You must know that the land in the greenhouse is deeply turned, and the bottom fertilizer is applied. Loosening the soil and watering are not falling at one time, and the ambient temperature is higher, how can it not grow in an ordinary field!

"Great, this time you are really stumped as a teacher, is it a different seed?" Hong Tao is just a balcony family, he has read some books on planting and manure, and he has more theoretical knowledge than practical experience, and he can't explain this obviously unreasonable thing.

"The seedlings here are all transplanted from the greenhouse, and the teacher didn't say that the plants are too dense and the fruits are less, so the students will do more." Gao Yu disagrees with this explanation, the seeds are all the same, and even the places where the real leaves germinate are the same.

"Wasp, if you go find two pioneers who are good at farming, I won't believe it! By the way, it's invited, if people are busy, they will spend money to hire them, don't ruin the reputation of your family. ”

Seeing Gao Yu's depressed face, Hong Tao's curiosity was also aroused. I still have to spend it today, it doesn't matter if I don't understand, we have people who understand and can ask for advice, and we can't always be professional farmers who can't give accurate answers.

But this time there is no answer, the two old masters found by the wasp looked at the melon seedlings in the two fields, turned over the soil in the field, pinched a little more and put it in the mouth to taste, and then said in unison that the soil in the acres of the field is more fertile, so the melon seedlings will grow so vigorously.

But people also say that the land is too fertile and has no benefit to melons and fruits, and it will cause melon seedlings to grow wildly but do not love the fruit. When to fertilize and how much to apply.

"Adults are really immortals, and the students taught to farm are so exquisite, fortunately, there are not many adult students, otherwise there would be no way for us to live."

However, the two veterans still praised Gao Yu's planting skills, they didn't understand the use of the greenhouse, but they just felt that it must be a stunt to make the melon seedlings sprout so early.

"Hey, I'm grumpy, Wasp, go inform Lian'er and bring the official's lunch, and the official will fight with them today!"

I didn't get a satisfactory answer like this, Hong Tao really couldn't bear it. I am a star monarch, how can I not deal with a few melon seedlings, especially in front of students, this face cannot be embarrassed.

"Gao Yu, you honestly confess, what did you bury in the ground, did you specialize in tricks to toss the teacher? Chen Niang is young, Wang Er and Wang Shi are girls, and some naughty officials can bear it, if you also learn from them, there will be no good fruit to eat! ”

After sitting on the ground and eating lunch, Hong Tao began to explore carefully, and even dug out a few melon seedlings and dug a big pit of more than half a meter in the ground, but still did not find the answer to the fertile land, and he was a little annoyed and angry.

"The students didn't dare, it was still a wasteland half a month ago, and the students just threw away some laboratory garbage. When the few of them came, all the garbage was put into wooden barrels and sent to the coke oven for incineration, and then it was empty......"

Gao Yu felt that he was going to be unlucky, and the explanation of playing with his life was not a prank, and at the same time, he thought about it, and if he didn't understand anything in the future, he would definitely not bother the teacher.

"Waste from the lab...... Tell me what experiments you've been doing lately? "Scrap ...... Fertilizer, the word caught Hong Tao's attention. Could it be that Gao Yu made something new and inadvertently became fertilizer?

This time I guessed correctly, Gao Yu was indeed not idle. The nitroglycerin experiment was unsuccessful, and he turned his attention to the chimneys of the coking kilns. Since the teacher can turn the waste gas of alkali production into hydrochloric acid, he also wants to try his own ability, whether he can use the waste gas of the coking kiln.

To this end, he also had the carpenters build a device similar to a coke barrel, which was placed on the chimney of the coke kiln, and tried to react with various liquids and the coke oven exhaust gas.

Water, sugar water, salt water, alcohol, and sulfuric acid were all tried, and the products obtained were collected one by one. Well, it didn't seem to work. The next step is that he is planning to try it with hydrochloric acid and nitric acid to see if there is any catch.

"Are you sure you dumped all the waste here?" There are many substances in the exhaust gas of the coke oven, and it is impossible to determine the specific type, but when I heard that Gao Yu used sulfuric acid, Hong Tao seemed to be a little eyebrows.

"Sure, this used to be a small pit, and the students strictly followed the teachings of the husband, and every time they dumped the waste liquid, they would bury it with soil, and only turn it over with a hoe when they were cultivating the melon field......" Gao Yu pointed to the middle of the melon and explained to the teacher that he was following the rules for the experiment, and he really didn't foul.

"This is fucking called a fool with a fool's luck, this official is so wise, it's not your shit luck that works, providence! Go and see what you've collected. After listening to Gao Yu's narration, Hong Tao basically determined a possibility, and couldn't help but look up to the sky and sigh at the injustice of fate.

The solution of water, sugar water, and salt water were all excluded by Hong Tao, and the only thing he was interested in was the sulfuric acid solution. A high proportion of the exhaust gas of the coke oven is coke oven gas, and the ammonia content in the gas is very high, and the sulfuric acid can just neutralize the ammonia, and the new substance obtained is called ammonium sulfate.

What is ammonium sulfate, it is a kind of nitrogen fertilizer, which is sold on a treasure in later generations, but it has a different name, called fertilizer field powder, and the main ingredient is ammonium sulfate. This is the only reason why the melon seedlings planted in the field by Gao Yu grow stronger than the carefully served greenhouse melon seedlings.

No matter how good the farm fertilizer and soil fertilizer are, they are not as fast as the real fertilizer in terms of short-term effects. However, the use of ammonium sulfate is limited and cannot be applied for a long time, otherwise the land will acidify the slabs and the yield will be lower and lower.

Gao Yu is really shit lucky, the ammonium sulfate solution he made was very low, and it was spread out by deep turning, just reaching the right level.

If the concentration is higher, these melon seedlings will not only not grow vigorously, but will die because of the shrinking roots, or do not grow at all, which is often called the phenomenon of burning roots.

So does ammonium sulfate work? It must be useful, it is a high-efficiency nitrogen fertilizer, and it is a miracle medicine for farmers who cultivate the land. The problem of land acidification is very easy to solve, and the price of ammonium sulfate is raised, forcing farmers to use it together with agricultural fertilizer and soil fertilizer. It only plays a supplementary role, and the content is not too high, which will not cause land acidification, and can also play a role in increasing yield.

Moreover, ammonium sulfate also has the effect of removing insects and diseases, not on the human body, but on plants. With its addition, it can prevent and treat some agricultural pests and diseases, which is the best choice for high yields in ancient times.

To put it more broadly, to be able to increase the yield per acre by 10 percent is a great harvest for the whole country. It did not increase the number of acres of land and did not occupy more manpower, so it was 10% more grain. From the government and the emperor to the common people, they are all happy.

What was a weapon of the strategic level in ancient times? The first is people, no one does anything ineffective, and they suffer losses in wars; The second is food, the more people who don't have food, the faster they die; All armor, sharp weapons, muskets, and cannons have to be ranked behind, and they are not worth mentioning.

So Hong Tao really doesn't have to think about what to do first, that's it! First, the collection and purification process of ammonium sulfate will be brought out, and then the grain brightness of Huangzhou, Ganliang Road, and even the entire Northern Song Dynasty will be greatly improved, which is called science and technology as the primary productive force.

How do you collect ammonium sulfate? This is a new topic, and Hong Tao has not touched on it. But it doesn't matter, he has the time and manpower, try it slowly.

It is not easy to use the water bath method to make hydrochloric acid, because the ammonia content in the coke oven gas is not so high, and it is not as easy to dissolve in water as chlorine.

So to change the way of thinking, can we get a higher concentration of coke oven gas and increase the neutralization time? This time, it depends on the ugly children of the Hu family.

He has a spirit for all kinds of kilns and all kinds of pipelines, and has long succeeded his father Hu Er as the largest potter in Huangzhou. He invented a series of pipes and cooling pools to collect coal tar, and now it's up to him to do it.

Coal tar is the use of coke oven gas, the process of synthesizing ammonium sulfate does not need to be established separately, the choice is to add a gas collection room in front of the gas cooling pool, and use a blower to blow all the coke oven gas into this closed space, and first react with the sulfuric acid in the sulfuric acid pool below. Wait until the gas temperature drops, then open the valve and put it into the cooling pool.

In this way, the ammonia content is high, the concentration of ammonium sulfate solution is large, and some impurities are removed for the coal tar, which is also good for the later fractionation of coal tar, which is really an excellent way to get N in one fell swoop.