves yellowing. Prevention and control measures: It can be supplemented by external roots, such as spraying with 0.1% to 0.3% calcium nitrate and 0.1% magnesium chloride.
4. Dry tip caused by high temperature and frost damage. Onion growth temperature range is 7 °C ~ 35 °C, more than 35 °C when the tips of the leaves dry, below 7 °C first leaf tip cold damage by the cold, the tip of the white. Prevention and control measures: For the onion cultivation of green onions pay attention to water cooling; greenhouse cultivation to strengthen the ventilation, to prevent the emergence of high temperatures above 30 °C, to strengthen the insulation, so that the minimum temperature of not less than 7 °C.
5. Drizzle caused by dry tip. The agent concentration is too high, making the tip white and dry. The prevention and control strategy is to control the concentration of a reasonable liquid, spraying green wind 95 can ease the injury.
