Liu Su thought for a while and did not directly answer Zhiyi's question, but said: "In fact, in addition to preventing insects and weeds, rotational planting can also make the land more fertile.

Such as rice and sheep mushrooms. Rice has a well-developed root system, which can loosen the soil and change the soil structure. Sheep mushrooms can directly increase nutrients in the soil.

The two are planted in turn, and the soil will be fertile for a long time.

Another benefit of crop rotation is that the nutrients in the soil are balanced. For example, corn mainly absorbs nitrogen and silicon from the soil, while soybeans mainly absorb calcium from the soil.

Rotational planting can prevent the nutrients in the soil from being consumed one-sidedly."

"Xiao Su'er, what are these nitrogen, silicon, and calcium"? Qingsang suddenly interjected and asked.

Liu Su was suddenly questioned by Qingsang, and was stunned on the spot: This is exciting, forgetting that the elements have not been discovered in this ancient world.

She looked up and saw that not only Qingsang was looking at her like a curious baby, but even Zhiyu was too.

couldn't help but smile bitterly, and said with his forehead: "This nitrogen, silicon, and calcium are all elements." Just as iron is found in iron, there are also various elements in this soil, such as nitrogen, silicon, and calcium.

They are all invisible to the naked eye, but they are real. There are also a large number of elements in the human body: iron, calcium, and zinc are indispensable elements in the human body.

No matter how much I said about this, I didn't ask. Because with the current conditions, it is impossible to see or touch. Don't say it."

Zhiqi and Qingsang listened to these things that they had never known before, and they were actively absorbing them as if they had discovered a new world.

But Liu Su stopped abruptly. This made Qingsang and Zhiyu, who were not satisfied with their thirst for knowledge, all staring at Liu Su with a pair of eyes that were fascinated and unworthy.

Liu Su was very uncomfortable by the two, so he had to laugh.

At this time, the blue hunter came over and invited the three of them to dinner. Liu Su was able to completely escape from this topic.

This time also reminded Liu Su that he should be cautious when speaking in the future.

After the meal, news also came from the succulent flower moonlit night, and the outlet of the underground river was found, and several people set off again.

Along the way, Liu Su didn't dare to say anything easily. Even Zhizhi asked her some questions about the intercropping, but Liu Su excused herself and said it later.

An hour and a half later, Liu Su and the others finally heard the sound of water flowing again after rounding the two mountains.

As the sound of water became closer and closer, Liu Su and the others also walked out of the mountains and forests.

What catches your eye is a vast blue sea. Looking at it from afar, it is really as the poem says: "The sunset and the lonely bird fly together, and the autumn water grows together in the sky".

Standing high on the cliff, they watched the water of the underground river slope down from a small cracked canyon into the sea.

If you look at the cliff from the sea, you should be able to enjoy a spectacular view of the waterfall.

Qingsang and the others have always lived on the inner road, and they have never been to the beach.

The largest river I have ever seen should be the boundary river of the Song and Wei dynasties - Jiao River.

They were all deeply shocked by the first sight of the sea.

At this time, Liu Su took out the treasure map taken out of the notebook and looked at it carefully.

Let's take a closer look at the map with our current location.

Because hundreds of years have passed since the time when the treasure was buried, some geographical locations have changed over the sea.

Liu Su pondered for a long time before determining the approximate location.

In her heart, she asked Hua Yueye to ask the various plants in that location if there were foreign objects buried under the root system.

After half a ring, the specific position is obtained.

"Uncle, I found it. Let's dig for treasure first.

When you build a great ship that day, I will take you on a voyage. Looking for redheaded, blonde beauties to go, how"?

Qingsang and others were attracted by Liu Su's words.

Blue Hunter asked curiously, "Girl, are there any red-haired and blonde people?"

Liu Su nodded casually and pointed to the distance of the sea: "At the end of the sea, there are still many people of various hair colors and skin colors, and they have also established countries.

It's just that now the maritime industry is underdeveloped, and no one has any contact."

Zhiqi was surprised to hear it again, and just wanted to ask, but Liu Su waved his hand: "Master Zhiqi, don't ask."

I really want to know, in my lifetime, I will try to build a huge ship, and I will take you out to sea to see the different countries."

Qingsang suddenly became interested: "Okay, okay, this must go." Fake monk, you have to work hard"!

Zhi Yan smiled helplessly, and had to admit in his heart that this little girl was a personal essence.

"The poor monk also wants to see the wider world."

Liu Su looked at the excitement of the two, and there seemed to be an ambition to travel around the world in his heart.

It would be exciting to think that there was a huge ship in ancient times that could travel all the major countries in ancient times.

"Okay, let's take care of the present."

As he spoke, he walked to the burial place of the treasure and pointed: "Blue Hunt, Blue Leopard here, help me dig it."

Qingsang and Zhiyu also followed.

"Little Su'er, are you sure this is where the treasure is buried? It's not hidden at all, it's just a pit dug and buried."

Liu Suhan said with a smile: "Who can come to this place, you can't reach it without a boat by sea." On the one hand, I have to climb several mountains to get here, and who will come if there is nothing to do.

And hundreds of years ago, I don't know what it was like here, maybe it was just a small embankment at that time.

The ancestor of the Yalita clan. He sailed to this place, docked, and buried the treasure on the spot.

It took hundreds of years of geographical changes to form the current appearance.

So I really don't know. Is there any treasure left?"

When Liu Su and the others were discussing, Lan Hunt and the others had already started digging with their swords.

When digging to a depth of more than two meters, the sword was against a wooden box, and along with the blue leopard, Qianfeng and others also dug something.

When they were all cleared, there were five or six fine porcelain jars, three large wooden boxes, a large iron box, and a few small wooden boxes.

"This can't be made of golden silk nanmu, fake monk, look at this, this should be gloomy wood.

That's a lot of money. Just these boxes are priceless, and there are no goods in the market.

Even in the palace, there should not be so much golden silk nanmu, and the gloomy wood is even more legendary."