Remedial measures after Frost in growing Litchi

1. Pruning

If the leaves die, the top branches turn brown and necrotic, but the lower branches and leaves do not freeze to death, the damaged branches and leaves should be removed in time to avoid the spread of freezing damage and increase the burden on the plant. Proper pruning can also stimulate vegetative growth, but only cut dry leaves to retain branches if the leaves are dry and the branches are not frozen. If the bark is not cracked after the branch is damaged, it should be wrapped in straw or plastic film immediately. If the young tree has frozen to death above the trunk, the frozen part should be sawed off, and then immediately wrap the remaining branches with straw or plastic film to avoid bark cracking and necrosis.

2. Fertilization

Topdressing fertilizer in time and applying about 1 ton of urine per mu is beneficial to root growth and plant recovery. It is also necessary to increase the application of strong flower fertilizer during the period of flower bud differentiation. Spraying foliar fertilizer, rapidly spraying foliar fertilizers such as Shengduo, plant power 2003, potassium dihydrogen phosphate, green Fenwei, Aiduoshou, compound nucleotides, etc., every 10 to 15 days, in order to increase nutrition, promote root growth and promote flower formation.

3. Drainage and irrigation water

After the occurrence of frost injury, attention should be paid to drainage and irrigation to promote root growth. If the soil is dry, it should be irrigated in time to speed up the recovery of plant growth. If the young trees have all frozen to death above the trunk, they should also be covered with heat preservation and moisture, so as to urge them to reproduce new buds and cultivate new crowns at the top of the tree. It is necessary to loosen the soil in time after rain to promote soil ventilation and keep the soil layer loose so as to facilitate the extension and growth of the root system.