[Tang Dynasty said that this is not over.]

The warm and humid climate also favors water resources in the middle and lower reaches of the Yellow River, which also makes agricultural irrigation and fishery resources quite abundant.

The shortening of the cold period lengthened the time suitable for the growth of crops, which does not even require specific documents, which can be found in the literature of the Tang and Song dynasties.

The harvest time was April in the Tang Dynasty and May in the Song Dynasty.

The earliest record of the two-cropping system in ancient times was also found in the Tang Dynasty, and although this fairly advanced agricultural technology may not have been fully developed, it was still able to increase the output of grain significantly.

To sum it up, the temperature changes by only two degrees Celsius are overwhelming.

It enabled the Tang Dynasty to have the largest arable land area and a pleasant climate of all dynasties, and as a result, it obtained abundant grain production and natural resources, and finally created a magnificent Tang Dynasty with a degree of prosperity that shines in the annals of history.

But it is also because of this that the Tang Dynasty's waste of natural resources may also be the highest in all dynasties. 】

At this moment, Liu Bei was really in a daze.

He looked out the window.

This general's mansion is a relatively well-preserved mansion in the old Chang'an, and after a simple repair, you can still get a glimpse of the grand scenery of the past, such as two glass windows with good lighting and ventilation.

And at this moment, through this window, Liu Bei can clearly see that the leaves of the tree in the courtyard outside are not very big at this time, and it has not been long since the leaves are obviously withdrawn.

It's the end of April, but you can still feel the chill of winter when you go out.

But at the same time, in the Tang Dynasty, the wheat was harvested......

At this moment, Liu Bei suddenly was not surprised or envious of the abundant martial arts of the Tang Dynasty, he only wanted this favorable climate.

After Kong Ming transcribed it just now, he briefly told him the simple meaning of the climate change map, and Liu Bei also saw it really:

What they will face in the next 100 years is an irreversible cooling climate, and the environment in the north will only get worse and worse.

Kong Ming whispered that in the future, he would try to develop the south in advance, and at the same time, he would also build a strong army and a strong city in the Yellow River generation to deter the Hu people and eliminate their bad intentions.

In this environment, Liu Bei sincerely envied such a climate.

Can rice be grown north of the Yellow River? Liu Bei said that he couldn't even think about it.

However, at this time, Kong Ming didn't care about saying anything, because he was busy copying the relevant words of the "Barbarian Book".

Pang Tong and Fa Zheng next to him also breathed a sigh of relief, at least now they are not strangers to agriculture.

"This method of cultivating rice and wheat with double cropping, the later generations called it advanced, so it seems that this method will also be used by future generations?"

Pang Tong is now quite sensitive to these words commonly used in later generations, and attaches great importance to this agricultural method with just two words.

Fa Zheng has been stationed in Hanzhong for a long time, and now he has become a lot darker, but he is also more comfortable with agriculture:

"Later generations can concisely summarize the double cropping system, which shows that this double cropping method is by no means limited to rice and wheat."

"And it can be weighed, it can be seen that it is widely used, and the climate in later generations is not as warm as this Tang Dynasty, even if it can grow rice, it must be quite laborious."

"Or you can set the field to try it to see if the wheat, beans and other things can be double-ripened."

Kong Ming nodded slowly and said:

"Then there will be filial piety."

The prospect of these two methods of ripening is to be seen at a glance, but they do not have the miraculous doctrine of later generations, and it is difficult to understand the subtleties of various crops.

Therefore, if you want to double crop rice and wheat, you can only try it slowly with the clumsiest method.

Since Fa Zheng can see it so clearly, then it just happens to be sent out.

Fa Zheng also has no opinion, to be honest, leaving Hanzhong to assist Xuande Gongxing and restoring the customs is exactly what Fa Zheng has in mind.

After all, he was born in Youfufeng, and he is an authentic Sanqin person, so how can he be tired of returning to his hometown in such fine clothes?

After simply assigning the matter, Kong Ming felt that he could probably imagine what was going on.

Such a favorable climate must have also made it easier for plants and trees to grow, and in the early Tang Dynasty, after the troubled times, the people were sparsely populated.

Under such circumstances, it was estimated that Tang officials would not be able to pay attention to the cutting down of trees.

And with the change of climate, the consequences of such carelessness quickly caused a backlash to the Tang Dynasty.

The predecessors cut down the trees and the descendants suffered, Kong Ming thought so.

And it seems that the Tang Dynasty doesn't need to wait until the next generation, the current dynasty has already responded to the disaster.

……

After a short break in the controversy in the conservatory in Bianjing, Zhao Guangyi kneaded his shoulders and sat down carefully, Zhao Kuangyin's face was still angry, but because it was too dark, no one could see it.

And listening to the simple narration of the light curtain, Zhao Kuangyin also envied from the bottom of his heart.

Now he knows the difference between the Song Dynasty and the Tang Dynasty in farming.

It's just that I didn't expect that there could be such a complicated thing behind the simple "it's getting cold".

Therefore, it is inevitable to be like Liu Bei, and imagine in my heart that if I can be like this Tang......

Then he saw that Zhao Pu's face was more bitter than him - Zhao Pu's face was quite white, and he could see his expression clearly.

"Although this climate is not as good as Tang, it is ......"

Before Zhao Kuangyin finished speaking, Zhao Pu shook his head and spit out two words in an astringent voice:

"Yellow River."

So Zhao Kuangyin instantly woke up.

Just now, he only cared about the prosperity of the Tang Dynasty, and almost forgot the big trouble left over from the Tang Dynasty: the Yellow River.

The light curtain was simple, but at this time, in retrospect, his whole spine was cold: treating the symptoms but not the root cause.

The meaning of this is very simple and straightforward, but the subsequent meaning is probably that the entire Song Dynasty will fight with the Yellow River.

Oh no, the Southern Song Dynasty seems to have lost the Yellow River......

Zhao Kuangyin's already dark face is even darker at the moment, the reason is very simple:

Bianjing City is on the edge of the Yellow River.

How to face the Yellow River is probably an unprecedented problem.

……

And Li Shimin is pure and unacceptable, after all, he had unabashedly ridiculed this weak Song Dynasty before, thinking that it was not suitable to succeed the Tang Dynasty.

As a result, it now seems that the reason for the weakness of the Song Dynasty is still the pot of the Tang Dynasty?

This is absolutely unacceptable to Li Shimin.

"From tomorrow, I will go to investigate the coal mines in Datang!"

What later generations said may have been sensational, but with the map of climate change as a supplement, he also understood:

This climate lasted for a maximum of two hundred years, and the subsequent colder climate did not change by the will of the Son of Heaven or the Khan of Heaven.

Now that the history of the Tang Dynasty has slowly changed, the Tang Dynasty may be able to reign for another hundred years, or it may also perish early due to some accidents.

But in short, they have to think about their children and grandchildren.

After all, even if the dynasty changes and the Son of Heaven shifts, it is still the people of China who thrive in this land.

(End of chapter)