According to the measurement, in the winter of 2010~2011, the depth of frozen soil in Tianjin was the deepest in the past 7 years. As of March 8, there are still 14cm frozen soil layers. It is expected that the frozen soil layer in Tianjin will be circulated after March 20, and the time of Huatong will be about 5 days later than normal. In view of the fact that there are still frozen soil layers in the wheat field, it is not advisable to prematurely water the green water to avoid frostbite. It is suggested that after the frozen soil layer is passed on March 20, the water will be replenished and the roots and tillers of wheat will be promoted.
It is estimated that the average temperature in Tianjin in mid-March is close to normal (the 5.4 °C in the same period of Xiqing history), and the snowfall is less. Affected by cold air, there were two cold air processes in the city in mid-March, which occurred in the early and late phases. Among them, the temperature rose rapidly on March 10~12, and there was a strong cold air affecting Tianjin in 13~14. At that time, there may be sporadic sleet and the temperature dropped significantly.
In view of the fact that there are still frozen soil layers in the farmland, it is not advisable to prematurely water the green water to avoid frostbite. Farmers are advised to pay close attention to the weather forecast. According to the weather changes, after March 20, the water will be replenished to promote the spring roots and tillers.
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