Nitrogen fertilizer and potash fertilizer are relatively easy to obtain, many places in the Black Iron City have been found by prospecting experts, although the scale is not large, but the quantity is not small, for the agricultural demand of the Black Iron City is enough to supply, and because of this, the most important problem now is how to ensure that these ores can directly produce fertilizer, which is the most important, and for the composition of the land, these need to be very strict professional confirmation, and this is the need to be able to do things.

It is naturally impossible for ordinary people to do it, and Black Iron City has a large number of agricultural experts, but their inheritance itself has been problematic, like modern times, directly extracting soil for measurement, this step is obviously not going to work, what they can go is to confirm what mineral elements these plants lack now according to the growth state of the plants on the land, so that they can only roughly estimate, but they cannot directly determine the proportion of ingredients required, but even so, It is also enough to raise the agricultural production of Black Iron City to a higher level.

But at the same time, how to carry out the production and quantitative output of fertilizer, this is still a big problem, after all, these ores can not be directly practical, the dose is inevitably a little too large, when the fertilizer is overused, it is also not a good thing for the land, so how to dilute and purify, these are very important industrial means, chemists and agriculturists need to study, but fortunately, they do not have to be like the people of the old times, step by step to explore the unknown, in the vast books of the Black Iron CityThere are quite a few books on agriculture, which are the most in this regard.

Because in the past life, many farmers in the process of farming, the state will also provide help, so that they can plant the most suitable crops on this land, China has always had the people's food as the sky, people-oriented thinking, so for agriculture, has always been very important, under the influence of this thinking, the peasants' affairs are naturally crucial, is the key issue that determines whether so many people in China can be self-sufficient in food.

Among the farmers, some people are too old to be familiar with the Internet, and they are not able to use electronic devices proficiently, and because of this, most of the agricultural books are paper, which is naturally outdated in modern times, and even a rather environmentally damaging technology, but for people in the dark ages, these books have undoubtedly helped them a lot, which describes in great detail how to judge the demand for fertilizer on the land where crops are planted through the growth of crops. As well as the most basic steps of extracting fertilizer raw materials from ores, experts only need to follow the above direction to perfectly reproduce it, and do not need to be like flies as before, and do not know what to do with it.

This is the advantage of occupying the city, the books of these cities will be fused with the books of the Black Iron City, so that the original defects will be gradually filled, the Black Iron City has been upgraded a grade compared to the past in agriculture and steel smelting, before that, the Black Iron City also has this technology, but because of more than three hundred years, the age has made the books that have survived in the Black Iron City, many of them have been damaged, and more than one-third or even more than half of the content of a book has become waste, In such a situation, no matter how hard the experts tried, it was impossible to restore the books.

However, the libraries of Picheng and Foothill City now have just completed these materials, so that the Black Iron City can research and produce fertilizers, which is undoubtedly very important, which is why Liu Sanyi wants to occupy the city, not only because there are a large number of industrial population and industrial resources in the city, but more importantly, these cities are often able to better preserve the knowledge inherited from the pastoral era.

In addition to the Black Iron City, the Guangyuan Kingdom and the Holy Alliance are also developing, and the speed is faster than the Black Iron City, after all, the number of cities they occupy is more, and the knowledge in them is naturally more, if it weren't for their rule being too brutal, so they can only get knowledge, it is difficult to get the support of those intellectuals, otherwise they would have already caught up with the Black Iron City in science and technology and trampled the Black Iron City under their feet.

In this regard, the practice of the Holy Alliance and the Guangyuan Kingdom is undoubtedly problematic, conquering by force, but not being able to govern by force all the time, and at the same time, in order to consolidate the core of their own rights, within their own power, to promote the racial system in order to guarantee the inherent rights of their own cities, and to make the newly conquered cities useless, knowing only exploitation and not giving anything, this bad relationship will naturally arouse the anger of the intellectuals, and their silence and non-cooperation, Let those low-hanging fruit knowledge naturally not be used in it, the Holy Alliance can only rely on its own experts and scholars to study the hundreds of thousands of books, this speed is naturally slow, not to mention that there is also a Shu Han in Black Iron City, who has personally lived in modern society, and knows a little bit about the development of science and technology and frontiers, which is useless in modern times, it is nothing more than one more talking point, but in this era, Shu Han can help Du Erxin and others eliminate some unnecessary side details, The ability to focus only on the most important areas is something that the Holy Alliance does not possess.

As for the Guangyuan Kingdom, although the rule is not as cruel as the Holy Alliance, the terrain of the Guangyuan Kingdom is not particularly good, it is located in hilly and mountainous areas, and most of the cities are between these hills and hills. However, their collection of books from the Pastoral Era is only more than 100,000 volumes, which is less than the 200,000 books that Black Iron City has now, but their scientific research talents are the most abundant and relatively united, and it is precisely because of this that in terms of science and technology, Guangyuan Kingdom has not lagged behind the Holy Alliance.

But even if the Holy Alliance can't unite the intellectuals of the entire country, with their own strong strength and a large number of books, they have indeed used the intellectuals in the past few years to separate the hundreds of thousands of books that were originally scattered into volumes, so that experts can read them more conveniently, and at the same time restore some very dilapidated and ancient books, and at the same time arrange for people to copy these books to ensure the survival of these knowledge, and at the same time revive ancient technology. 360 Literature Network

In the past few years, the Holy Alliance has also been developing the smelting industry, engineering technology and electricity, etc., obviously, they are not fools, naturally they know where the future direction is, which also makes the Black Iron City have a very tense pressure, originally thought that the end of the war, the signing of the peace agreement has allowed the Black Iron City to stay out of the matter, but it turns out that if the strength cannot keep up, then the Black Iron City will become a colony of one of the two countries and become a subsidiary servant. So they don't have a choice, there is only one way, and that is to move forward.

This kind of pressure, Shu Han is undoubtedly clearly aware that the only advantage of Black Iron City is that it is relatively more united than the other two forces, and at the same time, there are natural dangers as an obstacle to ensure the safety of Black Iron City, and the other is himself, the drawings left by Su Yu for himself are clear and complete, and they are definitely more effective than those books obtained by the Holy Alliance, but now he doesn't dare to take them all out, he needs to rely on these drawings to climb to a higher position, but if he takes it out now, It will be difficult for him to gain any more power, as he is now in the highest position that an ordinary person can hold in Black Iron City, and all the power and responsibility beyond that belong to Skywalker.

Only by becoming a Skywalker and handing over these things can he gain a greater right to speak, and be able to lead the actions of Black Iron City, so as to lay the foundation for his search for the truth, which also makes Shu Han very anxious about his breakthrough, but there has been no change from beginning to end, but his height and weight have increased dramatically, the food list provided by Zhao Qingtian and the comfortable life he lived after being rich made Shu Han start to grow wildly at the age of nineteen, and now he is about one meter eighty-two tall, at this point, has surpassed the vast majority of ordinary people, and the weight has also reached seventy-eight kilograms, these are not fat, but muscles, a lot of exercise every day, so that today's Shu Han is completely different from the image of a few years ago.

If the friends in the mine saw Shu Han today, they would definitely wonder if the two were the same person, not to mention the temperament is just appearance and height, the body shape is already completely two appearances, three years ago he was still a 1.6 meter dwarf, and now he is already a young man, in this regard, it can be said that Shu Han has suffered a lot, in order to increase his strength, he forces himself to accept a lot of exercise every day, and at the same time strictly controls the diet, completely according to Zhao Qingtian's statement, Rejecting a lot of greasy and meaty stuff has allowed him to make such a huge change in just three years.

At the same time, he can also feel that the power in his body is slowly condensing, and his strength is gradually breaking through, but the breakthrough has not come for a long time, which makes Shu Han feel a little frustrated in his heart, in this regard, Zhao Qingtian has no choice, after all, in addition to Neidan, if he wants to awaken his talent, this is completely a matter of providence, if Zhao Qingtian can let Shu Han make a breakthrough accurately, then he will not be swept away by the hospital, and he can become the ruler of Black Iron City by virtue of this, It is not impossible to even become a god for all mankind.

After all, compared to Skywalker, the strength of ordinary people is too weak, especially in the face of some treacherous Skywalkers, even a musket team, can not cause the slightest damage to the enemy, in many battles, the originally smooth war will be declared a failure because of Skywalker's turmoil, it can be said that to many extent, Skywalker and other humans are already two species, the reason why it is not separated now, just because emotionally, Skywalkers don't consider themselves from other races yet, that's all.

If Zhao Qingtian masters the way to turn humans into Skywalkers, then he will become the savior of all mankind, why do they need to worry about it anymore, they can completely reoccupy the earth, and then create a more brilliant human civilization.

So Zhao Qingtian can't do anything about it, but this also arouses Zhao Qingtian's interest, as a doctor, he naturally knows that Skywalker is from ordinary people, and how ordinary people become Skywalker is a secret that countless doctors want to unravel, but unfortunately, the appearance of Skywalker does not rely on genes, nor on any other external force, it seems that his awakening is completely dependent on luck, so although doctors have done a lot of experiments, they often end in failure, Either none of the samples became Skywalkers, or they became Skywalkers without them noticing, or they were limited by the backwardness of the equipment, making it difficult for doctors to observe.

So far, how ordinary people become Skywalkers, no doctor can answer, but this question has always made doctors tirelessly explore, Zhao Qingtian is naturally too, as a doctor, of course he wants to unlock the secrets, not only to save mankind, but more importantly, as a doctor, the understanding of human flesh is far more than other people, and what is the transformation between Skywalker and ordinary people, this is really very interesting.

After all, when an ordinary person becomes a Skywalker, his body will undergo strong changes, and some body bones will even be alienated, that is, the strange development of bones, if this is placed on ordinary people, this person would have died a long time ago, but the mutation of Skywalkers has made human beings stronger, and it has not harmed the human body itself, and some have evolved new organs, stored fuel, or improved eyesight countless times, etc., these evolutions are completely mindless, Sudden and huge changes in an organ or a part, this strong contrast, as well as the source of strength, has been obsessed with doctors for hundreds of years, and Zhao Qingtian is naturally the same, so he is more and more concerned about Shu Han, and almost every week he will conduct blood tests and so on to observe Shu Han's physical condition, in this regard, Shu Han is quite uncomfortable, always feeling that he is now the food in Zhao Qingtian's mouth and the object of the other party's research, this idea makes Shu Han shudder, Fortunately, Zhao Qingtian only stayed at the most basic exploration, and did not do anything other dangerous to Shu Han.