Helu's face became ugly, with a rare sense of loss and decadence.

Jiang qianxia saw he Lu for the first time. She thought it would be very pleasing to the eye, but she was wrong. Any normal person who sees a king in a panic will have a small feeling of suffering.

Embarrassed and Guli looked at each other, Jiang qianxia sighed, turned around and signaled Helu to follow in.

In order to prove his innocence, Jiang qianxia specially asked the ghost slave to find Li Xun as his companion in class, then closed the door of the study and spread the detailed map of the grassland on the table.

"This map!"

The moment he saw the map, he Lu's eyes didn't accidentally explode the killing machine - the things on it were too detailed, more detailed than the map he used for combat!

Guli glanced at him sympathetically. When he thought of seeing such a map for the first time, he seemed to be shocked, but with a sand table in the back, he got used to it slowly, so he was ok?

"No wonder, no wonder the king's several temptations were neatly beaten back by the garrison of Daqian before the big court meeting..."

Jiang qianxia turned his eyes and looked disgusted. "Come on, don't stick gold on your face. Let's go back to the city with the weapons of the border garrison."

He Lu's teeth creaked. Li xunxi glanced at him and seemed to be coquettish to get close to Jiang qianxia. He said with a smile: "Sir, not only he Lu Khan is curious, but also the students are curious about what limits bone profit and makes them so backward up to now?"

He Lu stared at Jiang qianxia intently and waited for her answer.

Without asking them to wait more, qiaosu put her hand on the map and Jiang qianxia stabbed, "what else can it be? Environmental restrictions."

"Those who are not blind can see that Gu Li mainly lives on the grassland. Due to the latitude and geographical location, it is not conducive to farming. In winter, the cold wind from Siberia can freeze to death."

"Because on the grassland, they can't keep a third of an acre of land for farming and food like us, so they can only raise cattle and sheep. Of course, the population is destined to be less than us."

"When the cavalry can't work, there are few people. Even if his warriors are one dozen and ten, they are doomed to die in the end."

First pull down the conclusion and see that he Lu is not convinced. Jiang qianxia spreads Daqian's map next to him.

"See for yourself, do you understand the strategic depth? The terrain is narrow and long. What depth are you going to go?"

"I don't know much about tactics. Let's talk about what you want to know most. How can the grassland develop?"

Helu's discontent was suppressed again. He was like a clever student waiting for his husband to answer his questions.

"Let's talk about how to feed more people without talking about luxury things."

After a pause, when he Lu, Gu Li and Li Xun all looked at themselves attentively, Jiang qianxia crossed his hands and shook his head playfully. "The answer is impossible. Even if he can feed more than 120000 people, it won't work."

"Hey, don't stare at me so fiercely. I don't have time to tease you."

Pretending to be afraid, Jiang qianxia moved back and took it seriously.

"The population on the grassland can only feed so many people. There's no way. Even if I teach you how to expand the herd of cattle and sheep, it's death. Once there are too many cattle and sheep, the grass will be eaten away, and the grassland will degenerate into a desert."

"If you want to live, you can only take cattle and sheep to migrate far away from the desert, and then gather in a range with more cattle and sheep, more people, and the faster the grassland is gone. Naturally, you can't live in the end."

"Can't improve the seed?" Helu asked without giving up.

The farming class talked all day about how to improve seeds. He knew that Jiang qianxia was not surprised.

Nodding casually, she shrugged and said, "of course you can improve the seeds, but the problem is, how much food can you expect it to produce in the land where only grass can grow?"

"In addition to being good at growing food, it will also hurt the land, okay? After planting food, the land will be barren in two years!"

"Even if you don't feel bad about it, have you ever thought that high-yield grain has always grown well in places with plenty of rain, warmth and long sunshine. Why can't the southernmost vassal state starve even if it doesn't farm? Because the family's environment is good, grain is naturally raised. It's no problem to grow three or four crops a year. On your grassland, it's a great progress to grow two crops a year , how to compare with others? "

"Well, if you recognize double cropping a year, it's no problem, but where do you have so many people to serve? If a tribe stays to farm, do you still raise cattle and sheep? If sheep can gnaw away the grass roots, you must stop the pace of nomadism immediately, build a city on the spot and burn a piece of cultivated land."

"But the city is so easy to build? Do you know where to get the money for those messy inputs? The grain is ripe in the first year, so you have to keep seeds? When you don't have enough food, you Khan can be eaten by them as a sheep, believe it?"

He Lu's face became more and more gloomy when Jiang qianxia said. Finally, he couldn't help hammering the table, "is there no way at all!"

"Of course there are ways, but are you sure you can do it?"

Looking at he Lu, who frowned suspiciously, Jiang qianxia whispered, "as I said earlier, the best development path for bone benefit is to hold big dry legs. When you buy food and vegetables from big dry, you are responsible for the supply of big dry meat, wool and horses. Win-win."

"Because of the nomadic lifestyle, Guli is doomed to have the same conditions for the stable development of technology as Daqian. Think for yourself, how poor are your craftsmen?"

"The times have changed. It's not the time when horses, knives and strength can kill people. Do you know how small the cost of spreading an epidemic to you is? Do you know that gunpowder weapons kill people faster than mowing grass? As for the power brought by horses..."

Jiang qianxia was stunned when he said this. He suddenly patted his forehead, slipped Li Xun's collar and dragged him outside the door.

"It's terrible. Go to your senior brother Jiang Wenjie and ask him not to read indiscriminately. Think about the steam power problem carefully. As soon as he figure out some signs, I can give out the textbook!"

"Steam power?" Li Xun didn't know why he was holding the door and didn't want to go out.

He knocked on his head angrily. Jiang qianxia urged angrily, "don't linger here for me. I tell you, with steam power, what kind of carriage and ox cart do we use? Sir, you can let the iron cart load hundreds of thousands of Dan at one time and run by yourself!"

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