How to prevent greenhouse polyposis in greenhouses

In winter and spring shed (room) tomato cultivation, due to factors such as low temperature, fertilizer, water use and improper cultivation and management, tomato growth is slow, and the top and top leaves are gathered together to form a polyposis. Tomatoes suffering from polyposis generally show growth at the top and the leaves are bunched together. The growth is slow or stagnant. The lower leaves are hypertrophic, the stem sections are thick and hard, the nodes are short, the tomatoes have more flowering but the result is less, or not at all. Fruit setting will seriously affect tomato yield. The main causes of this disease are the following: First, the temperature of the shed (room) is too low, the daytime temperature in the shed (room) is below 20°C for a long time, and it is lower than 12°C at night. The second is the long-term lack of water in the soil, and the relative humidity is less than 60%. It is too dry and the seedlings take too long. The third is nitrogen deficiency and slow growth. The main control methods: Science temperature control shed (room) to maintain the temperature during the day 24-25 °C, 20-15 °C in the middle of the night, the next night to 15-12 °C the next morning. After reasonable watering, the relative humidity of the soil is maintained at 65-80% after the seedlings are established until the fruit setting period, and watered once every 10-15 days. During the fruit enlargement period, the relative humidity of the soil was maintained at 75-85% and watered once every 7-10 days. Timely Topdressing When the growth of plants is found to be slow and the top growth is stagnant, 15 kg of diammonium phosphate, 15 kg of potassium sulfate, and 10 kg of urea should be immediately combined with watering per acre to be applied with the watering.

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