Wearing hat seedlings: After the symptoms of the seedlings unearthed, the mid-leaf caught the embryo leaves do not fall off, resulting in the embryo leaves is difficult to open, photosynthesis is affected, poor growth and development of weak seedlings. Prevention and control measures: First, apply organic fertilizer and pouring foot-bottom water, cover soil properly after sowing; Second, timely cover insulation film and straw curtain.
Root shoots: The symptoms are that the roots do not grow or few new roots or adventitious roots are found. The root bark becomes brown and gradually rots, causing the plants to turn yellow and wilting. Prevention measures: First, maintain proper temperature, choose a good breathable land for seedbeds, increase the temperature of the soil; keep the temperature of the seedbed at 20°C—25°C during the day and 15°C or more at night. The second is to reduce the humidity inside the shed and do it in the seedbed. The third is to pay attention to increased lighting, to choose a place with adequate light to build a seedbed. The fourth is to give enough farmyard fertilizer to cultivate fertility and cultivate strong seedlings. It can also increase ground temperature and reduce disease occurrence.
Actually seedlings: The symptoms are fine stems, long internodes, thin leaves, and pale color, mainly caused by high temperature and high humidity. Control methods: First, according to the requirements of temperature and humidity seedlings, timely ventilation, especially at night, the temperature should be appropriately lower; Second, we must ensure that the transparent cover clean, try to increase the light intensity and light time; third is to prevent seedlings are too crowded To ensure adequate supply of nutrients for seedlings.
Aging seedlings: The symptoms are small seedlings, short stems, and the roots are not easy to regenerate new roots, and the leaves are small and thick. The cause is seedling age or seedling time is too long. Preventive measures: In the management of nursery, we must strictly control the seedling age, and the seedlings should preferably adopt the method of controlling the temperature without controlling the water.
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