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Ministers, since, the autumn of the first year of Zhenguan. Since the minister entered Shangshu Province, he has learned about the agricultural situation as follows:

1. In July of the first year of Zhenguan, the Kanto Henan Longyou and the border states (about equivalent to most of the Loess Plateau and the southern part of the North China Plain) were frosted and damaged the autumn crops.

2. In August of the first year of Zhenguan, the frost in the border states along the border of Kandong and Longyou, Henan Province damaged the autumn crops.

3. In August of the first year of Zhenguan, Henan Longyou Prefecture frost.

4. In the autumn of the first year of Zhenguan, frost kills crops.

5. In the first year of Zhenguan, Guanzhong was hungry, and a horse of silk only got a bucket of rice. The people eat after each other.

Minister, I'm afraid, after the great drought, there will be floods.

It is imperative to build water conservancy.

Taking Dujiangyan as an example, make full use of natural resources, turn harm into benefit, make people, land and water highly harmonious and unified, irrigate the Chengdu Plain into the country of abundance, the granary of the southwest, and still nourish the ten thousand hectares of fertile land in the country of abundance.

Please make your judgment clear. ”

In the first year of Zhenguan, Guanzhong was hungry, and in the second year, there were locusts in the world; Three years, big water.

The above statements are recorded in books such as "Shufu Yuangui", "Old Tang Book", "New Tang Book", "Zhenguan Political Dignitaries", "Zizhi Tongjian" and other books.

In the first year of Zhenguan, in the area of the Mongolian Plateau (East. Turkic Khanate) and the Yellow River Valley (Tang Dynasty) and other regions experienced a cooling period that lasted for about 3 years.

From the first year of Zhenguan to the third year of Zhenguan, Dong. The Turkic Khanate suffered from severe snowstorms and frosts in succession, causing an unprecedented famine. Uncultivated. Originally powerful East. The Turkic Khanate suddenly collapsed in the fourth year of Zhenguan, and Fang Xu believed that it had a lot to do with the colder climate and a large number of livestock freezing to death and starvation.

From the first year of Zhenguan to the third year of Zhenguan, the Yellow River basin suffered from continuous severe frosts, resulting in severe famine.

In the first year of Zhenguan, the climate of the Yellow River basin suddenly became colder, and it suffered severe frost for three consecutive years. The record of this frost disaster is endless.

The continuous frost disaster was the heaviest in the first year of Zhenguan, and the frost disaster in the autumn of that year was the most extensive, covering almost the entire Loess Plateau and the North China Plain, and causing a large-scale famine.

There are not many accounts of the frost disaster in the second year of Zhenguan, which occurred in the Hebei region of Henan and caused a famine.

The frost disaster in Zhenguan for three years occurred in the northern part of the Loess Plateau, and the impact was relatively light.

In the Guanzhong area, the two-year famine has tended to ease: "In the third year of Zhenguan, Guanzhong was ripe, and no one fled home. It has won the hearts of the people. ”

According to the analysis of historical data, the frost disaster in the Yellow River Basin seems to have a tendency to weaken year by year.

Zhenguan four years: "It's the age of the year, the world is big, the diaspora has returned to the hometown, the rice bucket is only three or four dollars, and there are only twenty-nine people who have been sentenced to death at the end of the year." As for the sea in the east, and the five mountains in the south, all of them are not closed to foreign households, and they do not get food for travel, and they are taken from the roads. “

"Frequently to Feng Nim (three years after Zhenguan), rice bucket three or four money, travel from Beijing to Lingbiao, from Shandong to Canghai, all do not give grain, take to the road. When entering Shandong villages, travelers passing by will be generously treated, or there will be a gift when they are sent. This is all unprecedented. “。

In the sixth year of Zhenguan, due to "the peace of the Turks, the valley of the year has been repeatedly climbed, and the ministers said that they would like to seal Mount Tai". The Tang Dynasty was already a scene of "Zhenguan rule".