Remedial measures for Frost injury of Tea trees
From February 15 to 18, we investigated the freezing injury of tea trees in Zixingtang City, Pengshi City, Guocha Institute and Chenzhou Huatang Tea Farm. The investigation found that in the well-cultivated tea garden, the green leaves of the tea trees are thick, the trees are strong, and the degree of disaster is mild, and vice versa. The disaster degree of different varieties was also different, among which the early varieties Fuyun 6 and Fuding Dahao and Bai Maozao were seriously affected, while the middle and late varieties Bixiangzao, Qianye Qi, hairy crab and population varieties were less affected. On the whole, all the tea trees in the survey sites suffered frost injury, of which the seriously affected area accounted for about 50%. From this, it can be inferred that the output of famous and high-quality tea will be reduced by 50% to 60% this year, and the economic loss of the tea farm will reach more than 40%. At present, the remedial measures that should be taken in the tea garden are as follows:
The flat tea trees are trimmed lightly as soon as possible, and the mountain tea trees will be pruned after the temperature is stable. The degree of pruning depends on the degree of freezing of the tea trees. Try to cut off the frozen leaves and branches, but do not cut too much, otherwise the mining will be further delayed and the yield will be affected.
After pruning, apply quick-acting topdressing as soon as possible, apply 20 to 25 kilograms of urea per mu, and spray 0.2% urea foliar fertilizer as soon as possible to promote the tea tree to recover its vitality.
For low-lying areas, clear ditches and drainage as soon as possible to facilitate ventilation, increase soil temperature, prevent stagnant water and promote root growth.
For frozen tea, frozen bud leaves should be strictly separated from normal bud leaves in order to prevent the overall quality of tea from being reduced.
For frozen bud leaves, due to low water content, bud leaves are relatively dry, it is suggested that the green should be slightly lighter, knead a little heavier, remove the withered tip.
In order to avoid the same type of disasters in the future, it is suggested that various localities should take the following measures in the construction and management of tea gardens: first, select improved varieties with good frost resistance, such as Ye Qi, Bixiang, etc., and match early, middle and late varieties. The second is to strengthen the management of tea garden, apply more fertilizer and enhance the tree potential. Third, the annual application of base fertilizer is arranged in October after closing the garden as far as possible, so as to promote the growth of tea root system and the accumulation of tea nutrition. Fourth, the tea garden is covered with straw, which not only increases fertility, but also loosens the soil, preserves water and fertilizer, and resists cold and frost.
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Strengthening Fertilizer and Water Management to prevent premature senescence of Cotton
Recently, there is a trend of premature senescence in some cotton fields, so measures must be taken as soon as possible to ensure high cotton yield. It mainly shows that the red stem to the top of the cotton plant, the stem is hard and inelastic, the growth point of the main stem is prominent, it is difficult to extend the new fruit branches and nodes, the leaves fade, the new leaves are small, the leaves of the middle and lower parts of the cotton plant appear reddish brown spots, and the basal leaves wither; the leaf margin scorched and fell off prematurely. The cause of premature senility (1) the weather is unfavorable. This year, cotton suffered a severe drought in the early stage of growth and waterlogging in the middle stage, resulting in poor root growth and fertilizer absorption.
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Key points of production recovery Technology of Tea trees after Snow disaster and Frost injury
This year, some tea areas across the country experienced severe weather such as heavy snow and low temperature freezing, which caused different degrees of snow disaster and freezing damage, such as broken branches, discolored leaves, withered branches and so on. In order to resume tea production and reduce the economic loss of tea farmers as soon as possible, in view of the occurrence of disasters, the following technical points are put forward. 1. Pruning 1. Mild frost injury (only leaves are damaged): no pruning or light pruning as appropriate. 2. Moderate freezing injury (damage to production branches) and severe freezing injury (damage to backbone branches): pruning when the boundary between the frozen dead part and the healthy part is clear.
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