In winter and spring, the weather is cold, the temperature is low, and the light is weak. Therefore, the following issues should be noted when cultivating age-appropriate seedlings. The minimum temperature for preventing the germination of fruit and vegetable vegetables is 11-12°C, and 0-4°C for leafy vegetables. Under normal circumstances, no seedlings appeared after 7 days sowing, indicating that the seeds had rotted. The preventive measures are to select sowing in sunny and warm weather, use electric hot-bed or hot-breeding nursery, thicken the cover, etc. to increase seedbed temperature. To prevent the formation of a "hat-wearing seedling" and a "hat-wearing seedling," the cotyledon is used to unearth the belt out of the soil, like a hat on the top of the cotyledon, which affects the normal development and photosynthesis of the cotyledon. The reason is that the bed soil is too dry and the soil is too thin. Preventive measures are that the bottom water of the seedbed should be poured, and the thickness of the cover soil should be appropriate. Generally, small seeds are covered with 1-1.5 cm of soil, medium seeds are 1.5-2 cm, and large seeds are 3-4 cm. Before sowing until emergence, the bed covers the mulch to keep the soil moist. To prevent cold roots, roots, and roots from burning bed soil organic fertilizer and bed to soil ratio is generally 1:1. The use of organic fertilizers that have not been decomposed or excessive fertilization may cause burning of roots. After the seedlings have been burned, the edges of the leaves are yellow and the leaves are shriveled. Once root burning occurs, water can be poured into the pot to reduce the concentration of fertilizer and increase ventilation and humidity. The roots of cold roots and roots are caused by the low temperature and high humidity of the bed soil. Its performance is that the leaves are wilting and the seedlings stop growing. The preventive measures are to increase the seedbed temperature, reduce the amount of watering, conduct cultivating tillage, and reduce the humidity through ventilation. There are two reasons to prevent the formation of rigid seedlings: First, early spring cold, lower seed bed temperature, slow root growth to form rigid seedlings; second, in the late stage of nursery, in order to curb the leggy, use less water or not water As a result, the drought-induced root development of axillary seedlings has been severely affected and a rigid seedling has formed. Preventive measures are to increase seedbed temperature in the early stage and promote root development. In the late period of nursery, if the seedlings are grown, the seedbed temperature should be lowered, the light intensity and light time should be increased, the ventilation should be increased, and no watering or watering methods should be used to control seedling growth. To prevent flash seedlings from growing in spring as the outside temperature and the temperature inside the nursery bed increase, we need to increase ventilation. When the air temperature in the shed is higher than 25°C, if the air is blown from the bottom of the shed, the sweeping wind will hurt the seedlings. This phenomenon is called flash seedlings. Prevention measures include timely ventilation when the shed temperature reaches 20°C. When the shed temperature is higher than 25°C, it is necessary to pull ventilation, that is, to ventilate at the height of the shed, and adjust the seedbed temperature by using the size of the air outlet and the length of the air release time. Do not ventilate the shed. Preventive measures to prevent dragons from being leggy prevent leggy growers from increasing ventilation, prolonging ventilation time, increasing light intensity and low-temperature training, and spraying plant growth regulators (such as chlormequat, etc.) to inhibit them. Chlormequat can also enhance seedling growth. The cold resistance and disease resistance.
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