Causes and Countermeasures of Early Freezing Damage in Spring Tea Production

Since 2004, our county has been affected by the cold air in the north many times in a row. Especially in late January and early March, the minimum temperatures reached minus 7 degrees and zero degrees respectively, causing serious freezing damage to the growth of tea plants. According to preliminary investigations, in the early 2004 tea production process in our county, the frozen area was about 2,680 mu. The occurrence of this frost damage caused local cold damage among the varieties in the tea production of our county, which had a certain impact on the production of spring tea in our county, especially the production of exceptionally high quality tea. From the perspective of the area where the damage occurred, the towns of Shilian, Miaogao, Hushan and Yunfeng were more serious, and the cold injury mainly occurred in low-lying areas of Datian and mountainous regions, especially in recent years. Judging from the frozen varieties, the main species is Wu Niu Zao, followed by Suichang Yin Monkey Tea and Ying Shuang. Judging from the degree of freezing, the severe winter frost injury was early Ukrainian cattle breeds. The degree of frost damage was grade 3, and most of the dry coke was damaged; followed by Suichang silver monkey tea, the green leaf layer was partially anxious, and some of the newly sprouted leaves were frozen. The degree is grade 3; once again for the frost-resistant varieties, the green leaf layer is slightly anxious, and the degree of freezing damage of the new sprout leaf is 2 levels. First, the cause of frost damage From July 2003 to January 2004, the drought anomaly persisted. In the past seven months, the accumulated precipitation was only 342.7 mm, which was 260.3 mm less rain than the average of 603 mm, a decrease of 4.32 percent over the normal years. Since 2004, it has been affected by the cold air in the north many times. In the end of January, the absolute temperature dropped to minus 7.1 degrees. On March 4, the temperature dropped to minus 1 degree, and frost continued for many days. Under conditions of rapid and rapid temperature drop and arid and low temperature climate, especially in the tea gardens of low-lying areas in Daejeon and mountainous regions, moisture forms ice crystals between the tea cell tissues, causing cell membrane damage, accumulation of components such as anthocyanins, and impeding the normal growth of cells. The tea tree caused more serious damage, which was characterized by shoot scorching and burning, and thus formed a clear dry phenomenon. Second, the countermeasures 1, moderate pruning: First of all, damage to the green leaf layer, picking surface buds more serious tea garden phenomenon should be moderately light pruning to stimulate bud germination. Secondly, for the tea gardens where the peeling of the xylem and phloem base of the tea tree stem base (commonly known as peeling) phenomenon should be dealt with according to the situation: (1) For the tea gardens where the xylem and phloem of the base of the tea tree are completely peeled off or most of them are peeled off, the tea plantation shall be promptly carried on; (2) For the tea plantations where the xylem and phloem of the base of the tea tree have not yet been separated, but the tea plantation with a relatively obvious cracked wound should be sprayed with fungicides in time, such as carbendazim and thiophanate, to prevent wound infection and affect the normal growth of tea plants. 2. Strengthen tea garden management: (1) Pick frozen frozen shoots in time to promote the germination of adventitious buds in the next stage. (2) Increase foliar fertilizer, increase the germination speed and density of buds, and increase tea yield. Can choose to concentrate chelated tracery amino acid 1000 times, tea quick-acting germicide 1000 times, "Dr. Lu" 1 300-fold or urea 1% + 0.5% dipotassium phosphate. (3) Increase organic fertilizer. In early May, 100 kg/mu of organic fertilizer was added to enhance the resilience of tea plants.

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