Li Shimin soon sent a bunch of files, all of which were related to Xiao Miao, and it seems that Li Shimin usually does intelligence analysis work.

At this time, the social productivity was relatively low, and only the government could use paper as a carrier of records on such a large scale.

Although the Tang Dynasty was the most powerful dynasty in Chinese history, with the closest ethnic relations and the most frequent foreign exchanges, Li Bo also had to say that the Sui Dynasty was more economically powerful than the Tang Dynasty.

This is also related to the war at the end of the Sui Dynasty and the beginning of the Tang Dynasty, when Emperor Wen of Sui Emperor Yang Jian first ascended the throne, the country's population was 4 million, and when Emperor Yang Guang of Sui ascended the throne, it had reached 8.9 million households, assuming that a family of six people was calculated, the population of the country during the period of Emperor Yang of Sui was not less than 50 million.

After the great turmoil at the end of the Sui Dynasty and the beginning of the Tang Dynasty, until the death of Li Shimin, Taizong of the Tang Dynasty, Tang Gaozong succeeded to the throne, and the statistical household registration was only 3.8 million.

It was not until the time of Tang Xuanzong that the number of households in the country reached 7.6 million, and there were more than 40 million people in one household of six.

This is still due to the fact that Tang Gaozu Li Yuan has set an example for the people of the whole country.

Before Li Yuan became emperor, he gave birth to five sons, namely Li Jiancheng, the hidden prince, Li Shimin, Taizong, Li Xuanba, the king of Weihuai, Li Yuanji, the king of the nest, and Li Zhiyun, the king of Chu Mourning, and six daughters, a total of eleven children.

However, after ascending the throne, he saw that the total population of the country had been greatly reduced due to the war, so he shouted out: For the prosperity and development of the Tang Dynasty, the people of the whole country were required to resolutely implement the principles and policies of having more children and planting fewer trees if they wanted to make a fortune and become rich.

Li Yuan also showed the people of the whole country the correct way to operate, he was 53 years old when he ascended the throne, but for the sake of Datang, he resolutely gave birth to 17 sons and 13 daughters!

Because he gave birth to too many children, he even named them arbitrarily, and these 17 sons were basically called Li Yuan.

For example, Li Yuanfang, but he is not the one who Di Fat often asks "Yuanfang, what do you think", this is Li Shimin's younger brother, the same age as his son Li Chengqian, born in 619 AD.

It can be seen that Li Yuan is really well-intentioned, his son is as old as his grandson, and even younger than his grandson.

As we all know, the hidden prince Li Jiancheng later died in the Xuanwumen Change, and Li Shimin really became the eldest brother of the 30 younger brothers and sisters born later.

As the so-called "eldest brother is the father", Li Shimin is really an elder brother and a father in the face of some young siblings, which is simply anxious and stressful.

In addition to the demographic inferiority, the same is true in the fields. Emperor Kaihuang of Sui has reclaimed 19.44 million hectares of land in the ninth year, and Emperor Yang of Sui has reclaimed 55.85 million hectares of land in the middle of the great cause.

In the 14th year of Tang Tianbao, 14.3 million hectares of land have been reclaimed, from the perspective of the number of fields, the Tang Dynasty and the Sui Dynasty are greatly reduced, although there are some leaks related to the report during the Tang Dynasty, but it also reflects that in terms of economic strength, the Sui Dynasty has an advantage.

Even the king of Gaochang State, who later rebelled, said that he had been to the Sui Dynasty and the Tang Dynasty, and he always believed that the comprehensive national strength of the Sui Dynasty was stronger than that of the Tang Dynasty.

Therefore, Li Bo felt that in fact, Datang was really in ruins, so he quickly checked the chip in his mind to see what new technology suitable for that time could be taught to Li Shimin.

This will also be beneficial to Li Tang, who will be in an advantageous position to fight with other separatist forces in the future, and crush them with a continuously rising GDP! After all, science and technology are the primary productive forces, and innovation is the first driving force to lead development!

After some inquiry, Li Bo found that there were really a few things that could teach Li Shimin, playing the role of Edison in the Tang Dynasty.

They are water conservancy irrigation system, curved plow, water drum car.

Li Bo suggested that Li Shimin should pay attention to the development of people's livelihood in addition to actively preparing for war, and that he could continue the Sui Dynasty's policy of developing water conservancy and canal systems, build a water supply system in the Guanzhong area, divert water from the Yellow River to irrigate the land, and expand the area of crop cultivation.

It was also possible to build a canal in the Guanzhong area, which would help the capital supply materials and prosper the economy.

After listening to Li Bo's suggestion, Li Shimin thought so, but also raised objections, because the current Li Tang national strength is limited, that is, there is no money, and because of the Sui Yang Emperor's great water conservancy caused by the boiling of public resentment, if at this moment of the anti-Sui tide, it is easy to repeat the mistakes of the past.

Li Bo confirmed that it was indeed in 624 A.D. that Li Tang developed the water conservancy system.

Li Bo then took a piece of paper and drew a few things that Li Shimin had never seen before.

One of them is the Quyuan plow, but because the Quyuan plough appeared in the late Tang Dynasty in history, Li Bo made some slight changes, deliberately leaving the shortcomings, so that the working people of the Tang Dynasty have room to improve it.

I saw that Li Bo's curved plough changed the previous straight and long wheels to curved wheels and short wheels, and installed a plow disc that could be rotated at the head of the wheel, so that the plow frame became smaller and lighter, easy to turn around and turn, and the operation was flexible, saving manpower and livestock.

It's just that this time Li Bo expected, Li Shimin's surprised appearance did not appear.

This situation reminded Li Bo of a classical novel he had read, called "Dream of Red Mansions", which said that Grandma Liu entered the Grand View Garden, and Jia's mother ordered someone to make a "eggplant" for Grandma Liu to taste.

At that time, Jia's mother asked Sister Feng to feed Grandma Liu with eggplant, and said to Grandma Liu: "You eat eggplants every day, and you also taste our eggplants, are they delicious?" ”

After eating it, Grandma Liu smiled and said: "Don't coax me, how can eggplant be this flavor, if the eggplant is so delicious, then we won't grow anything, just eggplant." ”

Sister Feng smiled at Grandma Liu: "This is really an eggplant, we really don't coax you." ”

This made Grandma Liu surprised: "What? Is this really an eggplant? ”

Grandma Liu was suspicious and took some more food and said: "Although there is a little eggplant fragrance, but it doesn't look like an eggplant, you can tell me how to get it, and I will eat it when I go home." ”

Seeing that Grandma Liu finally asked the key point, Sister Feng smiled and said, "Oh, in fact, this is not difficult." ”

"You take the skin of the eggplant you have picked, as long as you clean the meat, cut it into shredded nails, fry it in chicken fat, and then use the chicken breast meat, and cut the mushrooms, new bamboo shoots, mushrooms, spiced dried curd, and all kinds of dried fruits into nails, simmer them in chicken broth, collect the sesame oil, add the bad oil, and seal them tightly in a magnetic jar. When you want to eat it, take it out and mix it with fried chicken and melon. ”

After listening to it now, Grandma Liu felt that the Daguanyuan was really good, and even ordinary eggplants were so tricky, so she shook her head and stuck out her tongue and said: "My Buddha, this turned out to be made with a dozen chickens to make such an eggplant, and it is strange that this taste is heavenly." ”

Although Li Shimin is a ruler of the country, for a nobleman who has never farmed, Li Shi has no feeling for this Quyuan plow, even if Li Bo adds a rocket thruster to it.

This is also why Jia's mother didn't take out the abalone cucumber wings to entertain Grandma Liu, because even if she made a shark fin for her to eat, she was afraid that it was potato vermicelli, but eggplant, a common food, could make Grandma Liu feel great through its complex method.