Actively take measures to prevent tea tree frost damage

Frost damage is the main weather disaster suffered by tea trees. After the tea tree is chilled, it will affect the yield and quality of the tea, and it will cause severe defoliation and even the death of the whole plant. Freezing damage of tea tree can be divided into wintering period freezing injury and freezing period freezing injury according to the growing season of tea plant. The latter has the greatest influence on the yield and quality of spring tea in that year.

Winter frost damage prevention

During the growing season, the management of fertilizers and fertilizers should be strengthened. Attention should be paid to the prevention of diseases and pests, and the combination of mining and raising should be adopted to promote the robust growth of tea trees in order to accumulate more organic substances and increase the resistance to low temperatures. In the autumn and winter, base fertilizers, especially organic fertilizers, should be re-used to increase the temperature of the ground.

In the tea break period, pick the raw soil on the barren hills in the tea garden, and level the tea tree roots to promote the tea tree rooting down. This is conducive to maintaining water and heat preservation, both to promote the growth of tea, but also enhance the ability to resist cold.

The period of leaf remnants in high mountain tea gardens is closely related to the freezing injury of tea trees. Autumn leaves remain in the late autumn leaves, and the leaves are soft and prone to frost damage during the winter. The period of leaving the leaves should be at the end of the spring tea or the beginning of the summer tea. At this time, the leaves have matured during the winter and have a strong ability to resist low temperatures, which will help the tea trees survive the winter.

Tea plants in the tea gardens can provide drought and freeze protection. The low temperature in winter in tea plantation tea garden can be increased by 1~2°C than that in non-straw tea garden, which can reduce the degree and depth of frozen soil and keep the soil moisture.

In the autumn, interplanting winter green manures between the tea gardens covers the ground, which can increase the soil temperature and reduce the freezing damage. In the spring, these green manures can be used as fertilizers. Suitable for interplanting green manure peas, wolfberry fruit, wolfberry and so on.

The establishment of shelterbelts in tea gardens can reduce wind speed in the region, regulate temperature and reduce evaporation, and can significantly improve the microclimate of tea gardens. The alpine tea plantation is planting protective forest belts in the windward mouth, which can effectively withstand cold wave attacks.

Late frost prevention

Late frost has a great influence on the production of famous teas, and it is very important to actively prevent late frost. In addition to the precautionary measures against freezing damage during wintering, the following measures can also be taken to prevent the frost:

Smoke fumes. The role of smoke smoke is to form smoke in the air of the tea garden, prevent the spread of heat radiation, and use the "greenhouse effect" to prevent late frost, the effect is obvious. The method was to set the heap according to the wind direction, topography, and area before the frost came that night. The temperature dropped to around 2°C to ignite, preventing both the late frost and the accumulation of fat.

Spray the cream. A tea garden with water and sprinkler equipment can use these devices to spray water when the night frost is harmful, and to wash off the frost that covers the buds of tea trees.

Cover frost protection. Before the onset of low-temperature cold weather, cover the surface with rice straw, weeds, and shade nets to protect the tea tree and protect it from frost.

Foreign tea gardens to prevent late frost methods include air supply method (fan installed in the field), spray water freezing method (maintaining shoot temperature around 0°C), and heating method (increasing the temperature of tea tree tops).

Frost damage remedies

Trimming. For tea trees that are severely chilled (frozen leaves and freeze-dried), the frozen leaves should be immediately trimmed to prevent germination of frozen shoots after the temperature has warmed. Pruning heights will be able to remove the frozen dead leaves and freeze them slightly. Pruning too heavy will further delay the growth and germination of spring shoots, delay mining time, and affect yield. If the lightness is too light, the effect is not good. However, tea gardens with no frost damage on the canopy surface may not be pruned before spring tea, and the light pruning period may be changed to mid-May after spring tea. In this way, the spring tea can be germinated earlier and the famous tea can be harvested early and early.

Shallow fertilization. Freezing damage to the tea tree is a certain degree of injury, and shallow ploughing and fertilization should be carried out as soon as possible. After wintering damage occurs, it is necessary to re-apply the spring bud germination fertilizer, and the amount of fertilizer should be increased by about 20% compared with the original, and at the same time, a certain amount of phosphorus and potassium fertilizer should be applied. After the freezing injury of the tea tree, the foliar fertilizer was sprayed on the buds of the spring buds to promote the growth of the tea tree, the buds and the growth of the shoots.

Cultivate the crown. Tea trees that have been lightly cultivated after being frozen have one large leaf for spring tea picking, and conventional ones for summer and autumn tea. This will not only help to maintain the canopy, but also use some high-grade tea to reduce the damage caused by freezing. loss. The frozen tea trees that have been heavily pruned or smashed in Taiwan should be based on cultivation. The specific requirements are based on the heavy pruning and the cultivation and management of Taiwan Tea Garden.

Qinggou drainage. For poorly drained tea garden plots where waterlogging has occurred, catch the clear sunny ditch drain as soon as possible to reduce the groundwater level to below the tillage layer.

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