After staying in Beichen Pavilion for a few more days, getting the benefits, and enjoying the scenery, Wang Feiyu and the three of them went down the mountain from the other side, and they began to enter the hinterland of Tanzhou.

Riding all the way forward, when they were about to reach the foot of the mountain, Wang Feiyi unexpectedly found that there was a desolate, semi-sandy land on the left side of their road, and when they reached the foot of the mountain. There were dozens of Beichen Pavilion disciples digging pits on that half-sandy ground, and there were also twenty or thirty disciples weaving squares out of hay, each of which could hold a few people, just like that, the squares were covered with sandy surface.

"What are they doing?" Wang Feiyu pointed curiously at those Beichen Pavilion disciples.

"Plant trees! In addition to carving and chiseling stones, this is the new way for us to train our disciples in Beichen Pavilion, after all, the appearance of this semi-sandy land is also inseparable from our Beichen Pavilion mining, the ancestor said that this move is in line with heaven and earth, and is beneficial to living beings!"

"When I came last time, I haven't seen it, when did you come up with the idea of planting trees?" Ye Qingchou nodded as he looked at the small saplings planted on the loess on the sandy land below the mountain.

"This is the inspiration that our ancestor received from watching "Children of the Rivers and Lakes" last winter!

“...... Hiss...... cough cough cough ...... Ahem, cough, cough!" first there was a strong inhalation sound, and then there was a coughing sound of saliva being sucked into the throat, and Liang Zijing's two words hurt Wang Feiyu and Huo Qinglong accidentally sucked saliva into their throats!

"Are you all right!" Liang Zijing looked at the two coughing with some puzzlement, while Ye Qingchou on the side pouted!

"It's okay! ahem...... You go on!" Wang Feifei touched his chest as he spoke.

"That's it, how did you get inspired!" Huo Qinglong's face was full of curiosity, he hadn't read this "Children of the Rivers and Lakes" just happened, but he wanted to find out and analyze it when he turned around!

In the book "Children of the Rivers and Lakes", there is a man named Jiang Xiaoyu, who claims to be the smartest person in the world, and there are two chapters in which he passes by a small city with yellow sand, and the city lord asks him how to make the city rich? How can he stop the yellow sand? Jiang Xiaoyu's idea is to plant trees, planting trees that can grow fruits and produce medicinal herbs in the desert. He also proposed several methods of sand control and tree planting, such as grass grid and drip irrigation, which we are trying now, and the disciples who heard the experiment say that it is very likely to be successful!"

Ye Qingchou, who could make a sentence on the side, almost suck saliva into his throat! He shook his head slightly, looked at Wang Fei, who was pretending to be deep on the side, and then let out an imperceptible sigh!

"You guys really value this porter's novel!" Huo Qinglong's voice unconsciously took on a strange flavor.

"I can't ignore it! Many of the things he writes are not written blindly, although sometimes some things are explained too clearly, which is not conducive to the flow of the novel, but it is really instructive!" Liang Zijing said but couldn't help but show a trace of admiration, which made Wang Feiyu a little embarrassed, he wrote like this, one is busy with other things, in a hurry, spelling the number of words, and the other is for the pride of the culture of the previous life, thinking that in the world of the previous life, in addition to novels, music, and many other things that are not affected by the law are also spread!

However, at this time, Ye Qingchou and Huo Qinglong both frowned, now there are few people in the world who recognize non-defeated, but it will be troublesome in the future!

"Brother Liang, speaking of which, is there a lot of sand or poor land in Tanzhou because of mining and the like?" At this time, Wang Feiyu remembered what Ye Qingchou said about mining to sand here.

"There are about seven or eight big places, and on average, each place has a radius of five or six hundred miles, and the one you see is the smallest, with a radius of three hundred miles!" Liang Zijing said and looked at the juniors who were bending over in the distance and digging a pit there, at this time they were going to plant a plant called Cistanche, which had high medicinal value, which was also the wisdom of the porter.

A few people talked, and the horses under their crotches kept moving forward, as if they didn't like the sand very much.

Liang Zijing may have mentioned that this sandy land has some feelings, and he also introduced it, "This sandy land used to be a mining place for iron and copper ore! Now there are also mines, but most of them are sparse and fragmented, and the mining value is not very large." ”

"Are there any associated mineral deposits?" When Wang Feiyu heard Liang Zijing say this, the first thing that came to mind was the associated mine.

"There are also associated mines, and the reserves are not small, but they are difficult to refine, and they are thankless, so they are just left and refined when they are used! Later, we piled up the slag that was difficult to refine over there according to the instructions of our ancestors, and piled them together! Since last year, we have also moved all the slag from other nearby mining places to fill in the pits in this sandy land, which can also be regarded as a clean-up, so as not to let a piece of land that can be planted be destroyed by the slag!" Liang Zijing said and pointed to a few raised hills in the distance, which were some distance from the place where the trees were planted.

"It's true that filling in the pit will stop the ground from subsidence, and cleaning the slag from the ground will prevent the harmful stuff from the slag from seeping into the soil that can be planted, but can you tell me what the associated ores contained in your slag are generally used for?"

"Slag is slag!

"Being difficult to refine does not mean that it has no value and cannot be refined in the future. "Wang Feifei just thinks that he is good at calculating, and he shouldn't be so simple in doing things! At least he had a lot of research on slag in his previous life.

"Brother Wang is right! Maybe there will be new means in the future, and these slags can be regarded as a small fortune. The associated ore in this slag, as long as people in Tanzhou know, there are mainly two kinds of metal ores used to refine weapons. Liang Zijing replied.

"What kind of mine is that?" Hearing that it was a mineral deposit for refining weapons, Wang Fei's curiosity became a little stronger.

"Chrome ore, titanium ore!" Liang Zijing gave his own answer.

Hearing this, Ye Qingchou and Huo Qinglong didn't react, but Wang Feicheng hissed and took another breath! Because whether it was the knowledge of the previous life or the knowledge collected through the 'Zhou Tian Xingyan' in this life, these two mines were not simple. However, when he first knew that he could refine and use these two kinds of ores in a limited amount, Wang Feiyi had already been impressed by the essence of this world, and it was not bad this time.

Ignoring the disciples of Beichen Pavilion who were sweating down the soil there, a few people rode their horses all the way and walked quickly from the half-sandy wasteland......

"Several, green mountains and green waters, there is always a meeting, please forgive Liang Zijing for not being able to send it far!"

"Well said!"

"Brother Liang, we'll take our leave!"

After the group said goodbye, Huo Qinglong leaned over: "I said that it was not defeated, why did you inhale again when you heard that mineral deposit just now? It's like a person who has never seen the world, the one surnamed Liang, I laughed at that time!"

"Senior brother, you don't know about being a doctor, but I have some knowledge about minerals and the like when I write novels. This chrome ore and titanium ore are all high and rare, and I don't know if the top three grades of weapons are in the nine grades, but one percent of the weapons in the middle three grades will use these two mines. In my opinion, these slags are the property left by the Dao Sect to future generations, after all, the alchemy of the Taoist sect is probably the best way to refine these two kinds of ores in my opinion!"

"It's really possible to say this, but don't forget that there are also Mo families, Gong Losers and other families who can also smelt ore!" Huo Qinglong said on the side.

"Brother Huo, don't refute it first, listen to the meaning of non-defeat, the weapons you said before won't all be the weapons of the Daomen, right?" Ye Qingchou figured it out a little at this time.

"That's true, I know in the collection of Tianfeng that there are many special mineral deposits, and only some sects have refining methods, and the world has not popularized them. This chrome ore and titanium ore belong to this situation, their refining is a secret that the Daomen does not pass on, these slags are not of great use to other forces, but the Daomen is not necessarily!"

"Yes, if it comes to the changes between things, Taoist alchemy is the originator!" Ye Qingchou on the side gave his own understanding, and he was also a little curious about Wang Fei's previous inhalation, "But since Feifei is talking about these two minerals, they are so spiritual, then what is the use of them?"

"Let's talk about chromium first! A little larger amount is poisonous, Senior Brother Huo, you should know that one of the diseases it causes is chromium sores written in medical books. ”

"Oh! I remember!" Huo Qinglong also knew about this disease, but he had almost never seen a disease caused by chromium in reality, and his main research direction was not this, so he ignored it for a while!

Seeing that Huo Qinglong remembered, Wang Feiyu continued: "The biggest feature of this chrome used in weapons is one word, 'hard', so plating a layer of fire on the surface of the weapon can not only prevent rust, but also make the blade sharper! It can be said that the iron is sharpened like clay!"

"What about titanium?" asked Ye Qingchou on the side.

"Titanium! It's not as easy to rust as iron, it's half as light as iron, but it has toughness, hardness, and it's said to be good when mixed with other metals!" Wang Feiyu didn't say it was too complicated.

"Looking at it this way, the value of these two is good! It can account for one percent of the middle three grades, which is not low! After all, the Dao Sect is not inherited from refining soldiers!" Ye Qingchou said and touched his chin, "But if you go further, you will be farther and farther away from the boundary of Beichen Pavilion, and closer and closer to the territory of the bald donkeys in the Hanging Temple!"

"I said Senior Brother Ye, first called the old ancestor of Beichen Pavilion, and now he is called the Buddha Gate Bald Donkey, this can't be done!

"Don't worry! Ye Qingchou waved his horsewhip as he spoke, speeding up, and Wang Feiyu also followed, but the sand on the left is big, it is estimated that he will have to see it for a day!