Anti-freezing measures of Tea from Flower seedlings

In order to effectively reduce the losses caused by disasters to flower seedlings, recently, provincial flower seedling experts put forward anti-freezing disaster relief technical measures.

I. Heat preservation in shed

Nurturing seedlings, potted flowers and part of the annual sales of flowers, precious flowers and green seedlings, all can enter the shed to do a good job in the shed insulation work, timely cover the shed film, prevent cold air intrusion, and should be timely warming up light. For thermophilic flower seedlings originating in the tropics and subtropics, the temperature should be maintained above 12 ° C, while other flower seedlings should be maintained at about 8 ° C, at least not lower than 5 ° C, and timely supplementary light should be given.

II. Strengthening field management

Cover and keep warm with plastic film or straw and chaff in time; strengthen field management, ditch and drain in time; remove frost on plants in time (shake gently, knock off with soft bamboo shoots, but do not beat branches and leaves), and cultivate soil.

III. Pruning

For the plants with light freezing injury, light pruning should be strictly controlled to clean up the plants, so as to facilitate the germination of buds. For the more serious damage should be deep pruning or heavy pruning. Cut off the frozen parts in time to promote the germination of new shoots; after thawing, carry out early spring shallow ploughing and weeding, combine with topdressing quick-acting nitrogen fertilizer, and properly supplement phosphorus and potassium fertilizer, so as to make the plants quickly recover vitality, improve the cold resistance and lodging resistance of the plants, and promote the germination of buds and the growth of new shoots. If the permafrost layer is deep, 1% urea +0.2% potassium dihydrogen phosphate can be used for root topdressing. Freezing injury to the plant brought a certain degree of trauma, should be timely shallow tillage fertilization.

IV. Covering between rows, fumigating and driving frost

Firewood, straw, turf, leaves, sawdust, manure, rice and wheat husk and straw can be used to cover tea gardens before soil freezing. About 1500~2000 kg of grass should be paved per mu. Straw, weeds and pruned tea tree branches can be used for paving grass. When the temperature drops to about 2℃, pile ignition shall be set according to wind direction, terrain and area, so as to prevent late frost and accumulate fertilizer.

V. Cover frost prevention and strengthen fertilizer management

For young tea trees, before the arrival of low temperature and cold wave, the canopy surface can be covered with sunshade net, etc., or plastic film or straw and weeds can be covered on the sunshade net; or straw can be directly covered on the tea cluster; strengthen fertilizer management and apply sufficient base fertilizer; apply organic fertilizer or nitrogen, phosphorus and potassium fertilizer to improve soil temperature and soil fertility; for tea gardens with light freezing injury degree and original good picking surface, the pruning degree should be shallow rather than deep, and the picking surface should be kept as far as possible. For the more serious damage should be deep pruning or heavy pruning or even mowing.

VI. Shallow tillage, fertilization and cultivation of tree crown

After thawing, early spring shallow tillage shall be carried out in time. If the frozen soil layer is deep, 1% urea can also be used for root topdressing; after the frost injury occurs in the germination period of spring tea, foliar fertilizer shall be sprayed timely while pruning; due to the frostbite of upper leaves of frozen tea trees, the mining time of spring tea may be delayed a little, so spring tea picking shall leave 1 big leaf, summer and autumn tea shall be picked according to routine. This is conducive to raising the crown, but also more high-grade tea, reduce the loss caused by freezing damage.