After hearing this, Guo Jia said, "Lord, if Cao Cao is allowed to develop, it will take a few years to have territory such as Yanzhou, Yuzhou, Xuzhou, Qingzhou, Sizhou and even Jingzhou. Then his strength will be too great."

After hearing this, Lu Ning said, "When Xiao, don't worry, Lao Cao's technological level is low, his weapons and equipment are not as good as our army, and his soldiers' training is not as strong as our army; now the population in my jurisdiction is more than ten times that of his. After I cancel the agricultural tax by the end of next year, the people around him will pour into our jurisdiction. No matter how big his jurisdiction is, there must be people. Without people, how to develop the economy and improve his strength. I estimate that in two years, the population we have will account for more than half of the Han Dynasty. We have a large population. Who are we afraid of? Lao Cao made a serious mistake in Xuzhou. He slaughtered the cities of Xuzhou and dug the graves of Xuzhou people. The people of Xuzhou hated him to the core. He won't enhance his strength after getting Xuzhou. Once he entered Xuzhou, then Xuzhou's

The people will run away soon; most of Yanzhou are controlled by Lu Bu, and he will not cherish the people. Next year, 60% or 70% of the people will pour into our jurisdiction. Even if Cao Cao recovers Yanzhou, there will not be many people. Yuzhou has been harmed by the Yellow Turban Army for so many years, and the people have almost escaped; Qingzhou Ganning and others have set up a stronghold and resettled a large number of people, and we will get most of the people in Qingzhou; Jingzhou Cao cannot defeat him; Sizhou has basically no population. If this is the case, even if Cao Cao controls so many states, the population will not exceed three or five million, and we will have more than 18 million people now. By then, our population will reach at least 25 million, and we will still be afraid that he will not succeed."

After hearing this, Guo Jia was shocked. What kind of concept is this? It turns out that the refugees have been resettled for so many years. Refugees are probably much higher than other princes. People in the world say that Lu Ning is stupid. For the victims, refugees spend too much financial, material and food. They would have thought that this is the capital to dominate the world. If I hadn't heard it with my own ears, I would have never thought of this. "Lord, today I know what great wisdom is, as if it were foolish, and I am hidden. It turns out that you have created an image of recklessness that is ignorant, ignorant, arrogant, and bold and reckless. In fact, everything is in your calculations."

Lu Ning smiled bitterly and said, "You are too rewarded. You all say that I am very careful in doing anything. The first thing I consider is whether to suffer losses or not, and to calculate gains and losses. I also say that I am a ecstasy of finance. But there is one thing you are not careful about money. I love money, but I do not care about the resettlement of the people. I am fully satisfied with the investment in science and technology. I also fully support the construction of infrastructure and water conservancy projects, and do not care about gains and losses. Of course, I will resolutely punish the corruption and corruption."

After hearing this, Guo Jia said, "Lord, then our army will just seize Guandu." I nodded in agreement.

Lu Ning said: "Fengxiao, when I was in Yecheng, I heard you know everything about boiling salt and phosphorus. This is true. I have arranged for people to dig salt and sulfur mines. Then you will teach them how to process them."

Guo Jia said: "Lord, do you really want to make those things? If that's the case, I will definitely teach them how to make them."

More than ten days later, the nitrate, sulfur ore and phosphorus were dug. Lu Ning placed the nitrate and sulfur ore in different places. They were two secret factories, and the workers inside were also very loyal and honest. Then Lu Ning took Guo Jia to the factory and asked Guo Jia to teach them how to boil nitrate, sulfur and phosphorus. Under Guo Jia's patient guidance, the operation could still be smooth. However, Lu Ning saw that the process of boiling was also very dangerous. If he was not careful, it would cause a big fire. At the beginning, several fires occurred, but Lu Ning prepared in advance and quickly put out the big fire. Of course, it was not enough to have nitrate and sulfur alone. In Lu Ning's impression, black gunpowder should be charcoal, but the ratio between the three was Lu Ning was not very clear. In fact, in later generations, black gunpowder could only be used to make fireworks and firecrackers. The one that was really used for war was efficient yellow explosives.

After several raw materials were prepared, Lu Ning began to prepare them. No one was present except Guo Jia who was around Lu Ning. Guo Jia was curious and had to watch them. He was very interested in new things. Of course, Lu Ning would not sweep his interest, and would not keep it secret. For the first time, Lu Ning prepared ten kilograms of black gunpowder, with a proportion of 70% nitrate, sulfur and charcoal each accounted for 15%. Lu Ning mixed the raw materials and put them in a wooden barrel to seal them. When they were taken outside to detonate, they would explode, but the effect was not very good, which made Lu Ning very dissatisfied. However, such a small unsuccessful explosion really shocked Guo Jia. He could not have dreamed that several useless things would have such power when combined.

After dozens of tests, the black gunpowder made by Lu Ning and Guo Jia achieved relatively success, especially Lu Ning added a little phosphorus to the sulfur and had an amazing effect. Finally, Lu Ning fixed the preparation ratio at 75% of nitrogen; 11% of sulfur and phosphorus, 14% of charcoal, and the firing wire was made into strips.

After the black gunpowder was made, Lu Ning and Guo Jia used cattle and horses as test items. Lu Ning prepared fifty kilograms of gunpowder, packed them with thin iron round barrels specially produced by Ma Jun, and sealed them firmly. He buried them underground. He led a few cows and horses over more than ten meters away. Lu Ning put the firing wire very long, almost five hundred meters away to hide. This time, even Ma Jun came. Lu Ning asked them to open their mouths, stuff cotton balls into their ears, and cover their ears with both hands.

Lu Ning ignited the firing line, and the speed was really fast. It was burned to the edge of the gunpowder in a short while, but there was no movement for a long time. Guo Jia said he was going to inspect it, but Lu Ning quickly pulled him away. What a joke? Later movies and TV shows that the explosives were delayed due to various reasons. Lu Ning would rather wait more than take risks, and he might lose his life.

Lu Ning had just pulled Guo Jia back for not much time, but only a deafening sound was heard, which scared Lu Ning, Guo Jia and the others. The gravel fell from the sky one after another. The power was indeed scary. Guo Jia was so scary that his face was pale, and Ma Jun couldn't say a word. After the explosion, Lu Ning first ran to the explosion place. Guo Jia and Ma Jun reported it and followed Lu Ning. They only saw a large pit on the ground. There were cows more than ten meters away. No horses were spared. They were all blown away to pieces. The cows that were twenty meters away were not hurt, but they were just frightened.

Guo Jia murmured to himself, "This is too powerful, just a few flammable items. How can it be so powerful after being combined? What's the reason?"

Lu Ning was checking the effect of this explosion. After listening to Guo Jia's whisper, he said, "Fengxiao, you don't understand this. Let me tell you that there is a special discipline called chemistry, which is to study the relationship between matters. As long as you understand the properties of each related matter, you can use different means and appropriate methods to synthesize many useful other substances based on the characteristics of various matters. This is also an unfathomable discipline."

Guo Jia couldn't understand this, so he asked helplessly: "Lord, there are books on this aspect, why don't I know, and I have never heard of it."

The chemistry books that come from this era are all strange and confusing in the eyes of Scholars. Who would be willing to study such things? Even if someone does it, it will be looked down upon by people. Even if they dare not say anything, they will not dare to say anything to the public. "For the filial piety, I have a few basic books at home, but there are no applications. Then experts in this field need to explore and study, and there is no ready-made things."

Guo Jia asked reluctantly, "Where did the lord learn something from?"

Lu Ning smiled and said, "Fengxiao, you know, it was taught by Sister Chang'e in the sky."

Guo Jia glared at Lu Ning and said depressedly: "Lord, aren't you fooling me?"

In the following days, Lu Ning asked someone to build a city wall of hundreds of meters long and build it according to the highest standards. At the same time, Lu Ning also successfully tested the detonator based on the explosion, which could speed up the detonation time of the black gunpowder and not easily cause dull fire. Guo Jia asked this and that patiently. Lu Ning explained to them for a long time, and felt that he was like listening to a heavenly book and could not understand anything. In the end, he had to give up and just attack Lu Ning from the side.

After more than ten trial explosions, the results were obtained. If you want to blast the very strong city walls above six meters high and allow soldiers to attack smoothly, you need at least one hundred kilograms of black gunpowder. If you only use 40 or 50 kilograms, you can only blast a gap, and the soldiers cannot launch an offensive.

Through repeated experiments during this period, Lu Ning found that it was necessary to make grenades and grenades and other things to do. Unless efficient yellow explosives were developed, the things Lu Ning made can only be used to blast down the city walls, and they had to be of considerable quantity, and the performance was unstable, which still needs to be studied. However, Lu Ning was also satisfied. The current problem of Lu Ning's army is that there is no better way to blast the city attack. Now that he has found a method, I won't think about it anymore.

Due to the successful development of black gunpowder, Lu Ning, Ma Jun and Guo Jia planned to build four factories, namely the nitrate factory, the phosphorus factory, the charcoal factory and the sulfur factory; among them, the phosphorus factory also developed matches, which is amazing. The market capacity is really huge. Lu Ning and others produced large quantities, which is also a very profitable factory; the other factories mainly meet the needs of producing black gunpowder; Lu Ning, the workers in the factory, all gave them certain shares, which was for the sake of confidentiality and increased their loyalty.

Through Ma Jun and his team's efforts over the years, the quality of the steel in Lu Ning has been greatly improved. Various steel shrapnel and steel wires with excellent performance can be produced smoothly, which also puts the weapons and equipment of Lu Ningjun to a higher level. In particular, Ma Jun and others have specially developed a powerful crossbow for individual soldiers, using a combined force of steel sheets, springs, etc., and its effective range reaches more than 500 meters. When launching an arrow, it is carried out with a shaker, which cannot be pulled open with human power. In addition, there is also a high-hard spring behind it. Crossbow arrows are specially made and made

It is very accurate and no other arrows cannot be used; the steel on the arrow is the best high-carbon steel, which can penetrate any armor and helmet within 500 meters. Of course, the equipment of Lu Ning's own soldiers is not the same. This powerful crossbow also uses the principle of rifle shooting in later generations, and can also aim, and can be used to hold the arm, and use a machine. Its only cannot be fired continuously. The arrow must be reinstalled. If the speed is fast, two arrows can be shot every minute. Its lethality is second only to the crossbow bed and the power of the crossbow cart. The advantage is that it can be used by individual soldiers and aimed.

When Zhang Liao and Gao Shunchu saw this powerful crossbow, their extremely powerful lethality shocked them. Lu Ning asked them to select a group of archery masters for intensive training, hoping to train several super crossbow snipers. This is the secret killer prepared by Lu Ning for the enemy generals. Lu Ning hopes that in the second army, the snipers of Lu Ning can quickly shoot the enemy generals and kill them, which is a heavy blow to the enemy soldiers.

If these powerful crossbow snipers are trained, then the Lu Ning army will have strong bow snipers and strong crossbow snipers. The two will cooperate with each other and will definitely have a great effect on the battlefield, which will also make the enemy generals look terrible and die at any time.

Before the New Year, Lu Ning also dealt with a small matter, that is, during the time when Lu Ning and the Zhen family jointly used Cao Cao to slaughter the towns of Xuzhou, the prices of real estate and real estate in Xuzhou City fell sharply, and Lu Ning and others purchased a large number of real estate in Xuzhou City. Now that Cao Cao's army has retreated, the real estate and real estate in Xuzhou City have risen all the way, almost reaching the price when Cao Cao attacked Xuzhou.

The price of Lu Ning when he acquired was only a little more than half the market price. Now Xuzhou has settled, and many wealthy people have returned to Xuzhou City. They also need to buy real estate now. Of course, Lu Ning and others took action immediately, and gave about 10% of the price discount. There are many real estate properties, but the real estate was actually repurchased by the original owners and real estate owners, but Lu Ning and others made a big profit from the middle.

Originally, the owner of the real estate sold the property was extremely regretful. In just a few months, he really lost a huge amount of money. Fortunately, Lu Ning gave them a discount of 10% of the price, otherwise they would suffer even greater losses.

After Mr. Zhen's subordinates took over the real estate and real estate in Xuzhou, they were very happy and ran over to report the situation to Lu Ning. Lu Ning only spent 2 or 3 million pure copper coins and made more than 20 million yuan, and the funds occupied only about half a year. Such huge profits are really refreshing.
Chapter completed!