Spring vegetable seedlings often Simiao phenomenon, its causes and control strategies are: 1, mainly due to disease Simiao seedbed before planting, not nutrition soil disinfection; after the plants have not unearthed timely spraying sterilization; and seedbed temperature, humidity, improper management, It causes damping-off and blight. Control measures: (1) Disinfection of seedbed and nutrient soil. Use 50% carbendazim wettable powder 8-10 grams per square meter of seedbed, mix with the appropriate amount of semi-dry fine soil, evenly spread in the noodles, soaked soil mix well after sowing. When preparing nutritious soil, add 50% carbendazim WP 80-100g/m3 of nutrient soil, mix well and fill with nutrient solution. (2) Strengthen seedbed management. After 80% of the seedlings are unearthed, spray 80% of Dasheng M-45 WP 500 times to sterilize and prevent disease. Spray once every 7-10 days thereafter; timely uncover the grasshopper and ventilation to prevent temperature inside the seedbed. Excessive humidity causes disease. 2. Insect pests, seedlings, and other underground pests infested in a large number of underground pests cause serious damage and cause dead seedlings. Prevention and control measures: Use 80% of dichlorvos EC 1000 times to irrigate the soil surface of the seedbed to prevent lice. Use 80% dichlorvos emulsifiable concentrate 100 times solution or 50% phoxim 50 times solution, mix and crush the fragrant bean cakes, wheat bran, etc. into baits. Sprinkle on the soil surface of the nursery bed to kill. 3. When the seedling bed soil is sterilized when the medicine is killed or killed, the dosage is too large or the bed soil is too dry after sowing and the spraying concentration is too high after the seedlings are unearthed, which may easily cause phytotoxicity. Prevention measures? Shang good meal expected? Ash mortar shelter extravagant ┠Hom ??? ¨Ò Yue Jiao Jiao Branch discretion Shang? -10 grams or 100 grams per cubic meter nutrition soil is appropriate ?? R┘ chain? Tridacna take significantly less Shang glass? ? 3 lag Liao Long? hydroids? gray ?? black and slightly injure S discretion Fei Bei beam midges Le tail] Jing κ Paul? reeling ┡ǘ sewing? chamber playing? Yuan Lang Chang confused 4, low soak the root seedlings died seedbed temperature, humidity and light Insufficient, the respiration of seedlings is hindered and the ability to absorb water is reduced. Especially in the cold, wind and snow weather, not seedbed ventilation, when the seedlings growing weak, vulnerable. Control measures: To control the humidity of the seedbed. When seedbed watering, depending on soil moisture and weather conditions, every watering should not be too much to avoid excessive humidity seedbed. Once roots occur, they must be promptly ventilated and ventilated to promote evaporation of water. It is also possible to apply fine dry soil or ash on the seedbed to absorb moisture. 5. The cold-killed seedlings were temporarily caught in the cold and low temperatures. They did not take cold-proof measures in time, or improper measures to prevent cold, which resulted in freezing and death of the seedlings. Prevention measures: (1) Warming and freezing protection. During the nursery period, attention should be paid to changes in the weather. At the time of the cold and low temperatures, cover the plant in a timely manner and keep it as dry as possible to prevent it from being wetted by rain and snow. Temporary warming measures may be taken if conditions permit. (2) Improve the means of raising seedlings. The use of artificial temperature control seedlings, such as electric hotbed nursery, heating greenhouse nursery. (3) Scientific management. Increasing light and promoting photosynthesis and nutrient accumulation are important measures to improve the cold resistance of seedlings. Appropriate control of watering and reasonable application of phosphorus and potassium fertilizers can also improve the cold resistance of seedlings. 6. When air-dried dead nursery bed is ventilated, direct convection of cold air, or sudden film release, and cover being blown by strong wind will cause the hot and cold air inside and outside the seedbed to change too much. The temperature and humidity of the air suddenly drop and cause seedling dehydration. Weary and dead. Prevention and control measures: When the seedbed is ventilated, it is necessary to open the vent on the downwind side; the ventilation should be from small to large, so that the seedlings have an adaptation process; in the windy weather, pay attention to the cover tightly and prevent the wind from being blown open.
In this category, we offer a wide range of Urine contaciner and Shit cup for transporting samples and carrying out various laboratory examinations. All of them are sterilized.
Furthermore, you are also offered other vessels for medical purposes, such as Ipette Electronic pipette, Pipette Tips, Cuvette cups, Plastic Test tubes and Urine analyzer. If you can not find the one you need, please contact our customner service directly for more details.
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