Performance symptoms
Seedlings that have emerged and have been removed from the film: After the seedlings have emerged, in order to synchronize them with the growing environment as quickly as possible, there is a process of hardening seedlings. That is, when the seedlings in the shed grow to the 1.5th leaf, they start unmasking the seedlings. The two cultivars are exposed first, and then fully exposed after 2-3 days, so that the seedlings grow in the natural environment. At this time, it was cold and cold. Since the seedlings were young, the autotrophic system was not yet fully established, and the growth environment deteriorated due to the low temperature. Therefore, the yellow leaves of the seedlings grew slowly and even stagnated. The low temperatures also caused cold damage and even frost damage, making young The tissues of the leaves were destroyed, and they showed water loss. The leaves turned yellow until they turned white and the leaves died.
Seedlings that have emerged but have not been removed from the film: The seedlings have emerged, but the seedlings that have not yet been filmed have been weak. The cold temperature caused the external environment to be low, but since the film was not removed, the temperature inside the arch was reduced, but it was higher than the outside and had a delayed effect on the growth of seedlings, but not so much.
Has not sown seedlings: After sowing cover film, seedling bed, after encountering the cold temperature makes the environment lower, while the temperature within the shed will be properly reduced, a direct impact on seed germination, resulting in slow emergence, germination rate is low, The germination is low and the emergence is not neat.
Unseeded areas: Cold temperatures make the temperature lower. If it can not be raised to more than 10°C, it will affect the sowing, which will lead to a delay in sowing. In particular, the delayed planting period will exacerbate the contradiction in the two quarterly fields. Prevention measures
Careful management of stocks. For the seedbeds that can continue to cover the membranes, it is possible to choose to cover the membrane at a slightly higher temperature at noon. Can not continue to cover the temperature of the seedbed, should seize the timing of the temperature began to rise, a reasonable top dressing, promote long strong seedlings, carefully managed stocking seedlings. For dry nursery seedlings, the leaf age is about 3 leaves, and 2 kg of farmyard manure can be applied to 15 kilograms of water, followed by urea 2 for topdressing. For wet nursery fields, because the seedlings are now weak, some grow seedlings and do not rush to water.
Grab the sunny days to dry the field. In the morning, the water is put in the field to promote the growth of weak seedlings. Can also be taken in the morning to put water to dry fields, the method of shallow water irrigation in the evening to promote the growth of seedlings. At the same time, in line with the principle of dual roles of sterilization and physiological regulation, it is recommended to use 10ml of Zhongwei “30% Ethic acid†and 8ml of plant dragon “11.6% amine ester†to evenly spray 15kg of water to achieve seedling preservation. Promote growth, and pay attention to the prevention of aphids, aphids, rice and other horse pests.
Strengthen the management of seedbed membranes. For unseeded seedlings, do not hurry to remove the seedlings even if the seedlings emerge. When the temperature rose steadily to around 13 degrees, the weather began to open at nearly noon and the two were opened. Before 4 o'clock in the afternoon, the film was gradually covered, and gradually the seedlings were slowly adjusted to the environment to avoid cold damage.
Reasonably determine replanting. For the emergence status, it is reasonable to determine whether to replant or not. Due to the low temperature during the cold period, the germination rate and emergence will be affected. Therefore, in particular, seedlings that have just started to emerge, some seeds may continue to sprout. Therefore, for the seedlings that are currently out of seedlings, replanting can be suspended. After the temperature rises, the seedling status will be investigated.
Delay sowing countermeasures. Cold weather, if it continues, will directly affect sowing, resulting in delays in sowing. Late sowing seedbeds, adhere to a reasonable dense planting, it is best not to increase the amount of seeding to improve seedling quality. Pay close attention to the weather conditions. Once the temperature rises steadily, it is expected that when the weather improves in the next day, it will be soaked in time. The next day, it will be coated with a “dry nurse†to catch the sunshine in time. Select the seeding cover between 10:00 am and 3:00 pm Membrane, raise seedbed temperature, ensure high seedling rate.
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