Astragalus root is a common disease in the period of growing vegetables. The main causes of the disease are as follows: 1. Low temperature, the ground temperature is lower than 12°C, and roots will occur when the duration is long. Long-term low temperature of 5 °C ~ 6 °C, especially at night low temperature, resulting in the growth point to stop growing, the old leaves edge gradually become brown; 2. Excessive soil moisture, poor ventilation, root anoxic asphyxia.
Control methods: 1. Seedlings should be flattened to prevent flooding; 2. Strengthen the ground temperature management during the nursery period to avoid undergrowth or over-humidity of the seedbeds, and correctly grasp the time of air release and the amount of ventilation; 3. Use the electric heating line for seedling control Seedbed temperature is about 20°C, generally not lower than 15°C. 4. After the occurrence of slight rooting, it is necessary to loosen the soil immediately, ventilate and drain moisture, and also sprinkle some fine dry soil or ash to absorb moisture, and increase the temperature in time.
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