Yizhou County is located in the southernmost part of the south, in later generations it was the Yunnan area, although it is August at this time, but here is still the four seasons like spring.

However, Liu Chan set off for Chengdu, and the farther north he went, the weather gradually became hotter.

After walking for more than half a month, the army arrived at Pingyi County.

"Shizi!" Li Hui led the city officials out to greet him.

"How's it going?" Liu Chan and Shui Luoyi got out of the carriage, and Liu Chan couldn't wait to ask Li Hui.

What Liu Chanruo asked, naturally, was corn and sweet potatoes.

It was March when Liu Chan went south, and after teaching Li Hui how to grow sweet potatoes and corn, he went south to Nanzhong.

Sweet potatoes can be bred in mid-April, planted in May and June, and now it's late August, and the corn should have grown almost as long as the time comes, and the sweet potatoes will have to wait until around October to be harvested.

Li Hui had joy on his face, and said in a low voice: "The son of the world has succeeded!" ”

Liu Chan breathed a sigh of relief when he heard this, he was afraid that Li Hui didn't grow it, so he wasted a lot of points in vain.

"Don't go into the city first, take me over to see!"

Li Hui nodded and said to an official: "You take the soldiers and horses of the prince to the garrison to rest, and I will accompany the prince to go shopping!" Prince please! ”

Under the leadership of Li Hui, Liu Chan followed Li Hui to a field outside the city.

Looking at the remote farmland in front of him, as well as the soldiers patrolling the sky, Li Hui explained: "Shizi, you have left too many seeds, and many farmlands are too exposed, I am worried that planting in these fields will be discovered by merchants from the south and the north, so I planted sweet potatoes and corn in the fields of the three surrounding counties in relatively hidden places, and sent soldiers and horses to guard them, so as not to be detected." ”

"Well done! Now that three counties have been planted, the corn is about to mature, so you can invite your father to come and watch, and then your father will vigorously promote planting, and at most the next year you can plant it all over Yizhou.

At that time, this will definitely not be able to hide from Cao Cao and Sun Quan's eyes and ears, even if the road is blocked, this kind of seed will be more or less leaked out, but if you can hide it for a year, it will be a year, and we will have an advantage for a year! Liu Chan nodded, agreeing with Li Hui's approach.

Looking at the green corn forest in front of him, one by one like a soldier's upright corn stalks, on which strong corn grows, Liu Chan's eyes were full of joy.

This is the foundation of his domination of the world!

Deng Ai and the others are not very old after all, so they have already come up to observe, and Liu Yin and Jiang Gan are also talking about it in front of the corn.

Liu Chan looked at Shui Luoyi, only to see Shui Luoyi looking at the corn in the farmland with an expectant expression.

"You can go check it out, too!" Seeing Shui Luoyi's curious face, Liu Chan smiled faintly, waved his hand and said.

"Hmm!" Shui Luoyi nodded and trotted all the way to the edge of the field.

Li Hui said to Liu Chan excitedly: "Shizi, now the corn is almost ripe. It is conservatively estimated that the yield per mu should be about 500 catties! ”

After listening to Li Hui's words, Liu Chan calculated in his heart that even if this corn seed was the best quality seed in the system, its yield was very different in different regions.

For example, in the northeast and northeast regions, the yield per mu can reach 7 or 800 kilograms, while the yield per mu in the south can only reach 600 kilograms.

Yizhou belongs to the south, and its yield per mu in later generations is about 600 kilograms.

Convert this data into the yield per mu that Li Hui said is 500 catties, and the yield per mu should be 800 catties per mu when calculated by Han mu and Han catties, but the technology in this era is too backward, and Li Hui's current planting can only reach 500 catties per mu, a difference of nearly double.

However, despite this, this data is many times more than the yield of 100 catties per mu of rice and wheat planted today.

Cao Cao is stronger than Liu Bei, and he doesn't care that he is strong because he has a large population and a lot of fertile land.

Although Liu Bei now occupies Jingzhou, Jiaozhou, and Yizhou, the territory is not smaller than Cao Cao, but Liu Bei occupies most of the barren land, which is vast and sparsely populated, such as Nanzhong, Jingnan, and Jiaozhou, and the only rich places under his rule are Hanzhong, Liangchuan, Nanjun and other places.

However, under Cao Cao's rule, there were the Central Plains and Hebei, all of which were rich plains, all of which were fertile fields and had a high population density. The area of Yizhou is several times larger than that of Jizhou, but if you only count the number of fields, I am afraid that there are more fertile fields in one Jizhou than in Yizhou and Hanzhong combined.

But now this corn and sweet potatoes are promoted, and one acre of land can be harvested several times more, which is equivalent to Liu Bei's several times more fields, so that the gap between fertile land will be reduced, and there will be more grain and more population.

The gap between Liu Bei and Cao Cao will become smaller and smaller.

Liu Chan looked at Li Hui and asked, "How are the sweet potatoes growing?" ”

"Shizi, please!" When Li Hui heard this, he took Liu Chan to another field.

The fields are covered with green vines, covering the ditches.

Liu Chan squatted down and dug on the ridges, but after a while, he found two fist-sized sweet potatoes.

"Shizi, how is this growing?" The corn is ripe, Li Hui is relatively familiar with the planting of corn, but he still knows little about sweet potatoes, and he doesn't know if this sweet potato is mature.

Liu Chan shook his head and said, "There are still some that have to grow, the biggest one can grow to the size of a head." ”

Li Hui sighed and said: "This sweet potato is really rare, just a few green vines, cut and inserted in the soil can actually survive, it really opens my eyes!" ”

Liu Chan shook his head and smiled, and pulled up a sweet potato vine from the field, this sweet potato vine has not been turned over for a long time, and the aerial roots are propagated into the soil.

Liu Chan pointed to the root of the vine and said: "This is called the air root, the sweet potato is to survive on this, the soil to survive the green vine to grow after it grows to turn, otherwise the air root into the soil, it will compete for the nutrients of the taproot, you see, the sweet potato on the air root is not big."

Not only that, but the nutrients are not enough, and the sweet potatoes of their taproot do not grow much. ”

Liu Chan pointed to the thumb-thick sweet potato that he had just brought out of the soil, and patiently explained to Li Hui.

Now Liu Chan has taught Li Hui all the planting techniques, and the promotion of sweet potatoes and corn will need opportunities to carry out in the future.

Li Hui suddenly realized when he heard this: "I see, there is a field where the soldiers are lazy and do not turn the vines, and the sweet potatoes grow thin and long, which is very different from the sweet potatoes in this field, it turns out that this is because of this." ”

"It's a pity, so the yield of that field is at least half less!" Liu Chan sighed and said.

Li Hui looked at Liu Chan with admiration: "I didn't expect the prince to know so much about farming, my Yizhou is mountainous, and growing food is not as easy as the plains, it is not easy to cultivate, nor is it convenient to irrigate, I don't know if the prince has a solution." ”

"The only way to do this is to improve the farming tools!" Liu Chan secretly said in his heart, but he didn't know much about farm tools, although he had seen it, but he didn't know how to make it, so he could only wait for the points to come out, so he shook his head and said: "This is not in a hurry, now that the corn is almost ripe, and the sweet potatoes have also grown, you can send someone to inform your father and let him come here to have a look, remember, just say that this kind of seed was found in the ancient barbarian tribe!" ”