The melting point of crystal ore is more than 1700 degrees, while the temperature of ordinary firewood and charcoal is only about 1,000 degrees, even if it is coal, it is difficult to reach 1700 degrees, so if you want to refine crystal, you must first get coking coal with a temperature of 2300 degrees.

There are not many places to produce coal in Guanzhong, and due to technical reasons, mining non-open-pit coal mines during this period requires a lot of manpower and material resources, and the investment is very huge.

Sun Xiangfu knows that once this coal business is started, the profits in it will be very large, and the impact will be great. You must know that at least tens of thousands of households in Guanzhong now rely on collecting firewood and charcoal to help supplement their families, and if they can't solve the problem of feeding these people, he rashly came up with a coal industry, which may harm these tens of thousands of people.

However, business matters are not easy to discuss on the ship, and it is necessary to negotiate and plan after on-site surveys, so Sun Xiangfu only expressed an intention with Uncle Wei, after all, in addition to cooperating with the emperor and the seven sects and five surnames, Sun Xiangfu can only choose to cooperate with the Guan Long family, and this thing can be done.

Like Qin Qiong, Cheng Biting Jin, and Wei Chigong, these newly rising nobles, that is, there are only some fields around Chang'an, unlike the Guanlong family, there is less of a county's territory, and more, even half a state, or even a state, Hongnong Yang is an example, the entire Hongnong County, if you want to do big things, you can't do a second thought, Li Shimin has to accept their Yang family daughter as a concubine, in order to get their support.

With heavy cargo, the fleet is slow, although the happiness can not be affected by the monsoon and the reverse current, but there are two Qincha on the ship, can not throw off the big team to go alone, so, slowly walked for more than ten days, the fleet arrived in Yangzhou, and at this time, the land of Guanzhong, is in the autumn harvest.

Early in the morning, a team of flying horses rushed to Huangzhuang in Lantian County, where there was a piece of land cultivated by Li Shimin in the spring, and he specially asked people to make a mark, saying that he would come over to see the yield after the autumn harvest, and he did not forget about it.

To do a show, you have to do a full set, and after teaching the prince and several princes to sow seeds, they naturally have to teach them to harvest, so today Li Shimin is not alone, but also the prince, Li Ke, King of Wu, Li Tai, King of Pu, Li You, King of Qi, and Li Su, King of Liang.

"Father, this is this field, Erchen remembers, you see, the wheat here is taller and stronger than the field next to it, and the ears of wheat are full." Li Chengqian was more concerned about things related to Sun Xiangfu, and when he walked to the field, he pointed to the wheat in the field and said, of course, these words were taught to him by the eldest grandson Chong a long time ago.

"Well, I know, you five brothers, let's harvest these acres of wheat today!" Li Shimin nodded casually when he heard this.

Sickle to cut wheat stubble, this thing is really not technically difficult, children can do it, but it is a little difficult to cut a few acres of land, it is a little difficult for these children, Li Chengqian is the oldest, at first I didn't feel it, after cutting a few handfuls, I felt that my waist was not good, and I wanted to complain, but Li Shimin, who was standing on the ridge, was discussing things with the eldest grandson Wuji and Xiao Yu, Wei Zheng and others, and he was not easy to interrupt.

Of course, there are even more unbearable than him, the youngest Li You and Li Su, cut a few times indiscriminately, then sat in the field with a sickle to chase and kill the reptiles in the field, and the servants who served them saw this scene, so they looked for a vacancy Li Shimin said, "Your Majesty, the prince and several princes are still young, and they can't do this rough work, so let's do it for the slaves!" ”

"Hmph, a few guys who have no interest, now know the truth of 'every grain is hard'! Look at it from the sidelines. ”

Li Shimin deliberately wore a tight-fitting suit designed by Sun Xiangfu's ready-to-wear workshop today, there is no need to tie the hem around the waist, nor does he need to tie the big sleeves solidly, it is very convenient to do the work, the eldest grandson Wuji and others are also dressed in the same way, seeing Li Shimin go to the ground, they also came over and bent over to cut wheat.

Their sickles are made of fine iron, and they are very quick to cut, but they are only responsible for cutting down, and as for tidying up, there are naturally slaves and maids in charge, but in half an hour, six acres of wheat fields were cut by several people, and the inner servants have already pinched most of the wheat taxes into granules and piled them up on a piece of hemp cloth.

"Let the wheat produced here be two or three percent more than in other fields." Looking at the half-human-tall wheat piled up, Wei Zheng estimated it.

"But not only that, this year's drought in Guanzhong, the crop yield is not high, the yield per mu of the high-quality fertile land is rarely more than two stones, the middle field is only one and a half stones, the lower field is not a stone, and there are even some lands that are out of harvest, relatively speaking, at least three or four percent higher."

The eldest grandson Wuji is in charge of the household department, and he is clear about the output of farmland in Guanzhong, in fact, he has already said that this year's wheat in Guanzhong has no yield of more than two stones, and the harvest land accounts for at least two or three percent.

"How much is the yield per mu, I will know if I weigh it."

Li Shimin said, there will be a chamberlain to weigh the pole erected, sewn in advance cloth bags, put the wheat into a bag, weigh a bag, and wait for the waiter to pinch all the wheat on the ears of wheat into grains, and basically finish.

"Your Majesty, a total of three thousand one hundred and twenty-seven catties."

"How much?"

"Three thousand one hundred and twenty-seven pounds."

"There are so many? Chen remembered that this seemed to be only six acres of land, didn't it mean that the yield per mu reached four stones? Wei Zheng was a little stunned.

"Wei Qing is not right, it should be more than four stones per mu." Li Chengqian, who was watching the excitement on the sidelines, interjected.

When Wei Zheng heard this, he made a silent calculation in his heart, and it was true that his mental arithmetic was not as accurate as a child, so he immediately handed over to Li Chengqian and said, "The prince is smart, and he is even more proficient in arithmetic than the old minister, and the old minister admires it." ”

Li Chengqian, a child who loves to behave, likes to hear other people's praise the most, and when he heard the words, he smiled and said, "This is nothing, the lonely junior sister Hou Shuya is amazing!" However, it is said that Sun Fu has a more powerful formula, multiplication and division, and they can all recite it backwards. ”

"Hmph, then Sun Zheng was born to be a mercenary person, specializing in this way of arithmetic, with such good study conditions, and he doesn't read more sages and gentlemen." Li Shimin reflexively said that because of the bet, people who lose will not be in a good mood. However, he suddenly remembered the key point that Li Chengqian had just said, turned his head and looked at Li Chengqian again and asked, "How much is the yield per mu?" ”

"Father, it's a little more than four stones and three." Li Chengqian didn't know why Li Shimin suddenly lost his temper, but fortunately he didn't rush at him, so he replied by the way.

"Four stones and three? There are actually four stones and three? Li Shimin was stunned, even in a year when the wind and rain were smooth, it was difficult for the upper fields in Guanzhong to produce three stones of wheat, and this field actually produced four stones and three wheates in a slightly dry year, how could this be possible?

An acre of land yields more than 500 catties of wheat, or just harvested wet weight, in later generations, this is not an achievement at all, the same area of field, in later generations, any farmer can also grow six or seven hundred catties of dry wheat, but this yield is three or four percent higher, but this data for the ancients, is indeed a bit unbelievable, Li Shimin for the first time, the matter of farming, is actually a high-tech work.

"Your Majesty, please inform the people of the world of the planting method of this field, this is the law of God bless my Tang Dynasty prosperity." Figuring out the meaning of this number, Wei Zheng said excitedly.

"Zhang Bang, Zhang Bang, hey, in fact, you don't need to make a list, this planting method, it is written in "Qi Min Yaoshu", I didn't pay attention to this book before." Li Shimin said with some annoyance.

In fact, the book "Qi Min Yaoshu" has a fairly scientific record of the crops suitable for growing in the Central Plains and the method of cultivating the whole field, which is almost the limit of the conditions that can be achieved during this period.

Not only that, but he also has a very comprehensive record of planting trees, raising livestock, poultry, brewing, cooking, etc., all related to agriculture and people's livelihood.

And those who have read this book thoroughly and learned it all, in this era, can definitely make a fortune easily, even the planting technology used by Sun Xiangfu now is generally not much beyond the things recorded in "Qi Min Yaoshu".

Li Shimin is now called a repentance! If at the beginning of the founding of the Tang Dynasty, the people could produce according to the cultivation and breeding methods recorded in the "Qi Min Yaoshu", then the current national strength of the Tang Dynasty would be at least several times higher.

And now, he can explain so much cultivation skills from Sun Xiangfu, it turns out that this guy has learned all the "Qi Min Techniques".

"Qi Min Technique"? After the minister returns, he must read this book carefully. When Wei Zheng heard this, he seemed to remember that there was such a book, but the ancient readers had the idea of chasing the ancients, and felt that the more ancient classics were handed down, the more wise the sayings, so that the books written in modern times were not paid attention to, and there were also reasons why the readers looked down on agricultural books, and the people who could read and understand the "Qi Min Yaoshu" proved that they already had a high level of knowledge, how could they do what they could do like farming, and the arrogance of the scholars did not allow them to do this.

Of course, there is also a problem of information circulation, a book was popularized in this period, unlike the era of the popularization of the Internet and printing in later generations, in the early Tang Dynasty, when engraving printing was not widely used, it often needed to be copied by hand to pass it on one-to-one.

"Qi Min Yaoshu" was written in the last years of the Northern Wei Dynasty, and it has only been a few decades now, so it has not been widely popularized, let alone applied. In fact, in the Song Dynasty, there were more agricultural books based on "Qi Min Yaoshu", and its benefits gradually began to be brought into play, and it was popularized in the Song Dynasty, where the people's literacy rate was high, and the agricultural industry at that time began to gradually change to intensive farming.

Sun Xiangfu used an example to show Li Shimin the benefits of intensive farming, and the first result was that the book "Qi Min's Technique" in Chang'an was almost sold out of print.

No way, in the era when movable type printing was not popular, and most books were still bamboo slips, this kind of long paper books were very rare and expensive, and when everyone was asking for a book, the news could no longer be hidden.

Inougami Erda's dog nose reaction is very sensitive, the purpose of his coming to Datang is to learn all aspects of technology, a kind of practical book that specializes in teaching everyone how to improve the output of the field is very important, how could he not know.

Moreover, now Chang'an is crazy that planting wheat according to the records on this book can double the yield, so that Inugami Ertian is crazy, and he bought a book at the expense of a thousand taels of silver, and he spared no expense to find a lot of people who can write to help him copy the book.

Sun Xiangfu didn't know what happened in Chang'an, and he didn't know that his so-called talent was greatly discounted by Li Shimin, because Li Shimin felt that he was going to batch produce talents like Sun Xiangfu who were proficient in farming.

In the Lizheng Palace, Li Shimin thought about it for a long time before he said to the eldest grandson, "Guanyin, I am ready to knight Sun Zhengming." ”

Hearing this, the eldest grandson was stunned for a moment, and cast an inquiring glance at Li Shimin and said, "Why?" ”

Li Shimin said with the reason he had made up, "The credit for his introduction of rice seeds in the south this time is too great to be suppressed, and I have already found a talent who can replace him in charge of the Huangzhuang." ”

Hearing this, the eldest grandson was a little surprised, and continued to ask, "Who?" ”

"Anyone who is proficient in this book can do it." Li Shimin shook the book "Qi Min Technique" in his hand and said.

The more he read it, the more he realized the beauty of this book, the book that guides the development of people's livelihood is actually not worse than those books that write the principles of life, and he feels that this book should be a must-read book for every local official.