During the rice seedling period, the greenhouse must be paid attention to when it is ventilated. Otherwise, the humidity and temperature of the seedbed will be different, which will lead to the death of the seedlings. The following is the correct greenhouse ventilation technique shared by the small series, and the growers pay attention to it.
Xiaobian recently saw many farmers consulting, saying that what should be done when the seedbed is humid during rice seedlings? Is it ventilated? What are the related issues to pay attention to? The welfare has arrived. Here is the ventilation technique for rice seedlings.
1, the purpose of ventilation in greenhouses is to reduce the temperature inside the shed, add bed temperature, add air activity in the shed, clean moisture, prevent and control the seedlings, so that the seedlings can learn the outside temperature as soon as possible, and the quality of the transplanting. After the emergence of rice, the rice should be stopped according to the temperature inside the shed and the outside temperature.
2, the method of ventilation in the greenhouse Nowadays, there are shed ventilation in the greenhouses, ventilation of small windows, and ventilation methods for the shoulders of the roller blinds. It has been proved that the shoulder of the roller blind is best ventilated, and the ventilation of the shed and the ventilation of the small window have gradually been replaced. The ventilator has a cold air that is not directly blown on the seedlings, and plays a role in protecting the seedlings. The damage to the seedlings is small, the ventilation is thorough, and the cooling is fast, which is beneficial to the cultivation of strong seedlings and the like.
3, the principle of greenhouse ventilation should be from 5 am to 5:30 in the morning, "the sun comes out, first open a small mouth, then open a big mouth", "first do not, then the front", "sunny pass, rainy days must pass" and other standards Stop ventilation.
4, the correct ventilation method is sunny in the morning, closed before 4 o'clock in the afternoon, assuming that the noon temperature is the highest when the ventilation is stopped, the seedlings are hot and cold, easy to attack the bacterial wilt; the vents should be changed with the leaf age changes The venting position should also be communicated to prevent long-term ventilation and cause the seedlings at the near-air outlet to be dwarfed due to low temperature. Rice 1 leaf 1 heart period small ventilation, greenhouse temperature is not higher than 28 ° C; 2 leaves 1 heart period ventilation, greenhouse temperature does not exceed 25 ° C; 3 leaves 1 heart period to the rear of the large ventilation, the greenhouse shed film The shed head should be a protective skirt. The temperature in the shed is around 23 °C. The 3 leaf period will follow the standard of "Ning cold and not hot". When the night temperature is around 10 °C, it is not necessary to close the shed. In the high temperature climate of Jinfeng, it is forbidden to shed the shed due to the fear that the shed film will be removed by the wind. The seedlings will be burnt at high temperature, and yellow leaves will appear, which will affect the light cooperation and become weak seedlings.
Ventilation in greenhouses is to reduce the temperature inside the shed and promote the growth of seedlings, so you must pay attention to the ventilation method, otherwise it will be counterproductive.
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