One stone of rice in the Han Dynasty was equal to four pounds and one hundred and twenty catties, and Liu Zheng knew before that one pound in the Han Dynasty was only half a pound of weight in later generations.

In other words, one stone of rice is only equal to about 30 kilograms in later generations.

Three hundred stones, that is, nine thousand kilograms.

Even if he is 10,000 kilograms, this is the output of 100 acres of land.

Liu Zheng vaguely remembered that the yield of one mu of rice in later generations could be 350 kilograms! When the yield is high, it can even be five or six hundred kilograms.

For other crops, the yield is not particularly different from rice, but compared with the ancient land, it is several times higher.

Fortunately, under Liu Zheng's hand, he is located in Jiaozhou, and the planting of two seasons a year is very casual, and even occasionally compact, and he can also plant three seasons, so that the grain planted under him is enough, and the grain handed over by a county is enough for a state to eat for a year.

The rest is surplus grain, and Jiaozhou has no special products, that is, there is a lot of grain, and selling these grains and exporting them to other states and counties may be profitable.

Liu Zheng came to Youzhou this time, and he didn't bring much money, but he loaded a few boatloads of grain, because he didn't have enough money to buy horses, and if he wanted to buy horses, he could only barter them.

And what he has the most is food, and he can only exchange it for food.

However, grain was not particularly valuable at the end of the Han Dynasty, when the Yellow Turban Rebellion had not yet broken out, a stone of grain, but could only be sold for a few hundred dollars, and then there was a famine, and there was no harvest in many places, so that the price of grain gradually rose to the price of a stone of grain of thousands of dollars.

Of course, in some places where the famine is more serious, grain is also priceless and marketable, and the price will be even more expensive, especially in the hands of such ethnic minorities in the north, and the price of rice, millet, corn and other fine grain is even more expensive.

One stone can even be exchanged for more than two thousand dollars in the hands of ethnic minorities.

That's why there are merchants who go around doing business, because they can get several times the return by going back and forth and exchanging the scarce things in the two places.

And the grain of 5,000 koku is almost equivalent to the price of 1,000 gold on Karasuma's side.

Horses are very valuable in other places, ordinary horses are 8,000 or even 12,000 yuan, and the price of war horses is as high as 30,000 or 40,000.

On Karasuma's side, horses are not a rare thing, not to mention the large number of them, there are many wild ones in the wild, if you are lucky, you can see a herd of wild horses, tame a few wild horses yourself, and you can also make a fortune.

Although Liu Zheng didn't know what the price of the horses here was for the time being, he knew that it would definitely not be higher than other places, as long as he could get enough grain and exchange some war horses from Su Fuyan's hands, it would not be a difficult task.

"That's it, Su Yandanyu, I'll give you 20,000 stone rice, 20,000 stone, it should be able to let you spend this winter with peace of mind, and even have extra food, and even sending troops on an expedition is not a problem."

Liu Zheng pondered for a moment and offered a price that was enough to surprise Su Fuyan.

Sure enough, when Su Fuyan heard Liu Zheng say that he could take out 20,000 stone of grain, his face immediately showed a look of surprise.

"Is that true?"

Su Fuyan responded to Liu Zheng briefly, just to ask if what Liu Zheng said was true.

If what Liu Zheng said is true, it will really be a great news for Su Fuyan. Although the food for the winter of the tribe under his command is not particularly tight, if you save a little, you can still survive this winter.

But who would think that he has a lot of food under his hands, he can really get tens of thousands of stones of grain from Liu Zheng's hands, so that they can have a better winter, which is also a very good thing.

So Su Fuyan stared at Liu Zheng with dead eyes, wanting to hear a satisfactory answer from Liu Zheng's mouth.

Liu Zheng nodded. Soon responded to Su Fuyan.

"It's true, you think I'm joking with you? I said that if I could give you 20,000 stone of grain, there really would be 20,000 stone, or even more. ”

Liu Zheng first threw out his ability to give Su Muyan something, and after attracting Su Fuyan's attention, he changed the conversation.

"Of course, I didn't give you these grains for nothing, I also need some things, and I hope that Su Fuyan will be able to satisfy me."

As soon as Su Fuyan heard Liu Zheng's words, he knew that things were not so simple, and immediately put away the surprised look on his face, and after showing a somewhat serious expression, he asked Liu Zheng.

"What do you want?"

After Su Fuyan asked, Liu Zheng did not hide it, but generously opened his mouth and said what he wanted.

"I want war horses, you should have this thing, you can help me see how many war horses can be exchanged for 20,000 stone of grain!"

Although Su Fuyan vaguely felt what Liu Zheng wanted from the beginning, when Liu Zheng really said that he needed a war horse, Su Fuyan couldn't help frowning slightly.

Steed! This is a strategic material, a strategic resource, and it will not be easily traded. Even if they usually traded with those traveling merchants, they only sold a small number of war horses. It is not a transaction with a hostile force like Liu Zheng at all, and directly sells a large number of war horses, which is tantamount to an enemy.

Strengthen your enemies and weaken your own strength in disguise.

Although they have a lot of horses, they don't want to sell them directly to the big man like this.

Therefore, Su Fuyan still had some scruples and didn't want to hand over the war horse to Liu Zheng.

When Liu Zheng saw that Su Fuyan was silent, and the surprise on his face had dissipated for a long time, he understood what Su Fuyan was thinking at this time.

He immediately continued to speak, and said another word to Su Fuyan.

"Su Servant Yan Danyu, there is only one opportunity in front of you, if you don't agree, we can talk to another tribe, presumably other tribes are very short of food and grass, this winter is not so easy, whoever has food, who can sit back and relax, and in the coming year, they will even be able to attract more people to join and strengthen their tribe, but it is just around the corner."

Liu Zheng threw out his bait and waited for Su Fuyan to take the bait.

Su Fuyan looked at Liu Zheng silently, thinking in his heart, but in the end, he still couldn't resist the temptation of 20,000 stones of grain and grass.

"Okay, I can give you some war horses, but you must also know that we don't have many war horses here, and I can only give you four hundred war horses for your 20,000 stone grain and grass!"

400 war horses, in exchange for 20,000 stone of grain, if you calculate it, this price is not very fair, at least there is no pit Liu Zheng.