There are three major elements of plant growth, namely sunlight, air and water.

This is tropical, with strong sunshine, abundant precipitation, and not isolated from the world, so these three elements are all satisfied.

It is precisely because of this that the trees here grow so lush and tall.

However, these are only three elements of plant growth, not the three elements of good plant growth.

What Yunning needs is the fruits, not the trunks.

Therefore, we need to find ways to increase the yield of fruit trees.

Fertilization is undoubtedly the best way.

Corresponding to plant growth, there are three elements that grow well.

They are nitrogen, phosphorus and potassium.

As long as these three elements are sufficient, coupled with abundant precipitation and strong sunshine, Yunning will receive the fruits brought back by the thunder beasts every day.

Potassium fertilizers in nitrogen, phosphorus and potassium are easier to collect. Although Yunning has not planted them in person, he still reads a lot of historical time travel novels.

The most primitive and simplest potassium fertilizer is wood ash.

Collect the weeds and branches and burn them with fire, and the ashes obtained are wood ash.

This is the principle that people called slash-and-burn farming in ancient times.

After burning with fire, the land has abundant potassium fertilizer and can naturally grow well. After planting for a few years, the fertility of this land has decreased. People migrated to other places and continued to slash and fire. After the original land was once again covered with weeds, they continued to come back to burn the wasteland.

Of course, this is just the most primitive method. As a modern person, Yunning can naturally burn wood ash in other places and then transport it to the place where he needs it.

Potassium fertilizer is easy to solve, but nitrogen fertilizer is more difficult to solve.

Nitrogen is a huge element in this world. 78% of the air is nitrogen, but the problem is that nitrogen is extremely stable and difficult to be used by humans.

Bean plants have natural nitrogen fixation ability, the problem is that Yunning does not have seeds of bean plants.

After all, he is a trainer, not an agriculturalist, and it is impossible for him to go out with all kinds of seeds.

In addition to legumes, the most common source of nitrogen fertilizer in rural areas is feces.

However, there are too many fruit trees that Yunning needs to cook.

With his own ability to make dung by adding dozens of elves, he really cannot meet the needs of fruit trees on the island.

Therefore, Yunning turned his attention to the sea.

In addition to the elves, there are also a large number of fish and shrimp in the sea.

Marine animals contain a large amount of nitrogen and phosphorus elements. That is to say, as long as Yunning can obtain a large amount of fish and shrimp, the problems of nitrogen and phosphorus fertilizer can be solved at one time.

Then the question is, how should Yunning catch so many fish and shrimps?

Not to mention that Yunning doesn’t know how to make fishing nets, even if Yunning has fishing nets, he doesn’t have a big enough fishing boat to catch fish!

Just relying on Yunning's lifeboat, how many fish and shrimps can be pulled back at one time?

"It's hard to deal with~"

Yunning sat on the stone by the lake and knocked on his forehead.

If these problems cannot be solved, I am afraid I will not even be able to grow smoothly.

Maybe it will be two years later when the fire dinosaur evolves into the flame spitting dragon.

"Milu~"

At this moment, the sound of the Dianlong attracted Yun Ning's attention.

Yun Ning looked up and saw the electric dragon holding the tree fruit and distributing it to the elves in the lake.

The elves who got the tree fruits followed Daidai Beast honestly and became their younger brothers.

Or it is to play house with Daidai Beast.

Although Daidaizun actually doesn't understand what Play Jiajia means.

"This is!"

Yun Ning widened his eyes and watched the Dinglong skillfully distribute the tree fruits.

It’s not that I feel sorry for these tree fruits, but that the behavior of the electric dragon inspired Yunning.

If you don’t know how to catch fish by yourself, it doesn’t mean these water elves don’t know how to catch fish!

People are born to live in the ocean, and there are no trees and fruits in the sea. Most of them live by catching small fish and shrimps.

Since that's the case, why don't I cooperate with them?

They will catch fish and shrimps, and then give them a certain reward?

Tree fruits are obviously not allowed. Although compared with fish and shrimp, the nutritional value of tree fruits is much higher, and the elves are willing to use fish and shrimp to exchange for tree fruits.

But the added value of the tree fruit is too low.

A tree fruit cannot be exchanged for many fish and shrimps.

It is different to make a tree fruit into energy blocks. The low-level energy block made of 4 tree fruits may be exchanged for more than 10 times the number of fish and shrimps than the fruit.

This is just like the scissors gap between industrial countries in previous lives for agricultural countries. Agricultural countries provide cotton to industrial countries, and industrial countries make clothes and then sell them to agricultural countries.

No matter how you sell it, industrial countries make money.

As a highly intelligent human, Yunning naturally cannot exchange the most primitive fruits. It is the most cost-effective to make energy blocks that elves have never seen and cannot make in exchange for the resources they need.

He did it as soon as he said that, because he was busy with camp production during this period, Yunning stopped making energy blocks, resulting in a lot of fruit left in Yunning's space backpack.

With Yunning's current proficiency, it is already easy to make low-level energy blocks. In just 3 days, Yunning made 100 low-level energy blocks.

When doing business, fair transactions are important, but promotion is also very important.

Since these elves have never eaten energy blocks for generations, Yunning chose to provide them with the first energy block for free.

After eating the energy block, these elves could no longer face the food they had in the past.

No wonder I'm improving so slowly, it turns out that the food is too rubbish!

This idea quickly occupied the brains of all the elves, and they came to Yunning to ask for more energy blocks.

When things developed to this point, Yunning naturally revealed his capitalist appearance.

Want energy blocks? Yes, exchange them for a ton of fish and shrimp!

I don’t care what kind of fish or shrimp you are, or what you are alive. As long as it is the corpse of the fish and shrimp, it is fine. It is used as fertilizer anyway.

The elves who are unwilling to continue to eat junk food have a slow improvement in their strength, but they can only accept Yun Ning's condition.

Although these elves are good at fishing, they are so big and they only have so many things to carry at once. Therefore, Yunning also specially issued a small wooden sign to each of them, registering the number. When the elves under this number submit a ton of fish and shrimps, they can obtain an energy block.

Although Yunning could forcibly tame these elves to catch fish and shrimps for himself, the laws of human social development told Yunning that only voluntary ones are the most efficient.
Chapter completed!