The next day, Tian Fan confessed and didn't go out, and asked Zhao Yu to go to the Taishou Mansion to deal with daily affairs, and toss things in the Zhao family by himself. Zhao Yu assigned Steward Xu, who had just been promoted and raised, to Tian Fan, and asked him to listen to all Tian Fan's orders, even if he wanted to go to the house to uncover the tiles. Lu Su and Liu Ye are with Dingtian Fan anyway, what is he doing, both of them follow.

Tian Fan didn't want to toss around, he wanted to do an experiment on refined salt extraction, see the effect, and then improve it.

According to Tian Fan's arrangement, Steward Xu found a few clean wooden barrels, cauldrons, linen, soda ash and other things needed, and found a few small servants to help.

Relatively speaking, the conditions of that era were limited, and Tian Fan could only rough process coarse salt. There are also debris such as sediment in coarse salt, as well as substances such as magnesium chloride, and its removal method is just filtration.

According to the knowledge learned in the previous life, 100 grams of water can dissolve 36 grams of salt, and Tian Fan must first dissolve the coarse salt to be purified. The process of dissolving is time-consuming, but there is no way but to wait. In about half an hour, more than 30 catties of salt were completely dissolved. A layer of sediment had settled at the bottom of the wooden barrel, and Tian Fan asked a few servants to carefully pour the salt solution into the wooden barrel with several layers of linen cloth to filter out the sediment.

Then the soda ash that has been dissolved is added to the filtered salt solution, and sure enough, a large amount of flocculent milky white precipitate appears. The few onlookers were greatly surprised, and Liu Ye exclaimed: "I never thought that Boguang would still know Taoism!" "In ancient times, those who engaged in chemistry were Taoists, and their purpose was alchemy, so chemistry was collectively called Taoism or Danxue in ancient times.

Tian Fan shook his head and said, "Hehe, it's just a little dabbling!" "Wait until there is no precipitation and regeneration, Tian Fan stopped adding soda ash. Filter the solution again to remove the precipitate. Pour the solution into the pot and start cooking over a small fire.

That's it! Speaking of which, there are many other chemicals in coarse salt, but the conditions are limited, and Tian Fan can only do this. After adding the soda ash solution, most of the magnesium chloride and calcium chloride are removed, and the salt boiled out is a refined salt that is whiter and finer than well salt! The refined salt that has been reprocessed has a salty but not astringent taste, and it is already a high-quality thing.

Sure enough, the refined salt boiled out is indeed okay, although it is not as good as that seen in later generations, but it can completely pass the test!

In the next three days, Tian Fan has been perfecting the process without leaving home, and writing down the accidents and dangers that may occur in the experiment for later use.

On the fourth day, the process of extracting coarse salt essence was finally perfected, and Tian Fan's work was finally completed. The participation of those little guys from beginning to end is no less than Tian Fan's level now. Tian Fan even joked that you can teach your disciples!

On the sixth day, the small officials and old farmers sent by Liu Bei were in place, and a few days earlier, the small officials and old farmers sent by various counties in Guangling had also arrived, and Tian Fan could start another job.

If you want to say that Liu Bei sent these people, there is a small story. It is said that on the same day, the five-hundred-mile urgent messenger sent by Zhao Yu to deliver the letter arrived in Xiapi and handed the letter to Liu Bei. Liu Bei was stunned when he saw it...... I just asked for two hundred officials, why do you want more? And the old peasants, what's the use? He was puzzled, and when he was discussing with Chen Qun, another urgent letter was handed over. It turned out that Zhao Yu wrote a letter under Tian Fan's instructions, but he was confused, he only knew that Tian Fan wanted these people to be useful, but he didn't know what it was for, and seeing that Tian Fan was in a hurry, he had to send the letter over first. But it didn't take long for Tian Fan to say his thoughts, Zhao Yu immediately wrote another letter to Liu Bei, and then handed it over.

Liu Bei drank the tea casually, while reading the newly arrived letter, as soon as he opened his eyes, the tea in his mouth squirted out, followed by a violent cough. Chen Qun and the others were in a mess, and it was easy to figure out the cause of the incident, and they hurriedly sent people out according to Tian Fan's request. At the same time, Liu Bei gave a death order, and he must arrive within five days! …,

This is a small valley located in the north of Gwangneung City, the terrain of two mountains sandwiched by one valley, there are no large stones on the mountain, and a small stream flows down from the intersection of two hills, this place is very suitable for terraces. What's even more rare is that this place has not been developed at all, and no grain has been planted, so I am not afraid that someone will not be willing to fool Tian Fan. As early as two days ago, Tian Fan asked for 2,000 soldiers from Zhang Fei, and swept away all the plants in this area, and at the same time suffered all kinds of beasts, insects and fish living here.

From the morning, the old peasants and small officials from all over the county began to concentrate here. The officials who were transferred from Guangling maintained order, and after all their efforts, these people were finally able to look good. The entire mountainside was full of people, all discussing why they had come here. As far as the eye can see, there are thousands of people in a dense crowd.

Fortunately, it's not hot today, otherwise it would be unbearable! Around midnight, one after another, hundreds of carts began to rush here. The car was loaded with stones one by one. The local stonemasons in Guangling have been affected, and they have found a lot of stones from other places in the past few days.

Finally, after the car stopped, Tian Fan, Zhao Yu, Liu Ye, Lu Su and others arrived.

Tian Fan stood on a big car and shouted loudly to the crowd that gathered around: "Fellow villagers, all officials! Today, I'm going to teach you how to grow millet and wheat on the mountainside! Inevitably, the crowd began to discuss wildly. Some people don't believe at all, how can it be? We have been planting the land for decades, and we can't grow good food in the valley, how can this be wrong?

After waving and calming down the crowd, Tian Fan said, "Now, let's start right away!" ”

Drive the crowd down the mountainside, organize people to carry stones, organize people to remove dirt from the foot of the mountain...... waited for the work, Tian Fan handed it over to Zhao Yu, and he just taught these old farmers how to do it.

Terraces are generally built from the foot of the mountain. The soil at the foot of the mountain is turned upwards first, and then twenty or thirty centimeters of ground are dug out. Stones are placed in the foundation, and as the height of the stone wall increases, the roots of the stone wall are stacked with soil, and when the stone wall reaches a certain height, the terraces at the bottom are completed. Then, head to the top of the mountain in the same way.

By the time the first level of terraces was completed, everyone had already realized that the day was the right time! So, without mobilization, those old farmers began to help! The whole valley was filled with an atmosphere of great fire, and the old farmers were eager to get to work. In one day's work, the entire small valley has been transformed into terraced rice fields. Tian Fan's job is to teach them that there should be a path and what kind of terrain should be dealt with.

In fact, the method is very simple, and the key is that no one thought of it. In the following days, these old farmers and small officials devoted themselves to the construction of the terraces with unusual enthusiasm. Tian Fan's requirement is that everyone must become a skilled hand! They are the teachers of the future, and if they are not familiar, how can they teach the students?

And those big clans in Guangling are also crazy! They don't have any good land, and now that Tian Fan has given them such a good way to turn worthless sloping land into flat land, how can they not be excited? As a result, everyone began to be enthusiastic and busy. But Tian Fan's words knocked their enthusiasm away! Tian Fan said: "Now this season is not suitable for building terraces, it is better to wait until winter!" After the autumn harvest, the terraces are built, and after the winter snowfall, the soil freezes, and the soil thaws, so that the terraces can be fruitful. Now these people are just to let them learn, and when they go back, they still have to build terraces in the winter when the farming is slack. ”

Those who came from the coast, as well as the first batch of officials sent by Liu Bei, Tian Fan taught them the purification of coarse salt, and asked them to become teachers when they went back and teach this technique to salt farmers. …,

That night, Tian Fan and the others returned to Zhao Yu's mansion. Zhao Yu kept laughing, laughing...... It's obscene! Tian Fan asked him why, and he said: "Boguang, hehe, Boguang is really a god!" I really admire you now, what a whimsy! Tian Fan smiled and said, "Actually, it's nothing, it's just that I thought of it first!" ”

Lu Su and Liu Ye didn't speak, thinking quietly about their hearts. Tian Fan said to the two of them: "Two, what did you think of the proposal last time?" Neither of them spoke, Tian Fan was helpless, they were all smart people, at least much smarter than themselves, and their eloquence really had no possibility of persuading them.

On the third day of the construction of the terraces, Tian Fan heard a message from Liu Bei that he didn't want to hear - Lu Bu was here!

Tian Fan was directly stunned! This is a major event that has a far-reaching impact on Liu Bei, why didn't he think of it?

In a hurry, the follow-up work was arranged, and Tian Fan wanted to rush back to Xiapi immediately. Tian Fan explained to Zhao Yu that the officials and farmers who came successively must learn how to build terraces and boil salt before leaving. In addition, on the issue of providing fishing boats for the people on the beach, Tian Fan's idea is that there should be one fishing boat for every two to three households. Of course, it is not free, and the people who use the fishing boats must pay taxes, that is, pay fish, and on the basis of ensuring their livelihood, a certain amount of fish per day until it is repaid. Except for some of the fish they handed over and directly shipped to the mainland for sale, the rest will be made into dried or salted fish, which will be sold and fed to the army. Zhao Yu listened very carefully and promised that this matter would definitely be done.

Needless to say, Zhang Fei is a person who has led an old soldier, so there is no need to explain it anymore. It's just that after I heard that Lu Bu came to Xiapi, the gang was arguing to go back, saying that he wanted to protect Liu Bei. Tian Fan said that Liu Bei was still protecting Guan Yu in Xiapi, and he was not afraid of any problems, so he persuaded Zhang Fei.

Lu Su and Liu Ye said goodbye and left the day after they built the terraces. Tian Fan had nothing to say, so he had to reluctantly bid them farewell.

After consulting with Zhang Fei, he will return with 19,000 troops. With so many troops returning together, the preparation time required was not short. In addition, the 6,000 private soldiers had to say goodbye to their families, which took even more effort.

It was not until three days later that the army set out.

Tian Fan was anxious, Lu Bu is here, who knows if something will go wrong?