When the temperature rises, it becomes highly favorable for earthworm growth and reproduction. However, during the intense summer heat, it is essential to implement cooling measures to keep the temperature of the earthworm bed below 30°C, which is critical for maintaining high production levels in summer. The following strategies can be applied:
1) Shading: In practice, using straw curtains made from wheat stalks and rice straw proves more effective than other methods like climbing plants or using rapeseed pods. The shed should be constructed facing south and low on the north side, with a straw curtain hung from the center. A grass curtain should also be placed over the bed. It is best to cover the area with water hyacinths, water peanuts, and green grass. Testing has shown that when the ambient temperature is 34°C, the temperature 6 cm below the surface of the bed reaches 30°C. With a 40–50 cm layer of water peanuts, the temperature drops to 28°C, while an old mat alone without a shed results in 35°C. Therefore, after setting up the structure, covering the bed with straw curtains—especially water hyacinths and water peanuts—can significantly cool the environment. This not only promotes faster earthworm growth but also enhances their reproductive capacity.
2) Trampoline Grass: As temperatures rise, it is important to cover shaded areas with straw curtains. Using water hyacinths, water peanuts, and fresh grass is recommended for better cooling effects.
3) Watering for Cooling: During high-temperature periods, watering once daily in the afternoon helps create a humid environment at night, encouraging earthworms to come to the surface for feeding. If possible, watering twice a day—either earlier or later—is even better. Avoid using excessively hot paddy water or heavily polluted industrial wastewater. By combining these cooling techniques with proper vegetation, the temperature of the earthworm bed can be kept below 30°C, preventing heat-induced dormancy and ensuring consistent yield.
In summary, earthworm farming should be adapted based on local climate conditions. Appropriate measures should be taken to either increase or reduce temperature, ensuring the trampoline remains within the optimal range for growth and reproduction throughout the year.
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