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"I think it's better to send troops directly to occupy Tiancheng, what kind of birdman is called Wang Qiang, 1 kilogram of saltpeter for 10 kilograms of grain, he can also say it!" After the people from the Amagi side left, the people in the conference room were still talking about this matter. Zhang Zeshan was even more angry.

But Chen Yuan shook his head very seriously and said: "The problem of saltpeter is a business problem, and it cannot be solved by force. If you can't buy it, you can grab it directly, that's a robber! We at the Steel Fortress don't do such things. What's more, we now lack more things besides saltpeter, do we have to rely on grabbing? Then we must not offend the survivor forces of the whole world. ”

"The Fort Commander is right, this is not good for our reputation, and it is not good for us to absorb other survivors in the future." Liu Jinlong said: "Unless we can become famous." But now it seems that Wang Qiang and the others in Amagi have become very restrained after understanding our way of doing things, and they do not take the initiative to cause trouble, nor enslave and abuse the survivors, but are completely honest in mining and collecting materials, and also pay wages to workers. We can't find a reason to send troops. ”

Wei Chen proposed, "Then why don't you pull the troops to the vicinity of Tiancheng for a drill?" It's always okay to scare them, right? ”

In the room, a few people nodded in agreement.

But Chen Yuan still shook his head and said: "This is still a forced purchase and a forced sale, and it is inevitable that people will be truthful." We're going to have to deal with other survivor forces in the future, and with such a stain, no one will be too willing to deal with us. Therefore, it is best for us to solve commercial matters in an upright manner. Rest assured, it won't be long before they come to their knees and beg us to buy their saltpeter at a low price. When the time comes, we'll find a way to swallow them together. ”

When Zhang Zeshan heard this, his eyes immediately lit up: "Fort Chief, you mean that you already have a way to get saltpeter from other places?" ”

Chen Yuan sneered: "Without Butcher Zhang, can we only eat hairy pigs?" Now we have at least two clear ways to get saltpeter. ”

"Great, what's the way?" Wei Chen asked excitedly.

"The first way is to make nitrate from the soil." Chen Yuan smiled and said, "Please tell Director Cai about this." ”

Smokeless gunpowder was manufactured by Mr. Cai, who later established the Gunpowder Research and Manufacturing Institute from the Salvation Army, and Mr. Cai naturally became the director of the Gunpowder Research and Manufacturing Institute in addition to his usual teaching tasks.

She was also present during the negotiations on the saltpeter-related deal.

At this time, Mr. Cai nodded and stood up and explained to everyone: "The so-called soil method of making nitrate is actually the method of boiling dung to make nitrate. ”

"Is it to boil feces? Such a heavy taste? Zhang Zeshan said with a look of surprise.

Liu Jinlong interjected: "I've heard of this. When I visited a Red Army memorial hall in the past, I heard from the narrator that our base area was tightly sealed by the White Army at that time, and it was difficult for all the supplies to enter the base area. Not to mention saltpeter, which can be used to make gunpowder. Therefore, the Red Army at that time mobilized the masses to boil dung to make nitrate, boiling three catties per family, and helped the troops solve the problem of gunpowder shortage. ”

Teacher Cai nodded and said, "That's right, the people have actually used the method of boiling dung to make nitrate for a long time. It's just that the use of soil to make nitrate has a large input and low output, which is far less convenient than the excavation of natural saltpeter mines. And the sanitation environment is also poor. Therefore, after the development of transportation, everyone generally bought saltpeter directly from saltpeter mines at home and abroad, and the local nitrate method was eliminated. Therefore, few people know about the soil method now, and we used to only tell stories. I know the method, but I haven't tried it. Whether it can be done depends on the experiment. ”

"It doesn't matter if it's dirty, how important gunpowder is now, everyone is pointing to it to save their lives!" Zhang Fatzi asked, "Teacher Cai, what should I do?" How much manpower does it need to invest, and how much can it produce per day after success? ”

"It's easy." Teacher Cai replied: "According to the ratio of 150 kilograms of urine or thin manure for every 1,000 kilograms of damp, loose and sandy soil, mix well and put it in a humid place to ferment, and after more than 20 days to become nitrate, you can refine saltpeter from it." Generally, 1150 kilograms of such nitrate can refine about 8 to 9 kilograms of saltpeter. ”

She continued: "It's a bit lower, less than 1%. But the good thing is that the output can be stable. There are now 32,000 inhabitants in the Iron Castle, and the sewage treatment plant disposes of about 50 tons of sewage suitable for saltpeter production every day. If all of them are used to produce saltpeter, about 3 tons of saltpeter can be produced per day. ”

"With mechanized production methods, digging, suctioning, transporting, spraying, mixing, and storing do not require too many workers. In the past, manpower alone naturally required a lot of people. But now an excavator can dig about 100 tons of soil per hour, and it can get all the earthwork needed for a day's production in 5 hours. The vehicles for transport also don't need much. The mixer can be made with a cement mixer, two sets are enough. The refining process can also be mechanized for batch purification, and the equipment is also simple. Therefore, it is estimated that a nitrate factory only needs less than 100 workers. The waste soil produced by the manufacture of saltpeter is actually a good organic fertilizer. ”

Hearing this, everyone has begun to nod frequently with smiles on their faces, especially Zhang Fatzi, who said happily: "This is actually not low!" With less than 100 people, 3 tons of saltpeter can be produced per day. It's much lower than the production cost of Amagi! ”

"That's right." Mr. Cai replied: "But the key question now is where to build the factory. After all, the smell of the nitrate factory is not good. If it is built in Hatu Village and Steel Castle, it is estimated that there will be no way to live in it! The production process is also prone to produce a large amount of methane gas, which is easy to explode in case of fire. But if it is to be built outside, there is no protection, and the safety of the workers is not guaranteed. ”

At this time, Chen Yuan proposed: "You can build a nitrate factory in Yunxi Town." ”

"That's right." Zhang Zeshan said: "There is a city wall built by the zombies before. Before we attacked Yunxi Town, the earth and stone walls there were two-thirds ready. One of the walls that we destroyed can be used with a little repair. It is more than ten kilometers away from the Iron Castle, and the smell will definitely not waft from this side. ”

Chen Yuan continued: "The nitrate factory works during the day and closes at night, and all the saltpeter produced every day is transported back to the steel fort by evening. I don't think anyone or zombies would be interested in a pile of stinking nitrate. During the day, we can send a squad of fighters to be in charge of guarding, and there is no problem at all to defend against scattered zombies. If there is a large number of zombie invasions, the border will definitely be detected and warned in advance. Personnel can be withdrawn immediately. There is also plenty of space to build a warehouse for fermented nitrate. ”

Everyone agreed. So the matter of making nitrate was decided.