The grain yield of 14,000 catties per mu is like a fantasy for everyone. In the Tang Dynasty, the yield per mu of farmland did not exceed 500 catties, and the average yield was only 300 catties.

Before the Ming Dynasty, China's contact with the outside world was mostly limited to land routes, and traditional crops were mainly millet, rice, sorghum, and soybeans, and few new species were introduced. Under the agricultural productivity, tools, fertilizers, and grain varieties are relatively backward.

It was not until Zheng He went to the West that the sea lanes became increasingly developed, and the corn, potatoes, and peppers in the Americas brought great changes to China's agriculture.

"General, are you sure it is 10,000 catties per mu?"

"You heard it right, it's tens of thousands of catties!"

In the face of everyone's disbelief, Liu Yu was very proud and slowly explained: "There is a kind of grain called sweet potato, with a yield of up to 14,000 catties per mu; There are also corn, potatoes, improved wheat, hybrid rice... Wait, the output is also thousands of catties! ”

Not only the Tuyuhun generals, but also Wang Hu, Wang Leopard, and Shi were also stunned, whose land yield per mu was 500 catties in the past, and it was all rented and smoky; 14,000 catties, which is not equivalent to 30 acres?

"Boss, what is that~ Can you eat sweet potatoes?"

"Nonsense, although it can't be considered a staple food, it still tastes very good! Steaming, cooking, roasting and frying, you can do what you want. ”

Liu Yu introduced them one by one, and the more everyone listened, the more excited they became, and the more they listened, the more red they became, and they couldn't wait to start sowing seeds immediately.

"Boss, what are you waiting for, plant!"

"What's the hurry~ I'll be there in a few days, don't worry."

Now the season is just right, as long as it is planted on a large scale, it can not only be self-sufficient, but also supply the arid Guanzhong area.

In the autumn and winter of the first year of Zhenguan, the climate in Guanzhong is extremely abnormal, the average rainfall is less than 100ml, and so far, there has been no large-scale rainfall.

This also indicates the beginning of the great drought in Guanzhong, which lasted for three years and the locust plague, which severely destroyed the social order of the Tang Dynasty and brought great disasters to the common people.

But now, history is about to be rewritten, Liu Yu will never sit idly by, out of humanitarianism, he also has to provide assistance. Of course, if there is an opportunity to make a windfall by the way, who will say no?

The people present exchanged heads and discussions, some felt that 10,000 acres should be planted, and some people built 20,000 acres. Su Qinghe knew more about the inside story and boldly built a plan: at least 50,000 acres of idle labor were developed, all of which were used for agricultural production.

After discussion, everyone unanimously agreed: in addition to training and duty, the soldiers of the corps should also be responsible for herding sheep and horses; More than 20,000 elderly and weak women and children are working hard to cultivate as much as they can, with no upper limit.

The old department of Nanchang Wang is responsible for mining, coal mines, iron mines, lime mines, clay mines... Wait, at least a dozen mines, two thousand people are barely enough.

These Tuyuhun people, all of them are strong and strong, and most of the women are also tigers and bears, since they have so much strength, it will be a waste if they don't work~

After allocating manpower, Liu Yu took out two maps, an ordinary high-precision map and a contour topographic map, on which more than a dozen locations were clearly marked, all of which were the specific locations of the mine.

"These are all mines, with a wide variety of types and different mining methods, mainly open-pit mining, and the escort team will provide technical guidance."

"Huh~ so much!"

Liang Sili was taken aback, there are more than a dozen mines, this task is not easy to complete! "General, what kind of mines are these?"

"There are coal mines, iron mines, lime mines, gypsum, dolomite, and a gold mine! Hehe~ You don't have to worry, the mining is directly responsible for the escort team, and it will not drag the corps back. ”

"Yes, General! What is this coal mine? ”

Liu Yu patiently introduced: "Coal ~ is charcoal, a black stone, which can be used as firewood and is very resistant to burning."

Coal is not uncommon, it was found as early as the Wei and Jin dynasties, but it was not mined in large quantities, and it was not widely used until the Yuan and Ming dynasties.

Liang Sili also heard about it, and suddenly realized: "Oh~ I have seen the coal, I heard that there is a flame mountain in Mobei, and the coal within a radius of more than ten miles is not extinguished all year round, and the temperature is very high!"

"That's a ~waste~"

"Boss, but what's the use of this coal, is it cooking on the fire?" The stone said that he didn't understand, and the wood could not be burned even if it was chopped, so why did he waste that energy?

Liu Yu looked at Su Qinghe and wanted to give her a chance to show her a face, but the latter lived up to her expectations and pointed to Sao Nian to criticize and educate: "How many times have I told you, we must take care of the environment, maintain the ecological balance, and cannot destroy the forest without limits!"

"Of course, this is not the point, coal is the food of industry, in smelting, chemical industry, electricity... and other industries, which have irreplaceable importance! ”

Although most people don't know much about it, they still look like they understand. They are more interested in iron ore and gold ore, and with iron ore, they can make weapons; With a gold mine, glory and wealth are at your fingertips.

"General, is that gold mine ~ big?"

"Yes, yes, how much gold?"

……

"Hehe~ I estimate, at least 100,000 taels!"

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