At present, it is the nursery stage of greenhouse vegetables and greenhouses. As our province eliminates warm winters and less rain and snow, it is warmer in spring earlier, and many places are ready for planting in greenhouses. However, according to many years of meteorological conditions, at present, although the temperature has risen, the possibility of spring snow and frost is relatively large, and the ground temperature is not yet stable, which is not good for slow seedlings. Therefore, in the near future, seedling cultivation should focus on enhancing the low temperature resistance and drought resistance of vegetable seedlings.
First, low temperature resistance exercise. Practice has proved that after low-temperature exercise, solanaceous vegetable seedlings can significantly improve adaptability, can endure common frost, and slow seedlings after planting, and early hair growth. However, low-temperature exercise should be carried out gradually, and the temperature should not be reduced too much at one time to prevent the seedlings from being frozen. Generally, the temperature of the seedbed is reduced about one week before the seedlings are planted. Try to make the tomato seedbed 15 ℃ ~ 18 ℃ during the day, 10 ℃ ~ 13 ℃ at night; eggplant pepper seedbed 18 ℃ ~ 25 ℃ during the day, 13 ℃ ~ 15 ℃ at night.
Second, drought resistance exercise. Keep the surface soil of the seedbed more dry and less wet. That is, the seedbed is not very dry and generally does not water. If the seedbed is short of water before refining, you can water it in small amounts. At the same time, try to do a good job of ventilation, reduce the air humidity and soil humidity of the seedbed. Under the premise that the temperature of the seedbed is not affected, try to increase the ventilation openings and extend the ventilation time.
Third, pay attention to two issues. First, the seedling refining time should not exceed one week. If the time is too long, the seedlings may age and form aging seedlings, which are not easy to slow down after planting. Second, if the humidity of the seedbed is low and there is less water loss, the humidity of the seedbed will not fall; too much watering before refining will not be conducive to the seepage of the seedbed soil, and the humidity of the seedbed will not drop.
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