Brother Zhang doesn't care about any prince and princess, he only cares about his nitrogen, phosphorus and potassium.

Because there are now steel mills and coke factories on hand, coal is not a particularly scarce material, and many large-scale open-pit coal mines have also begun to be mined, especially in Shanxi and Shandong, where the Liao people have begun to transport coal on a large scale in order to make money for stainless steel basins.

Coal will produce a small amount of ammonia gas during the coking process, which is due to the fact that the coal itself contains certain nitrogen-containing heterocycles, and these nitrogen elements will be released in the form of ammonia gas during the coking process and mixed in the coke oven gas. In fact, in the era when human beings did not develop the synthesis of ammonia, nitrogen was obtained through this method. Then it is only necessary to use the contact method, the lead chamber method and the dry distillation method to produce sulfuric acid, and then use the sulfuric acid absorption method to make nitrogen fertilizer.

Coupled with the fact that many public toilets have been built in the county and there is a policy of fines for outside, nitrogen fertilizer is actually the easiest fertilizer to obtain.

The chemical equation for the refining of superphosphate, which has the lowest known technical content, is 2Ca5F(PO4)3+7H2SO4+3H2O=3Ca(H2PO4)2· H2O + 7CaSO4 + 2HF, there are not many phosphorus-containing ore reserves here, and the largest phosphate rock is in the territory of the Great Song Dynasty, so phosphate fertilizer is a little more difficult but limited than nitrogen fertilizer.

The most difficult thing is to belong to the potassium mine, the production process of potash fertilizer is also very simple, some salt lakes in Qinghai have a high potassium content and can directly provide potassium chloride, but to use as a fertilizer, it also needs fatty amine flotation, and purify after separating sodium, calcium and magnesium, but the problem is here, the refining is simple, but Qinghai at this time is a wild area, it is really a love across the mountains and seas.

If you want to extract potassium, you either burn a large amount of plant ash, or sieve salt wells with high potassium content in the salt wells of Sichuan, but the problem is that it is better to say otherwise, only this salt, which is a strategic resource controlled by the state, even if the emperor agrees, the interest groups will not agree, they can tolerate Brother Zhang's development here now, the only reason is that the place is too small to be worth their teeth, but if they really want to reach out to the salt area, then they have to eat people.

So Brother Zhang can only find another way, that is, to go to Ningbo to dry in the sea......

Brother Zhang got in touch with Ningbo, that is, the local camp in Mingzhou, he couldn't care so much anyway, so he smuggled salt directly with the army, anyway, the surrounding countries needed a lot of salt, Brother Zhang not only gave them the method of drying salt and purifying but also provided them with a market.

And what Brother Zhang wants is not refined salt, but the kind of coarse sea salt that can't be eaten, what he wants is the feeling of impurities, the cost of drying salt is not high, and the Great Song Dynasty has now shown a perfect strategy of emphasizing literature and light martial arts, so the life of the army is not easy, and the forbidden army is tight, not to mention the reserve army in those coastal areas.

So the two sides hit it off, and soon reached an agreement, and the first fertilizer plant in the world officially started the construction plan, although the output of fertilizer is not estimated to be high, but it can meet the production and preparation of this place, anyway, on the whole, in the next three to five years, the yield of food crops can steadily increase by three to five times.

With high-yield grain, even without potatoes and corn, it can ensure the development of rations and breeding industry, which is the top priority of Brother Zhang's concern, after this big stone in his heart landed, Brother Zhang quickly carried out the planning plan of the surrounding land, the bridge repair, the road repair, the cement This thing has a huge low cost and a huge effect, and it is time to use it.

Anyway, now the whole of Yuhang is like a big construction site, basically the money earned by the finance is stuffed into the infrastructure, but the earlier population introduction plan has almost sucked up the surrounding towns and villages, and the people everywhere are almost empty, and Yuhang County has also expanded from about 20,000 people when Brother Zhang first took over, and has expanded to nearly 200,000 people in three years.

This is already the population size of a medium and large city, if it weren't for Brother Zhang's good layout and use of the advantages of the Grand Canal to build this area into a composite city, Yuhang would not be able to eat so many people.

But even so, he was far from satisfied, and still kept absorbing the migrants from his surroundings, giving many preferential measures to drain the people, and even began to stretch his hand to the border refugees.

But fortunately, even if you eat another 200,000 people, there will be no particularly big problems here, one is that the land has not been developed to the limit, and the other is that fertilizer plants and some related supporting enterprises also need a large number of people, after all, industrial scissors are not a joke, and the things produced by Yuhang are not produced and imitated elsewhere, but the cost is simply uncontrollable.

Take the simplest kitchen knife as an example, the price of the most common kitchen knife produced here is one-fifth of the price produced in other regions, and this has more than 70% gross profit. But even if people sell it to five times it, the gross profit is only half ten, purely to earn a living expenses, but even so, the product quality is not as good as one-fifth of people's kitchen knives.

The rest are textiles, light industrial products, and processed foods, all of which come with high technological costs, and are the kind of things that you can't learn if you want to, can't produce them, and sell them at a loss.

And just when Brother Zhang was planning to break ground on the fertilizer plant, Zhao Zhen's birthday finally arrived.

Although there is no grand wedding, the key is that Brother Zhang married his daughter genuinely, even if he can't return to Beijing at will to avoid suspicion, but the gift still has to be prepared.

People, send big jade carving, send thousand-year-old ginseng, send red coral, send gold embroidery, Brother Zhang sent a car.

Completely hand-built cars, although not really modern cars, are arguably the brightest jewels in the industrial crown of this era.

First of all, it is the stamping process and casting process, which is the peak level for people in this era, simply put, this car can not be bulletproof I don't know, but it must be able to prevent bows and arrows, coke special combustion chamber with high sealing circulation boiler, a tank of water and a trunk of coke can run at a speed of 50 kilometers per hour for nearly six hours, enough to run a round trip from Lin'an to Yuhang.

Then there is the configuration inside, this should be regarded as the first car, set up four seats all leather and installed with a fan and equipped with quite a stylish shape, after all, it is something that Brother Zhang personally rubbed out, the sense of design can be said to be full, and because the steam unit he designed is very advanced, the insulation facilities are very in place, so even if you sit inside, you can't feel the heat from the boiler.

Finally, the shock is absorbed, because there is no rubber, so you can only use the skin method to make tires, and the suspension of the vehicle is particularly important, but what a problem solving expert Brother Zhang is, he has created a suspension system comparable to a rally car, no matter how bumpy the outside, as long as it is not a very obvious unevenness or pothole.

And this has not gone beyond the incomprehensible category until now, after all, it is not a new thing that Yuhang has an iron bull, but there is a gramophone on it.

That's right, it's a gramophone, the kind that can make a sound, a gramophone that can sing as long as you put the disc in it, when the disc rotates, there will be some small songs that have been particularly popular in Yuhang recently, and the sound is particularly retro with a little noise, but this is a product beyond the imagination of the times.

The car was delivered three days before Zhao Zhen's birthday, after a demonstration by the engineer and driver who went with the car, Zhao Zhen will sit in the car parked in the palace every night after work these days, let the driver turn on the small fan and the lights on the car, listen to a small song, be in a daze, read a book, and taste a few sips of Longjing tea that has just come down this year.

The time in the car made him very comfortable, and even he fell in love with this feeling a little, and he felt that only when no one sat in the car at night could he really find the feeling of being himself, even if he had been an emperor all his life, there was not a day when he could have such a comfortable feeling.

Zhao Zhen is actually a very generous person, most of the gifts given to him, he has passed on to his ministers, but he is not willing to give this car, and he doesn't know whether he is nostalgic for the tactful little song or the starry sky in the palace late at night.

If he comes, he will let the driver drive him around a few times, but he usually won't leave the palace, because Zhao Zhen I is low-key, he doesn't want to disturb the people, but he has an addiction in his heart.

On the day of the birthday banquet, Brother Zhang didn't come, but Zhao Rong came back, after all, what she said as a daughter on her father's birthday was also to come back to fulfill her filial piety, she could feel that her father was very happy today, and his face was red when he drank wine, you must know that he was very restrained in the past, and there would never be such a scene.

However, there is also a strange thing today, that is, the prince did not come, saying that he was sick and was in bed, but Zhao Rong didn't think so, because according to what Zhao Ji said, His Royal Highness the prince's plan has entered the final stage, and today's non-attendance may be a signal.

And this time when she came back, Zhao Rong brought the newly trained 3,000 elite soldiers to the palace according to Brother Zhang's instructions, she didn't tell her father too much, but Zhao Zhen didn't seem to care, but she still ordered the prince, that is, the old eunuch he trusted the most, to issue the strictest gag order in history, the kind that really kills.

During the banquet, the prince and princess of Liao were also present, and the cause of the Yelu family was not bad, the prince Yelujun and the princess Yelutri looked dignified, if Brother Zhang did not appear, Zhao Rong's husband was likely to be this Yelujun.

And the things they offered were thousand-year-old ginseng from Changbai Mountain and a pair of top-grade deer antler velvets, which were also sincere.

During the banquet, Yelutri also deliberately found Zhao Rong to play, Zhao Rong was three years older than her, and the two had known each other for a long time, and she also deliberately named herself Xiao Rong in order to be close to the Zhao family's sister.

At that time, although the relationship between Song and Liao was also very tense, they were still children, and they could naturally talk together when they met each other, but now that ten years have passed, the two were somewhat emotional when they met again.

"Sister Zhao, I heard that you are married." Yelutri belonged to the typical kind of girl who was a little eccentric, she hugged Zhao Rong's arm and asked, "Tell me, tell me if it's fun to get married?" My father also said a few days ago that I should get married, but I didn't want to marry, so I came to you with my brother. ”

"If you choose the wrong person, you are in purgatory."

"Then did the Zhao family sister find the right person?"

Zhao Rong laughed, holding her chin with one hand and thinking about her straight husband with an alloy slug, she couldn't help but laugh out loud: "He's not good at words, but he can always give people some little joy." ”

"Wow...... That's nice. Yerutri said and leaned into Zhao Rong's ear and said, "In a few days, my brother and I will go to my brother-in-law's side, I want to see it with my own eyes." ”

"Okay, I'll show you around my place then."

"But Sister Zhao, how did I hear that he is still a seven-grade county commander, isn't this horse an official, even if he wants to be an official, why is he still such a small official."

After hearing this, Zhao Rong giggled with laughter, held Yelutri's hand and said, "Don't talk nonsense, something will happen if you say it." ”

And when the two of them were chatting about their aunt and concubine, Ye Lujun stepped forward with a wine glass, came to Zhao Rong and said with a smile: "Sister Zhao, I haven't seen you for a long time." ”

Yelujun was born in 1058, Zhao Rong was born in 1056, the difference between the two is two years old, looking at the Yelujun who followed his ass to fish and play in the imperial garden has now grown into a handsome guy, Zhao Rong can't help but sigh that time flies.

But just when they were reminiscing, there was a sudden commotion outside the palace wall, and then there was a sound of gongs and drums in the palace, and then the guards rushed over to escort the already drunk Zhao Zhen back to the dormitory, and there was even more chaos around.

"Sister Zhao...... What's going on? ”

At this time, I heard that someone outside the palace wall was already talking about something like asking the official family to abdicate, and everyone present understood that this was actually someone who launched a military admonition.

At this moment, the commander of the palace internal guard had already climbed the city wall, pointed down and shouted: "Xiang Huairen, you eat the king's fortune but are not loyal to the king, and you take advantage of the official's birthday to try to rebel, you are really a good courtier." ”

"General Hong, as the old saying goes, those who know the times are Junjie! I advise you to open the palace gate, and today I will wait to come just to implore the official family to abdicate and retire for the rest of their lives, and there is no malice. ”

"Nonsense!" The commander of the internal guard raised his hand, and the soldiers behind him raised their bows and arrows one after another: "Soldiers, don't let the thief take half a step forward!" ”

An arrow was fired, and one of the soldiers fell to the ground, and the next siege battle began.

And Zhao Rong got up and was about to walk towards the palace wall, but Ye Lujun blocked her way: "Sister Zhao, you are a woman...... Don't be reckless, let's go and dodge for a while. ”

Zhao Rong just smiled and patted him on the shoulder: "Look at my sister." ”

After speaking, Zhao Rong climbed the palace wall, took out a long cylindrical thing from her arms, and pulled it hard, and a light rushed into the sky, and then the three thousand soldiers she brought rushed out with the things and came to the city wall and entered the state of combat readiness.

"General Zou."

The general at the head was surnamed Zou, and Zhao Rong stepped forward to greet him, and glanced back at the thirty things covered in red cloth that they had carried up from below.

"Your Highness the Princess." General Zou arched his hand: "It's all ready." ”

Zhao Rong nodded: "Let's start." ”

At the sound of the order, the red cloth was lifted, and then it revealed a strange appearance, a thick cylinder, with something like a crank behind it, and next to it were several soldiers who brought several large boxes from below and placed them beside them, and took out rows of small iron pillars from inside and inserted them into this thing.

At this time, General Zou walked to the front and shouted down: "The imperial grandson has an order, no one is allowed to approach the imperial city, and those who violate the order will be killed!" ”

But he was greeted only by a crossbow bolt that was shot at the door in front of him.