Cultivate “strong” celery seedlings and do a good job in seedling management

In the early stages of celery seedling growth, the season is characterized by high temperatures and heavy rainfall. If not properly managed, this can lead to weak seedlings or even death due to disease. Last summer, many celery seedlings were lost due to excessive rain and subsequent rot. To ensure healthy growth, what should farmers focus on during the seedling stage? Recently, a reporter visited Guihe Village in Datian Town, Shouguang City, to learn more about how local vegetable growers are managing their celery seedlings. First, it's important to lower the temperature. Celery thrives in cooler conditions, with an ideal emergence temperature ranging between 15°C and 20°C. The temperature in the seedbed should not exceed 25°C. However, as summer approaches, outside temperatures often rise above 30°C, which is not favorable for celery growth. To combat this, farmers should implement measures such as shading and misting to keep the temperature under control. Second, thinning the seedlings is essential. When the plants have developed their first true leaves, it's time to remove overcrowded, diseased, or weak seedlings. Adjust the spacing to around 2–3 cm to allow for better air circulation and reduce competition for nutrients. At the same time, weeds should be removed from the field to improve the growing environment and promote healthier growth. Third, drainage is crucial. Summer brings frequent heavy rains, and poor drainage can lead to waterlogging, which is particularly harmful to celery. Since the roots of celery are delicate, proper drainage systems must be in place. Farmers should dig ditches around the seedbeds to ensure that excess water can drain away quickly after each rain, preventing root damage. Fourth, pest and disease prevention should not be overlooked. High humidity and warm temperatures create ideal conditions for diseases like damping-off and soft rot. Soft rot is a bacterial disease that causes the seedlings to rot and emit a foul odor. When humidity is high, these diseases can spread rapidly. Therefore, it's important to take preventive measures early on. Farmers should apply protective sprays such as 70% agricultural streptomycin diluted 3000 times, 3% zhongshengmycin at 1000 times, or 33% potassium oxonate at 800 times to control the spread of diseases effectively. By following these four key steps—temperature control, proper thinning, effective drainage, and timely disease prevention—farmers can significantly improve the health and survival rate of their celery seedlings, ensuring a successful harvest.

Piston and Rod Seals

Piston Seals and Rod Seals are important seals used in mechanical equipment. Their main function is to prevent liquid and gas leaks and ensure the normal operation of mechanical equipment. Piston seals and rod seals are usually used in hydraulic and Pressure system, such as hydraulic cylinders and Pneumatic cylinder. The quality and performance of these seals directly affect the efficiency and lifespan of mechanical equipment.

The classification of piston seals and rod seals is mainly based on their material and design structure. According to the different materials, they can be divided into rubber seals, polyurethane seals, polytetrafluoroethylene seals, metal seals, etc. According to the different design structures, they can be divided into unidirectional seals, bidirectional seals, rotary seals, etc.

Rubber seals are a common type of seal, and their main material is rubber. Rubber seals have good sealing performance and wear resistance, and are suitable for medium and low pressure hydraulic systems and Pressure system. Polyurethane sealing element is a high-performance sealing element, and its main material is polyurethane. Polyurethane seals have high wear resistance, high temperature performance and high pressure performance, and are suitable for high-pressure hydraulic systems and Pressure system. PTFE sealing element is a corrosion-resistant sealing element, and its main material is PTFE. PTFE seals have excellent corrosion resistance and high temperature resistance, making them suitable for fields such as chemical and food processing. Metal seals are a type of high-temperature and high-pressure seal, mainly made of metal. Metal seals have high temperature and high pressure performance and corrosion resistance, and are suitable for high temperature and high pressure hydraulic systems and Pressure system.

Unidirectional seals and bidirectional seals are classified based on different sealing directions. A unidirectional seal can only prevent the leakage of liquid or gas from one direction, while a bidirectional seal can prevent the leakage of liquid or gas from both directions. Rotating seal is a type of seal that can rotate and is mainly used for sealing rotating shafts. Rotary seals are divided into unidirectional rotary seals and bidirectional rotary seals.

Overall, piston seals and rod seals play a very important role in mechanical equipment. Choosing appropriate seals can improve the efficiency and lifespan of mechanical equipment, reduce maintenance costs and downtime. When selecting seals, it is necessary to comprehensively consider factors such as the working environment, pressure, and temperature of the mechanical equipment to choose a suitable seal.

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DG Zhongxingshun Sealing Products Factory , https://www.zxs-seal.com