Tang Yi proposed that the two countries build embassies and permanent envoys, and Zhao Zhen pondered that it was really feasible. It is still debatable that the pen and the www.biquge.info court will not announce the decree without explaining it first, but the cost of the mission alone can save a lot of money.

You must know that when the Liao envoy came to the Song Dynasty, the cost of reception was not low, and everything was rationed according to the highest specifications. Even if the finances are tight, you have to reluctantly pretend to be big, and you can't lose face in front of the Liao Dynasty.

Moreover, if the Liao envoy came once, the Great Song Dynasty had to pay a return visit, which was more expensive. What kind of celestial court ceremonies, accompanying officials and soldiers, all aspects, have to ask for money.

If you really have an envoy, you only need to send a message, how much money will you have to save!

Zhao Zhenxin said that Tang Zihao's crooked ideas are many, and sometimes they can really be of great use.

Tang Yi looked at Zhao Zhen's eyebrows, and knew that this level had passed, as long as the emperor didn't fight the idea of Guanlan Shanghe, everything was easy to say!

Seeing that it was not too early, Tang Yi bowed down and asked to retreat.

No, Zhao Zhen didn't plan to let him go like this, the matter hasn't been finished yet, what are you leaving?

"Da Lang, stay here!"

Tang Yi scolded his mother in his heart, grandma's, Lao Tzu has hollowed out all the family resources, what do you want to do?

"Your Majesty, what else is going on?"

"Uh...."

Well, Zhao Zhen was a little embarrassed at this time, he had just squeezed out a million yuan from others, and he wanted Tang Yi to bleed, which was indeed a bit unreasonable.

"Your Majesty, but it doesn't hurt to say it!"

Tang Yi is also a single, anyway, Lao Tzu has been squeezed dry by you, and he is not afraid that you will mention anything excessive.

"I want to.... Tell me about the biogas lamp and stove thing....."

When Tang Yi heard this, he almost didn't cry, "Your Majesty doesn't want the grass people to let that set of technology for public use, right?" ”

"....." Zhao Zhen blushed, and he really meant that...

As soon as he opened his mouth, Tang Yi fully understood that this matter was not only Zhao Zhen, in fact, Fan Zhongyan had already told him several times. The emperor and Fan Zhongyan were not so concerned about the purpose of lighting and cooking the digester, but rather the fertilizer accumulation capacity of the digester.

A biogas digester can accumulate more than 1,000 catties of wet fertilizer every year, which is an extremely terrible number. According to the calculation of about five acres of fields per household of ordinary farmers in the Great Song Dynasty, more than 200 catties of fertilizer can be increased per mu.

In this era when breeding, fertilizer, and planting are not up to the scientific standards of later generations, more fertilizer means higher yields!

In the past two years, Fan Zhongyan has deliberately experimented with two fields, used biogas digester fertilizer and useless ones, and the difference in grain yield per mu is at least one and a half. Coupled with a set of scientific fertilization methods summed up by Tang Yi, the yield per mu is poor to 20%.

This is more important than anything else, the so-called people take food as the sky, if the technology of this biogas digester is popularized to the whole Song Dynasty, then more than two percent of the grain in two years, what will be the concept?

Therefore, Fan Zhongyan not only gave Zhao Zhen a few pieces in a row, but also talked to Tang Yi many times, hoping that he would give up the business of biogas lamps and popularize this biogas digester.

...

How could Tang Yi not know the importance of fertilizer accumulation to agriculture? Moreover, he knows Zhao Zhen and Fan Zhongyan more thoroughly.

Fundamentally speaking, the Great Song Dynasty was still an agrarian society based on agriculture and supplemented by commerce.

Therefore, what do you want to make the Great Song Dynasty look like, and if you want the Great Song Dynasty to jump out of the primitive economy and advance to a higher social form, the key is not how big Tang Yi can do business, the key is how much arable land the Great Song Dynasty has, how much grain can be produced in the field, and how many people can be fed by these grains.

Only with more basic output can a greater economic force be formed and push the Great Song Dynasty forward.

If the output of cultivated land can't keep up with population growth, then even if Tang Yi plays flowers, it's useless!

Tang Yi once read a source in later generations, saying that in ancient China, even if all the cultivated land was used, because of the relationship between grain and fertility, the upper limit of the population was at most 100 million.

In other words, this land of China can support 100 million people at most. Moreover, this is a theoretical figure, and the real situation is that if the population exceeds 50 million, it is easy to have problems.

It's like a family, the cultivated land is fixed, raising three people is considered rich, raising five people is considered to be maintainable, raising seven people will be hungry, and raising ten people will definitely die!

There is a limit to the load of the land, and even those who can run a family can not play it.

During the reign of Emperor Xuanzong of the Tang Dynasty, there were 1.4 billion mu of land in Greater China and 53 million people in the Greater China region, which had already crossed this warning line.

Then, after the baptism of five generations, the land of Yanyun was lost, and the population and cultivated land of the Tang Dynasty did not recover to the end of the Song Dynasty.

In the Ming Dynasty, because of the introduction of high-yield crops such as potatoes, red departments, and corn, the theoretical upper limit was raised to 200 million. And it is already a miracle that Daming used 300 million mu of land to feed a population of about 120 million.

At the end of the Qing Dynasty, the total amount of land quadrupled, and the population also pushed to 40,000!

It was only with the advent of synthetic urea and hybrid rice that the population began to soar without being limited by land.

Therefore, Tang Yi knows that increasing production is not only as simple as more grain, but also the most fundamental problem.

Although he studied chemistry, it was impossible to synthesize urea in this era, and he could not go to South America to get back those high-yield crops, what should he do? Yield can only be increased under existing conditions, and biogas digester accumulation is undoubtedly the best choice.

However, it is really not Tang Yi who is holding on to this business for some personal interests. If he wants to make money, he has a hundred ways to earn more than a biogas lamp, and the key is that the technology is not mature.

"Don't hide it from Your Majesty, even if the technology and cost of the biogas digester are released by the grass people, they can't be popularized to the people's homes, and the cost is too high."

"Listening to Fan Gong, didn't Da Lang make a lot of profits here? I also thought that this was like a drunken fairy, a business without capital. ”

Tang Yi was speechless for a while.

Lao Tzu is a man, not a god!

"Let's tell you the truth, the business of biogas lamps has been in operation since two years ago, and now, it has made a profit of no less than 100,000 yuan! But do you know how much money grass farmers have invested in technological improvement and research and development? ”

"How much?"

"One hundred and thirty thousand! A year ago, not only did he not earn a penny, but he lost more than 10,000 yuan. ”

“！！！”

"If Your Majesty doesn't believe it, the grass people can ask Uncle Guo to bring the accounts to Your Majesty."

Tang Yi didn't lie at all, he lent out a million yuan, and he was still missing this thing? It is really not suitable for private popularization of biogas digester technology.

When it was first established two years ago, the cost was about 100 yuan, and who could get 100 yuan from the hard-working farmers?

Even now, Tang Yi has invested heavily in research and development, and a large number of top craftsmen have almost broken their heads in order to simplify the process and choose the cheapest and most suitable materials, and the cost can only be reduced to 30 per set.

Thirty times! Equivalent to the price of a ploughing cow, how many can afford it?

...... (To be continued.) )