Winter crops cold and antifreeze technical measures(二）

Third, tea cold protection and disaster reduction technical measures

Young and mature tea gardens.

1. Perform classification and trimming. For young tea trees without picking noodles, different pruning methods should be adopted according to the degree of freezing. If it is frozen and light, it can be cut without natural germination. If it is heavier and heavier, use the pruning shears to re-prun the frozen branches in place. If the freezing is serious, use the method of squatting. The fully frozen branches, for the branches that are not completely frozen, only cut the frozen parts, in order to facilitate the tea tree to resume growth faster. For the aged tea trees that have been picked, different pruning methods should be adopted according to the degree of freezing. For the frozen and light, pruning on the surface of the bonnet, you must master the "Ning Shallow Do not Deep" when trimming, to avoid cutting off some of the bud heads that can still germinate; for heavier frozen, re-trimming at the appropriate position; If the freezing is very serious, it can be carried out in Taiwan.

2. Perform classification management. The tea seedlings that had just been transplanted in the autumn, because the root system has not fully recovered, it is easy to be arched by the whole frozen soil, causing a gap between the root system and the soil, resulting in the death of the whole plant. After the soil is thawed, it is necessary to step on the soil in the roots of the seedlings in time, so that the roots are in close contact with the soil, and cover the soil or hay, and sprinkle some dirt on it to avoid damage again. For young and mature tea gardens, shallow ploughing and weeding should be carried out after rejuvenation, and some quick-acting nitrogen fertilizers (such as urea) and phosphorus and potassium fertilizers should be combined, especially for young tea trees. The application of phosphorus fertilizer can contribute to the growth of roots. In this way, it can not only replenish nutrients in time, but also play a role in germination and fertilizer, which has a good effect on restoring vitality and enhancing sprout growth.

Breeding seedlings.

1. Timely snow removal shelter. As long as the weather gets warmer, all localities must organize the labor force to clear the snow on the shed and the field in time; immediately restore the collapsed arch shed to minimize the pressure on the snow shed of the seedlings.

2. Drainage and drainage in time. In the process of melting snow and ice, it is necessary to timely clear the trench, the furrow and the main ditch, so as to make the ditch and the ditch communicate, and minimize the residence time of the snow water in the seedbed.

3. Do a good job of fumigation. When the snow turns fine, there is usually a strong frost, which is extremely harmful to the seedlings. All localities should be covered with plastic or straw frost-proof on the arch shed, and at the same time, 3-5 piles of weeds per acre can be used to smoke and reduce the freezing damage.

4. Prevent disease in time. After the tea seedlings are frozen, they are often susceptible to disease and infestation. After the sunny days have been melted, it is necessary to spray a Bordeaux mixture or carbendazim to control the disease.

Fourth, rapeseed cold disaster reduction technical measures

1. Clean up the "three ditch". After the snow and ice, the "three ditch" will be dredged in time to drain the water in the field, improve the soil permeability, reduce the double impact of freezing damage and waterlogging on rapeseed, and promote the restorative growth of roots.

2. Clear frozen leaves of frozen moss in time. The early moss, leaves and yellowish-white dead leaves that have been damaged by freezing will be removed and brought out of the field in time after the weather turns fine to promote the growth of the base parts and make up for the loss of freezing damage.

3. Follow the quick-acting fertilizer. After rapeseed is damaged by frost damage, the leaves and roots will be damaged to varying degrees. According to the seedlings, the topdressing will be appropriate, and the nutrients will be added to promote the growth as soon as possible. The 3-5 kg of urea or 10 kg of compound fertilizer should be applied per acre, and 100 grams of combined fertilizer should be applied. Potassium dihydrogen phosphate is sprayed with 50 kg of water, and the field with poor growth can be appropriately increased.

4. Prevent disease in time. After the rapeseed is frozen, the plant is damaged, and it is prone to diseases such as sclerotinia. It should be sprayed with sclerotia or prochloraz in time for prevention and treatment.

Protective measures for breeding greenhouses

1. Remove snow in time;

2. Reinforcement in the greenhouse;

3. Close the two shed doors;

4. Take warming measures in the shed.

Zhengzhou Delong Chemical CO., Ltd. is the production base of plant growth regulators in China, which established in 2009, specializing in offering plant protection products. If you have any question, contact us any time.