1. No emergence or very few sprouts. Causes: (1) The seeds lose their germination power; (2) The ground temperature, the temperature is too high or too low, the seedbed ventilation is poor, the bed soil moisture content is too high or too low, bed soil fertilization is too much, and the soil is thick. Rescue methods: (1) do germination test and seed disinfection work; (2) bauxite inspection, if the seed buds are dead, they should be sowed immediately; if bed soil bacteria infected seedlings, should change the bed to germination and then broadcast; (3) If When the seed germination rate is high at the time of sowing and the germination potential is checked in the soil, the obstacles must be eliminated by improving the environmental conditions. 2. Poor emergence, long intervals. Causes: (1) Inconsistent temperature, uneven bed surface, and varying thickness of cover soil; (2) Poor germination potential; inconsistent maturity, partially damped storage, mixed seeds; (3) seedbed leaking into rainwater, The underground pests are partially damaged and the chemical fertilizers mixed in the bed soil are uneven. The methods of rescue are as follows: (1) To create good conditions for seedling raising, to make the bed level as flat as possible, to finely sew bed soil and sterilize; (2) To do germination test before sowing, Avoid the mixing of new seeds; (3) The cover membrane of the seedbed should be tight, leave a gap, mix the seed before sowing, and the organic fertilizer and chemical fertilizer in bed soil should be mixed. 3. Top cover and cap seedlings. Causes: (1) Bottom water is too small before sowing and the humidity on the surface is not enough. After germination, the mucilage between the seed coat embryos is dried and loses its lubrication. The seedlings and shells extend out of the ground; (2) Too thin, the pressure is not enough, with a cap out; (3) The seeds are full, there are incomplete and damaged, or long storage period, poor sprouting force, it is not easy to break the seed coat, so that the top cover unearthed. Rescue methods: (1) Sprinkle some water in the morning with a watering can or sprinkle with moist fine soil; (2) Seed sowing with new seeds or seeds with high germination rate; (3) Manually pick the seed coat. 4 drug seedlings. Causes: Excessive doses, high concentrations, and dry seedbeds. Rescue method: Strictly grasp the drug and drug concentration, the application should be uniform, the seedbed of the drug, in the sowing before planting more water to keep the soil moist. If any harm is found, the water should be sprayed in time to dilute the concentration of the drug. It is also possible to divide the seedlings in advance so that the seedlings can leave the original seedbed to ease the injury. 5. Root seedlings. Causes: Soil moisture in the seedbed is often saturated, with high humidity and lack of air. Rescue methods: (1) control the watering of the seedbed; (2) prevent flooding. Once roots occur, they should be promptly ventilated and drained; (3) increase the amount of evaporation; (4) dry soil to absorb moisture; (5) diligently tilling loose soil to increase the permeability.
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