The characteristics of frost occurrence and comprehensive preventive measures
In recent years, frost has occurred in various degrees in various places, especially in low-lying, flat orchards where tree vigor is weak, and the majority of growers need to do adequate prevention work.
1. Weather characteristics of frost
Generally, the weather is fine during the day and there is a large temperature drop in the evening. The temperature begins to drop sharply from 8-9, reaches 0°C below 12° midnight, and falls below 2-3°C at 2 or 3 in the morning, resulting in different freezing damage. .
2. The cold resistance of different flowers
The order of cold tolerance in floral organs is: flower buds (-2.80--3.58), flowering (-1.60--2.20), young fruit (-1.10--2.20).
3. Comprehensive prevention measures
After many years of experiments in pears and apples in Lijiang, it was proved that the main trunk was applied 20 times to Haizhibao in the early spring. In the red season, 800 times of seaweed liquid is sprayed again, which can significantly increase the nutrients of the tree and reduce the damage of frost. At the same time, it can also promote flower formation and increase the fruit setting rate.
In particular, the orchards, which are prone to frost and frost every year, should pay attention to the weather forecast and incorporate measures. On the afternoon of the same day before the advent, the morning of the next morning, the tree can be sprayed with 400 times-600 times of the sea treasure twice. Frost hazards.
4. Post-frost management
After the occurrence of a frosty film, it is necessary to strengthen management, timely artificial pollination of late silk flowers, increase production as much as possible, and relax management. Otherwise it will cause the rapid decline of tree vigor, rot disease outbreak and the size of the year, it is the end that comes to lose.
YT-H706
YT-H706
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