Watermelon seedling spring tube "strain with the day"

Watermelon seedlings are sensitive to environmental conditions. Therefore, in order to cultivate melon seedlings in protected areas in the spring, corresponding measures must be taken to ensure the normal growth and development of melon seedlings according to the characteristics of climate change. Long-term low-temperature due to lack of light, melon seedlings Photosynthesis is very weak, malnutrition, slow growth, pale leaves, cotyledons off, easy to stiff seedlings and damping off, causing a large number of dead seedlings. Management measures: remove grasshoppers during the morning, clean the dust on the film, take a small drop of water in the film, maintain good transparency, increase the temperature, cover the grasshopper at night, if necessary, apply pesticides and prevent disease. The continuous rainy seedbed has high humidity, poor illumination, low temperature, decreased photosynthesis, and less accumulation of nutrients, but the respiratory depletion does not decrease, and the melon seedlings are weak and the disease is aggravated. Management measures: As long as it does not rain, during the day must be exposed, increase the scattered light, do not avoid exposing for several days, the surface can be shop 1 ~ 1.5 cm thick dry fine soil or vegetation ash, inside the pot to stop watering and spraying. At noon, proper ventilation on the lee side reduces the relative humidity. The haze weather is poor and the air humidity is high. The leaves of the seedlings are prone to water, and they are susceptible to anthrax and damping-off. Therefore, the foggy weather should not only seal the seedbed and avoid the intrusion of fog. It must also promptly remove the cover after the mist has completely dissipated, and properly conduct ventilation and light transmission. Snow cover weather cover good grasshoppers, moisturizing antifreeze. Immediately after the snow stopped, the snow on the film was cleaned so that the melon seedlings could see the light. For a long time, the temperature of the clear bed has risen sharply, and the melon seedling loses too much water too quickly, causing a physiological water imbalance, which leads to wilting, stagnation, and even death. Measure; Let the melon seedlings gradually see the light, early in the morning to expose the appropriate early, so that the melon seedlings see more light at a lower temperature, in order to have a longer period of adaptation to the glare. The temperature rises to a certain extent, can be covered with grass cover on the seedlings to light cover, can also spray 10 ~ 20 °C warm water to add water loss, ease withering. It can also be ventilated as early as possible before the exposure to clear the temperature in the seedbed. Cold winds still cover the grass every day, so that the melon seedlings have a certain time to see light, but it should be properly exposed early cover, generally exposed at 11:00, cover before 2 pm, at night to strengthen the insulation measures against cold.

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