The guard of the Vertical Border City is still a person who has been believed by Lu Chensheng.

Although he uses the people of the Great Cangguo, Lu Chensheng can also guarantee that there will be no accidents.

Even if the other party rebelled, in Lu Chensheng's opinion, there would basically be no risk of losing the city.

"Shopkeeper, your students ask to see you."

Just as Lu Chensheng and Du Rufang were talking about something, the attendant outside walked in and said respectfully.

"Let them in."

Lu Chensheng said when he heard this.

The students don't come to him much now, and they don't know what the reason for this sudden visit is this.

Lu Chensheng was a little curious, and asked the other party to bring people in.

A moment later, Lu Chensheng's student walked in with a hint of joy on his face.

"Sir, we have made three kinds of fertilizer according to Mr.'s method."

Erhu's face was full of joy, and he said a word to Lu Chensheng.

"Made?"

Lu Chensheng was also slightly stunned when he heard this.

"Yes, sir, do you have time to take a look?"

Lu Chensheng nodded directly when he heard this, "Let's go and have a look." ”

After speaking, Lu Chensheng glanced at Du Rufang on the side, "Brother Du wants to go and have a look?" ”

Du Rufang nodded immediately when he heard this, he did have some curiosity about what kind of fertilizer this was, and he also wanted to see what kind of thing it was.

Previously, I heard that Xinghancheng came out with a fertilizer, which can greatly increase the yield of rice fields, so that the crops in the fields can be harvested into more than 200 catties per acre!

That's a staggering statistic!

In the homes of ordinary people, an acre of land is only about 100 catties, but here, there is a direct increase of 100 catties, how can it not be surprising?

Several people went out together, walking towards a rather remote place in the distance.

Then I saw that there was not a trace of people here, not to mention the handles of the soldiers, and there were several extremely huge jars standing beside them.

"Nitrogen on the right, phosphorus in the middle, and potassium on the left."

Erhu introduced this.

He mobilized a lot of people to develop this project, and now it has been thoroughly developed.

The soil method taught by the husband is relatively simple, but the fertilizer produced will be relatively small.

But this is just the beginning of the experiment, and if it is successful, they can start to expand their production capacity.

"What is nitrogen, phosphorus and potassium?"

Du Rufang didn't wait for Lu Chensheng to speak, but said with a little doubt in his expression.

"The so-called nitrogen, phosphorus and potassium are the three elements of fertilizer, nitrogen can make plants lush and green, photosynthesis is strong, the trunk is strong, and the rice is full and the yield is high, but not too much, otherwise it will cause the crazy growth of crops, easy to be greedy for green and late maturity, and weaken the resistance to drought, cold, diseases and insects.

Phosphorus can promote plant germination, root growth, branching, fruit and maturity, lack of such elements, will make plants bloom late, small fruit.

Potassium can improve the intensity of photosynthesis, increase the ability to resist cold, and can also promote the robustness of the stalk, increase the resistance to lodging and disease, if it is lacking, it will make the branches thin, the branches and tillers are less, and the yield is not high. ”

After Erhu finished speaking, he looked at Lu Chensheng on the side and said with a smile.

"Sir, the student is not wrong!" Scale Literature

"Well, I talked about it very carefully, and it seems that I work weekdays."

Lu Chensheng nodded approvingly, quite satisfied with his students' answers.

Du Rufang was stunned when he listened to it, he didn't know very well what the other party said.

But I probably understood that these things are needed for the growth of plants, and these things can make the rice harvest better.

"How did Brother Lu know about these things?"

Du Rufang had a little confusion in his eyes, and he had never heard of such a classic on Jiang Guo's side.

Since there is none, how did Lu Chensheng learn this knowledge?

"Brother Du has seen the mountains and forests after the fire, and the wild fruits that have regrown in these mountains and forests are exceptionally large and delicious, and the branches are extremely strong, far more than the rest of the place?"

Du Rufang pondered slightly after listening, and then shook his head.

He didn't notice it.

"If Brother Du pays attention, you can know that this is indeed the case."

Seeing this, Lu Chensheng was not surprised, but just continued.

"If this is the case, it must not be done out of thin air, in which the ashes of the trees after burning are the ashes of the plants, which is the element potassium, and there are actually other elements in it after the fire.

Now it's just being made after being stripped separately. ”

Lu Chensheng pointed to the big jar on the side, which was full of existing materials, and then put them into it to brew and ferment, turning them into fertilizer.

For example, the tissues, feces and bones of animals are turned into phosphate fertilizer.

Melon peels, bean husks, vegetable leaves, etc., can be turned into nitrogen fertilizer.

Grass ash and the like, this is a potash fertilizer.

The fertilizer is placed in a huge jar and left to burst in the sun to speed up the reaction time.

In this way, simple fertilizer making also comes out.

When the time comes, you can directly use the water in it and water it into the field.

This is a relatively simple fertilizer to make, and with the amount of fertilizer here, it must be able to meet the supply of the three cities in the coming year.

Du Rufang's face was full of surprise.

He didn't expect that there was such a big knowledge in the crops.

And since Lu Chensheng is studying these, he must also be thinking about improving the cultivation situation of the people in the future.

As he said to Lu Chensheng before, since there are so many livelihoods outside and money can be made, why do the people still farm?

And now, Lu Chensheng gave him an answer.

Because of these things, when the crops grow, they will not be so easy to fall into the ground, and it is not easy to lose the grain, so that it will not be difficult to cultivate in the barren land.

In this way, in the future, the harvest of the people will be very high, and Lu Chensheng's taxes on the people will be reduced a lot.

If you think about it this way, you are making a living outside, but you can still make a lot of money from farming, so you must not let the fields go to waste.

Lu Chensheng had already thought about all this.

Du Rufang was relieved in his heart, and he felt more and more that following a person like Lu Chensheng would definitely become very different in the future.

Maybe the historical records a hundred years later will be full of Lu Chensheng's exploits.

And he is fortunate to be able to give birth at this moment, only when he exerts his residual heat.

Du Rufang took a deep look at Lu Chensheng, and then turned around and left, he was going to Jiyun City to help Lu Chensheng take care of everything in Jiyun City, so that all of Lu Chensheng's policies could be implemented.