On the third watch, Qin An squinted and lazily walked out of the room, and saw Yueshan watering the flowers and plants. Pen & Fun & Pavilion www.biquge.info

"Yueshan, good afternoon!" Qin An greeted with a smile on his face.

"Hmph-" Yueshan snorted coldly in his nose, and immediately turned his head away, as if he had seen a fly.

Qin An's face stiffened for a while, and he touched his chin helplessly, was he so untreated by her?

After hurriedly eating lunch, Qin An called Steward Tian over.

"Young Master, what do you have to tell me?" Steward Tian said respectfully.

Qin An took out a blank piece of paper from his arms and said, "I'm going to build a biogas digester!"

"Biogas digester?" Steward Tian was a little puzzled, he had lived for decades and had never heard of what a biogas digester was?

Qin An patiently explained to Tian Steward: "The biogas digester is to create an anaerobic environment, and then ferment the organic waste at a certain temperature, humidity, pH, and biogas fertilizer ......."

Qin An talked about all the basic knowledge of biogas fertilizer, but Steward Tian was still confused by this, at first he was confused by the three words "biogas digester", but later, the series of fresh terms in Qin An's mouth completely stunned Steward Tian.

"In short, the biogas digester is very important, it is directly related to the success of spring ploughing, so it must be built!"

Tian Steward took the design drawing, took a rough look, and found that the biogas digester was not complicated, a circular cavity, and then three mouths, and marked the inlet, outlet and exhaust port respectively on the design drawing.

"Young master, don't worry, I promise to complete the task!" Steward Tian patted his chest and reassured.

Steward Tian's loyalty to Qin An is undoubted, if it was before, Steward Tian still had some doubts about Qin An's decision, but the intelligence that Qin An has shown these days has completely put him at ease.

"In addition, you have to pay more attention to the construction of the seafood workshop, and strive to complete it as soon as possible!" Qin An thought for a while and continued to command.

Since he plans to mass-produce seafood seasoning packets, he will definitely not be able to keep himself busy with Frost and his own escort team, and it is imperative to build a seafood workshop.

According to Qin An's plan, the seafood workshop mainly recruited women from Xipingpo to liberate women's productivity. In this way, the human resources of Xipingpo can be used as much as possible without hindering spring ploughing.

Steward Tian thought for a while and said: "It's not difficult to build a seafood workshop, the address has been chosen, but if you want to recruit female workers, I'm afraid it's not an easy task!"

Men farming and women weaving, the family model of male dominance and female dominance has long been integrated into the bones of the people, and it is definitely a huge challenge to want women to show their heads.

Qin An was relieved: "Lao Tian, don't worry, with enough benefits, not to mention that women show up, even if they kill people and set fires, there are people who do it, are you afraid that you can't find female workers." ”

The liberation of women's productive forces is the trend of the times and the wheel of history, and no one can stop it. And he just gently tossed the wheel of history.

After Steward Tian left, Qin An began to ponder his spring plowing plan. Spring ploughing is undoubtedly the most important event of the year, and it is absolutely not allowed to be sloppy.

Qin An's mind was full of ideas, and he naturally hoped to make some fuss about spring ploughing.

Once on Zhihu, Qin An saw a very interesting question: Throughout the history of thousands of years, why has science and technology only taken a qualitative leap in the past one or two hundred years, telephones, planes, trains, so what were the people doing before?

Among them, the answer with the highest vote made Qin An very profound: the previous people went to farm.

That's right, the reason why the development of science and technology in ancient times was slow was because almost everyone went to farm, and there was no excess productivity to invest in science and technology, art, services and other industries, and science and technology naturally developed slowly.

In the Han Dynasty in ancient China, although the land was fertile, the grain yield per mu was less than 300 catties, which meant that only nine peasants could feed an idler, that is, only one-tenth of the population could develop science and technology.

But in fact, most of the idle tenths of the population are nobles, officials, royalty, and maids who serve them, and they don't know how to develop technology at all.

So, why was the development of technology so slow in ancient times? Because no one was engaged in the development of technology.

In the past few hundred years, science and technology have been able to make qualitative leaps, fundamentally speaking, due to the liberation of the productive forces. Due to the large-scale use of chemical fertilizers, the grain yield per mu has increased substantially, and a large amount of agricultural productivity has been liberated.

Under the means of chemical fertilizers, pesticides, agricultural machinery, breeding, etc., the population of farmers in the developed agricultural areas of Europe and the United States is less than 2%, which means that a farmer can feed 50 idlers.

It is precisely because of such a large number of non-agricultural people that the society is so developed and science and technology have made a qualitative leap.

From God's point of view, Qin An is familiar with the history of the development of the earth and knows that the liberation of agricultural productivity is the foundation of all industrialization, so he puts the liberation of agricultural productivity in the first place.

Fertilizers, pesticides, agricultural machinery, breeding...... Among these methods, the first one that Qin An paid attention to was chemical fertilizer. Chemical fertilizer can not only greatly increase the yield of grain per mu, but also the difficulty of production is the lowest among all means.

At first, Qin An hoped to follow the example of the German chemist Haber and make nitrogen fertilizer through the Haber ammonia synthesis method, but he soon encountered an unsolvable problem.

The raw materials of the Haberammonia synthesis method are nitrogen and hydrogen, nitrogen is easy to obtain, and the content in the air is 78%, but it is difficult to get hydrogen Qin'an.

The most common method of producing hydrogen in industry is the electrolysis of salt water, and the principle is very simple, and students who have studied junior high school chemistry are very clear.

However, it is easy to say, but it is difficult to do.

Because, he has no electricity!

If you want to have electricity, you need to have a generator. To make a generator, you need to have a complete industrial system. To build a complete industrial system, it is necessary to industrialize first. If we want to promote industrialization, we must first liberate the productive forces.

And then...... Everything has come back to square one.

After careful consideration, Qin An abandoned the idea of industrial nitrogen fertilizer and chose to climb the tech tree of the biogas digester instead.

Biogas digesters are easy to build and are everywhere in the countryside to produce not only biogas fertilizer, but also biogas, killing two birds with one stone.

The only thing to be solved is the problem of raw materials, after all, straw is easy to find, but manure is not easy to deal with. It wasn't until he saw the scene in the Hundred Beast Garden that he had a flash of inspiration and hit the idea on the beast dung.

The various horses and beasts raised in the Hundred Beast Garden are all descendants of spirit beasts. The effect of biogas fertilizer fermented from its manure is bound to be better than that of ordinary biogas fertilizer.