"In Xia Huang Hansheng, I have seen great sages and good teachers, Lu Qushuai, and Zhang Qushuai."

Huang Zhong hurriedly saluted, Hansheng was his word, and it was called so to outsiders.

"You're the leader here?" Zhang Jiao asked.

"Exactly." Huang Zhong nodded.

"Take me to see the process of boiling the nitrate." Zhang Jiao said.

"Okay." Huang Zhong nodded and took Zhang Jiao to visit the whole process.

Lu Yu followed behind, listening to the name Huang Hansheng, he felt very familiar.

Hansheng should be a word, is it Huang Zhong?

However, no matter who it is, it can make him feel familiar, and his face is not ordinary, so he must not be an ordinary person.

Can't miss it, wait until it's under your command first.

In the nitrate pit, the smell of nitrate water is like pungent cat urine, and boiling nitrate water is equivalent to boiling cat urine.

The taste is very sour and pungent, and most people absolutely can't stand it.

But when you come here, the people who do this work are all hard-working people, and they are not afraid of death, where are they afraid of this smell?

And they are completely accustomed to the smell and do not find it pungent at all.

But it's different for newcomers.

Lu Yu raised his eyebrows.

Zhang Mancheng couldn't help but cover his nose.

Although Zhang Jiao felt that it smelled unpleasant, he did not cover his nose.

He looked at the boiled white crystals: "The thing that floats up is the finished product?" ”

"Exactly." Huang Zhong nodded.

"How's the yield?" Zhang Jiao asked again.

"300 picks of soil, plus 600 picks of water, can finally boil out 200 picks of finished products." Huang Zhong replied.

"The yield is quite high." Zhang Jiao's eyes lit up.

"The finished product boiled out here has to continue to be processed, and the final product is only about one hundred and twenty or three." Lu Yu explained beside him.

Zhang Jiao turned his head to look at Lu Yu, and asked curiously: "This boiling method is also what you found from ancient books?" ”

"Yes." Lu Yu nodded.

He didn't lie, he did see it in ancient books.

It's just an 'ancient book' more than a thousand years later.

The boilers continued to work, and Lu Yu continued to explain to Zhang Jiao.

"This thing actually has other functions."

"This is the best material for tanning leather, and it is also a first-class fertilizer!"

Listening to Lu Yu's words, Zhang Jiao said with some surprise: "Fertilizer? Works well? ”

"Of course." Lu Yu nodded: "This thing is better than any kind of fertilizer in the world, and with this thing, it can at least double the yield per mu, or even more." ”

Lu Yu's words are not exaggerated at all, this kind of thing is used as fertilizer, which is better than modern fertilizer and urea.

The essence of nitrate is a solution containing potassium nitrate or sodium nitrate.

The process of soil nitrate boiling is to separate potassium nitrate and sodium nitrate from nitrate water.

Sodium nitrate is a small salt, this thing can't be eaten more, eating too much will have a certain harm, so it is more suitable for marinating meat and pickles.

Of course, it is definitely possible to eat, in this era, farmers usually only have the opportunity to eat salty when they are working, where is it harmful to eat too much?

It's rare to be alive!

As for the cave nitrate that is boiled, the essence is potassium nitrate.

In addition to its original purpose, it can also be used to tann leather, or it can be used as fertilizer and sprinkled on the ground.

In a way, this is pure natural chemical fertilizer.

Its nutritional richness is not comparable to ordinary chemical fertilizers.

The only downside is ...... Raw materials are too expensive.

It is simply not possible to promote it on a large scale.

In terms of value alone, the fertilizer that is sown is several times more expensive than the grain that is harvested!

Who does this kind of business?

But.

Sometimes, it can be very useful!

Zhang Jiao understood Lu Yu's thoughts, and couldn't help but nod and said, "If it's really as you say, we can completely create auspiciousness manually!" ”

The best land, the best fertilizer, the best seeds, all the factors together, can create a myth of a thousand catties per mu.

This is not an exaggeration, because one catty in this era is almost half a catty in later generations, so it is said to be a thousand catties, but in fact it is less than five hundred catties.

With this kind of fertilizer, plus good land and good seeds, it is not too simple to achieve a yield of 1,000 catties per mu.

In this era, this is the greatest auspiciousness!

"After the nitrate extracts these two things, the remaining wastewater is considered a treasure." Lu Yu continued.

"How?" Zhang Jiao was a little surprised.

"The last remaining water is brine, which can be used to order tofu." Lu Yu explained.

Tofu was invented by Liu An, the king of Huainan during the Western Han Dynasty, and it was already a common food during this period.

Listening to Lu Yu's series of explanations, Zhang Jiao's mood was very subtle.

How could Lu Yu have thought of this?

Are these in ancient books?

Why didn't he find it?

For a while, Zhang Jiao had already begun to regret it.

Knowing this, he didn't leave Lu Yu behind.

Originally, he was going to make him a pawn to hinder Zhang Mancheng, but who would have thought that he would cooperate with Zhang Mancheng for a win-win situation, and use this series of industries to develop Nanyang's Taiping Road thriving!

In the gunpowder industry alone, a series of workshops are interlocking, and I don't know what to do in the future!

It is estimated that if Lu Yu is taken away now, he will not be willing, right?

And it's too inferior, others just get better, you can't wait to pick peaches, it's too ugly.

This is not Zhang Jiao's style of doing things.

Soon, everyone was ready to leave.

Lu Yu found Huang Zhong and threw out an olive branch: "You are very good, do you want to come to work under me?" ”

"Huh?" When Huang Zhong heard this, he was stunned for a moment, and subconsciously said, "But ...... here"

"There's another captain here." Lu Yu stared at Huang Zhong.

Huang Zhong also realized that his opportunity had come, and hurriedly said, "I am willing!" ”

"Okay, then follow me, I'll take you to eat meat!" Lu Yu smiled.

"Good, good! Thank you Lu Shuai! Huang Zhong nodded excitedly.

Zhang Jiao and Zhang Mancheng were a little surprised when they saw this scene, but they didn't say much.

This young man is indeed good, and it is indeed a waste to put it here to boil nitrate.

Lu Yu's solicitation is also normal.

Then the group went to visit the charcoal-fired earthen kiln, which was also the last stop.

……

At the dinner party.

Lu Yu sat next to Zhang Jiao, everyone laughed, drank wine, ate meat, and was so unhappy.

Zhang Jiao looked at Lu Yu with a smile and said, "I came over this time and prepared a gift for you, I don't know if you will like it." ”

"I will definitely like the gift from Master." Lu Yu said seriously.

"Here, this book is for you! The talismans I know are all from this book. Zhang Jiao took out an ancient book and handed it to Lu Yu casually.

Lu Yu hurriedly took it, he also thought about asking Zhang Jiao for the talisman technique, but before he could open his mouth, Zhang Jiao had already sent it over.

Ancient books are heavy, and the material of the book is not ordinary paper, but very textured animal leather.

The four big characters in the book - "Fu Zheng Xiao Jie".