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Human manure cannot be applied directly, otherwise it will damage the crops.

This was common knowledge in later generations, and farmers who cultivated land and vegetables knew it. The manure has to be rotted first, and the decay is a fermentation process, and the fermented manure has no odor, high organic nutrient content, comprehensive nutrition, and does not burn roots and seedlings when applied to the ground.

However, Zhang Chao didn't understand what he told his father, anyway, they all decided that manure could only be used as base fertilizer, and could not be directly applied to crops. What Zhang Chao wants to do now is to change this concept. Then, sell fertilizer to make a lot of money.

"Rotten?" After hearing Zhang Chao's words, he was puzzled, "We used to pile up the pig manure and gasket grass in the pigsty after the circle, but we still can't apply it directly to the crops, otherwise the seedlings will die and the roots will be damaged, and the leaves will not grow yellow if the roots are not burned." ”

"Composting is also a way to rot, but it's too slow and it's not fully rotten."

When manure is applied to the field without decay, it not only burns the roots, but also causes air and insect infestations. The manure that is not fully decomposed slowly ferments and rots in the soil, which will slowly release a lot of harmful gases, which will affect the growth of crops. In addition, manure often contains many parasite eggs, especially in the manure of domestic animals, which can cause insect infestation if it is not fully decomposed.

In the Ming and Qing dynasties, the method of decomposing was not a simple compost and manure, but a pond had to be dug up, and the manure, dust, garbage, chaff, fallen leaves, etc. were piled up, and then sprinkled with soil to cover, and then covered with a wooden cover, and sealed again with soil, so that it could be accelerated to decompose, this method is also called steamed manure.

In the Ming and Qing dynasties, there were also simmering manure, cellar manure, and boiling manure, which were actually to reduce the decomposition time and fully decompose.

In Zhang Chao's view, in fact, by building a biogas digester, all troubles can be solved.

A pair of brothers and sisters endured the stench and took several loads of dung from the manure tank.

"Pick it out of the village, the province stinks to the people."

Zhang Chao took everyone to the outside of the village, chose an open space downwind, and then asked the big cow and the two cows to level the ground a little.

"Spread a layer of stove ash on the ground first."

Every household in the village burns firewood, so the ash of the stove is also the ash of grass and wood, and when the ash is laid, Zhang Chao asked the bolt pillar to spread the thin manure from the manure tank on it, and spread it about one or two inches thick.

The manure in the septic tank has actually been soaked, and it should have been fully soaked, but Zhang Chao is just doing an experiment, so it doesn't matter.

"Alright."

"That's it?"

"This one is okay, let's get the other ones."

"How else do you get it?"

If you want to get it, you have to get an official version, Zhang Chao wants to get a biogas tank. Of course, it's not a complete digester, it's just a similar fermenter.

A large number of people is easy to do, shouting, a group of people with hoes began to excavate, digging a large circular pit, and then leveling the surrounding area, and then laying bricks. Reserve the inlet and outlet in advance, and then start repairing the roof of the pool.

In order to ferment fully, it must be sealed.

The top is also made of bricks, which is difficult for everyone, there are potters. A vault was repaired, air holes were reserved, and bamboo tubes were inserted. Then use yellow mud to smear a thick layer on the outside of the brick to prevent air leakage.

It doesn't need to be as big as a digester, just make sure that no air gets into the bottom after sealing.

However, after fermentation in the sealed pond, a lot of biogas will be generated, and when it accumulates to a certain amount, it will have a lot of pressure, and it will explode if it is not well controlled.

After fermentation, biogas is produced, which can explode if discharged at an untimely time. Zhang Chao installed several air holes on the roof of the pool, which were made of bamboo pipes, and now they are all plugged with wooden plugs.

However, Zhang Chao's plug is not tight, as long as the air pressure in the pool reaches a certain amount, the plug can be pushed out and discharged.

"There can't be an open flame in this pool!"

Zhang Chao once again sternly admonished everyone.

It took half a day's work to make this not too big fermentation tank, the first one, Zhang Chao didn't dare to make it too big, after all, it is very convenient to build a biogas digester in later generations, and many of them are ready-made materials bought directly. And now they are replaced by many clay products, so you have to explore and see it first.

"Pillar, pick up dung!"

"Big cow, second cow, get all the washer grass in the horse pen."

"Plug, carry the water."

Manure, urine, wheat straw, fallen leaves, and grass in the cattle and horse pens were added to the fermentation tank from the inlet, and then a lot of water was poured into it.

It is estimated that the amount is almost over, and Zhang Chao asked people to block all the pores, feeds, and outlets.

"Just wait for the fermentation now." Zhang Chao announced.

Niu Jianhu, who had steamed wine with Zhang Chao in Hebei, looked at this cellar-like fermentation pond and couldn't help muttering, "How can you make a fat, but it's like making wine?" ”

"I think so too."

Mura Zheng felt that Zhang Chao specialized in such a pool of manure, there must be something special, he was quite superstitious about Zhang Chao, and felt that he would definitely succeed.

"San Lang, when will it be okay?"

"Soon."

The pool built by Zhang Chao is very small, about two meters deep, and the pool can hold six or seven cubic meters. If you look at the standard of the biogas digester, although the pond built by Zhang Chao is decent and a round pool, it is actually not up to standard in all aspects, and it will definitely not produce much biogas. But it was useless for Zhang Chao to ask for biogas, so this pond was only used for fermentation, which was completely sufficient.

It won't take long for Zhang Chao to use a pile of garbage, manure, hay, straw, fallen leaves and water to ferment a lot of fertile biogas fertilizer.

In particular, you can also get biogas slurry, which can be used as an insecticide.

However, it is still more troublesome to build this kind of fermentation tank, and the cost is higher. When you really start a manure business in the future, the fermentation tank will definitely be a simpler kind of tank, at most with some wooden boards on it.

After fermentation and rotting in ordinary fermentation tanks, and then with furnace ash, it is okay to replace it with some soil without furnace ash, and it can be made into dung cake, which can become nutritious dry manure cake fertilizer after drying, and it is sold.

And this kind of relatively high-end fermentation tank is made of biogas fertilizer. Biogas manure is more efficient, but there is also a not-so-good area. Biogas manure needs to be used as it comes out, and it can be left for a day at most after it comes out of the pond. Otherwise, over time, many of the fertilizers contained in it will be lost. This is indeed a problem, and if this problem is not solved, then the biogas manure he makes in this biogas tank is not much better than the ordinary manure.

Clapping his hands, Zhang Chao went home to take a shower.

As for the fermentation tank and the piece of dung cake on the field, let it dry first.

In the sauna of the big bathroom in the village, Zhang Chao and Cheng Chumo sat in the wooden house with only a crotch cloth on their faces.

"Come again!"

Niu Jianhu took a stone from the stove with tongs, put it aside, picked up a spoon and scooped up a spoonful of water and poured it slowly, and suddenly a burst of water steam rose, and the hut became even hotter.

Zhang Chao was sweating, but he gritted his teeth to hold on.

Let's see who can't hold it up today.

After steaming for a while, it was Li Gan's turn to clamp the stones, this guy finally couldn't stand it anymore, and the whole person was as red as a boiled shrimp.

"I lost!"

"Hahahaha!" Zhang Chao and the others laughed together, the door of the wooden house opened, and the five guys who couldn't stand it all rushed out, jumping into the cold water pool at the speed of a 100-meter sprint.

The freshly steamed hair was sweat, and it was all washed away at once.

"Come again!" Li Gan soaked in cold water, and the whole person came back to life, as if he was not convinced, and he was the first to admit defeat just now.

Zhang Chaole took the lead and walked into the steam room again, the sauna was supposed to be steamed three times and three showers, how could it be steamed once.

"San Lang, your marriage leave is the last day today, and you have to go back to work tomorrow." Li Gan said with a smile.

"When I am on an errand, I am the biggest when I get to the workshop anyway, and no one can control it." Zhang Chao is still a little worried about Li Shimin's pit of his Baijiu and Baiyao Workshop, and he is not very concerned about building two workshops at all.

He didn't have a penny of benefits, so what did he care, it was better for him to study and study the refinement of this 'dung pill' at home. It's still a big deal.

"San Lang, we don't have any other way, can't we start a new stove for this soju?" Li Gan always felt a little pity.

"Of course not, unless the court can agree, it's just playing with fire." Zhang Chao replied.

Zhang Chao is not as desperate as before when it comes to making money. There are also a lot of properties in the family, although he still owes Qin Qiong 8,000 yuan, but Qin Qiong will not count his interest, and he will always be able to pay it off sooner or later.

Zhang Chao also has no interest in his career.

The fifth year of Wude is about to arrive, but the most dangerous period of the Wude Dynasty has also arrived, and the dispute between the crown prince and the king of Qin will enter the white heat, and Li Yuan will vacillate between the two sons.

The crown prince and King Qin are fighting fiercely, and it is not easy for two people to have accidents, and every time they are unlucky, it will always be the people below. Zhang Chao didn't want to get involved at this time, it was better for the local owner, and no one could control anyone's bowl.

Thinking about it this way, in fact, it's pretty good to hang up an idle official who is a member of the school engineering department now, and if you manage two workshops, you can't mess with anyone.

I was steam in the steam room.

The Zhang family's dinner was very early, and they all ate before it was dark, which was also a habit in the past, two meals a day, one meal in the morning at about eight or nine o'clock, and then one meal in the afternoon before dark. Now Zhang's family has changed to three meals a day, but this meal is still before dark at night.

Dad is not used to lighting the lamp to eat at night, perhaps he has always been used to saving and is reluctant to lamp oil, although in fact, the Zhang family does not lack this now.

In the bedroom, Cui Yingying sat on the kang and was still practicing the abacus.

Zhang Chao walked to the side of the kang and was about to get on the kang, but Cui Yingying stretched out one foot to stop him.

"You can't go to the kang today."

"I washed it several times in the afternoon, and I steamed it three times in the steam room, and I sweated a lot, and the smell was gone." Zhang Chao thought she was talking about making the manure tank stink during the day.

"Have you forgotten what you promised me in the morning?"

"What?"

"Hmph, you're doing it on purpose, or trying to play tricks. Come on to the red line bed, she's going to take a shower, and she'll be here in a moment, and you're hers tonight. ”

Zhang Chao smirked, a little embarrassed.

"You don't think I'm in the way of you here, then I'll sleep with Qiuyue and Dongqing tonight."

"Don't."

"Then you can't go over."

"Okay."

Zhang Chao turned around three times in one step, and saw that Cui Yingying kept lowering her head and pulling the abacus, ignoring him at all.

Walking to the door, Zhang Chao sat on the bed where Hongxian usually slept on. My heart was pounding a little, damn it, in front of my wife, I slept with the mistress, it was so exciting.

Leaning on the bed, Zhang Chao fell asleep unconsciously.

Recommended: "Daming 1629", Daming 1629, turning the tide is about to fall, and the building will fall!

In the decadent late Qing Dynasty of "This Kingdom of Heaven is Not Peaceful", in the ranks of the Taiping Army on the official road outside the city, Feng Yunshan, the southern king in the sedan chair, became Feng Shaoguang! (To be continued.) )