What should I do if the temperature suddenly becomes very low after rice seeds germinate?

After rice seeds fall into the mud, the temperature is low or plummets, so irrigation can be used to prevent it, because the temperature of water is above 0 degrees Celsius, which has a certain heat preservation effect after irrigation. Paddy fields are completely submerged, and early rice can absorb water without irrigation in a small arch shed, which is divided into three stages. The first stage is the physical expansion process of rapid water absorption. At this stage, more than half of the water needed for seed germination is absorbed; The second stage is the biological process of slow water absorption, and the seeds are in the intense activity of enzymes.

Double film in greenhouse. This technology is rarely used, after all, there are certain requirements for the greenhouse skeleton, which will increase the planting cost and make the operation and management more difficult. At present, this technology is mainly applied to the super-early seedling raising project in Heilongjiang reclamation area. If the seedlings are planted upside down and encounter freezing injury in cold and low temperature weather, about 3.5 grams of 0.04% brassinolide can be used per mu. Spray 35 kilograms of water evenly on the seedlings. Brassinolide is a biological activator. Before sowing, the germination rate and germination potential of seeds should be measured and tested to know whether the stored rice seeds are suitable for planting. Low or weak germination rate will lead to uneven emergence or low seedling rate.

Raising seedlings in greenhouse is the best way to raise and protect early rice seedlings. Because early rice seedlings germinate early and the temperature is low, the temperature can be adjusted manually by raising seedlings in greenhouse. This is the safest way. At present, bulb heating and raising ground temperature are relatively reliable methods. Choose a light bulb with a high degree, and then put one about 3 meters away from plastic and germinated seeds and let it hang in the air. This can raise the temperature without harming the seedlings.

Cold injury is a prominent problem often encountered in northern rice areas. Cotton rot and seedling rot often occur in hydroponic seedlings and direct seeding fields; Wet seedling raising and dry seedling raising often occur damping-off and bacterial wilt, and often a large number of seedlings die. Especially for rice seeds with long seedlings and poor root development, their water absorption is closely related to temperature. In the temperature range below 30℃, the higher the temperature, the faster the water absorption. Thin chaff absorbs water quickly, while thick chaff absorbs water slowly. In addition, hybrid rice seeds absorb water quickly.