Over millions of years, the dense vegetation that once grew on this land peels off and erodes, gradually accumulating into a thick layer of humus, thus forming a fertile black soil layer.

It can take hundreds of years for every centimeter of black soil layer to form.

Black soil is a very fertile soil, organic matter content as high as 5% ~ 7%, in the east and north of China, people will use 'one or two soil and two oil' to describe the fertility and preciousness of black soil.

Due to the fact that for thousands of years, human beings have overcultivated the land, and there are only three black soil areas in the world, the Great Plain of Ukraine, the Mississippi River Basin of North America, and the North and East Black Soil Areas of China.

In the black soil region of northeastern China, although it is the smallest of the world's three major black soils, the coldest climatic conditions, and the worst agricultural development conditions, it only took more than 60 years for China to turn it into a "big granary of China", which can be imagined that the fertile and precious black soil. ”

The black soil, coupled with the temperate and humid climate, abundant irrigation and water resources, and so many unique conditions, is likely to have a brilliant civilization on this plain. For example, the Yanhuang civilization first originated in the fertile plains of the Heluo River Basin, and the Indian civilization first originated in the fertile plains of the Alluvial Delta of the Indus River and the Ganges.

Unfortunately, the development of civilization of the indigenous people who once lived on this plain may have been interrupted, invaded and expelled from this fertile plain, or destroyed, in which the Nazi Germans may have played a series of negative roles, civilizational killers, invaders. Colonist. The Nazi Germans occupied this treasure land and built the new city of Berlin on this treasure land. ”

Chen Rui continued downstream along the banks of the Nu River.

The surface of the Nu River becomes very open on the plains, and the fertile soil washed down from the rainforest accumulates on both sides of the river, and on both sides of the river, there are abundant aquatic plants and dense reeds, and various species of birds inhabit them.

The waters of the Nu River are not as docile as they seem now.

In a section of the plain along the Nu River. Flooding areas are formed, as exemplified by the Kozawa district.

You know, the amount of water in the rainforest is very large, all of it is dumped in the Nu River, and in the rainy season of the rainforest, the water of the Nu River floods, and the river rises, and it is dumped in the lowlands on the plains, forming a flooding area, a lake area.

When the rainforest is in dry season. The water level of the Nu River has dropped, and the water in the floodplain area has been dried out. This process is repeated every year, and as the fertile soil of the rainforest carried by the river waters, the carcasses of dried and dead fish are deposited, and for millions of years, the fertile soil in the world has been formed.

This vast plain, there are many wild animals, and tens of thousands, or even tens of thousands, of unicorn horses and bison herds gallop on the plain, which is very spectacular.

The migration of hundreds of thousands of horned deer made Chen Rui encounter it once, and the migration of hundreds of thousands of large animals is very rare on the surface.

Hundreds of thousands of horned deer are densely distributed on the plains, looking black and oppressive from the sky, the horned deer chase the aquatic weeds, and the horned deer follow the herd towards the more abundant aquatic grass in the direction of the plain. The great migration of the horned deer also became a feast for opportunistic predators, who chased the herd of horned deer, looking for an opportunity to attack the old and weak horned deer, or the horned deer that had fallen behind, and feasted on them.

Leaving the canyon, we walked downstream along the banks of the Nu River for about two days.

Chen Rui found the ruins of an ancient city on the bank of the Nu River, broken walls, overgrown with weeds, and a piece of farmland outside the ruins of the ancient city.

This is the ruins of an ancient city of the indigenous people, and the farmland outside the ruins can show that the indigenous people have developed agriculture, from living by water to settling down, and developing towards civilization. These were destroyed by the guns of the Nazi Germans, and the process of civilization of the indigenous peoples was interrupted.

Leaving the ruins, Chen Rui continued downstream along the Nu River.

Two days later, Chen Rui found traces of modern human life.

Chen Rui found felled trees in a jungle with very flat cross-sections of tree stumps, which were cut with cutting tools such as saws and chainsaws.

According to Chen Rui's understanding, the indigenous people of the inner world are still in the era of primitive ignorance, the production tools are very backward, and there can be no saws, and the main metals of the indigenous people are gold and bronze, the gold texture is soft, and the bronze is brittle and easy to break, which is also the reason why the ancient bronze sword was made very short, and it was too long and easy to break.

Gold is soft, bronze is too brittle, and the metal characteristics that break easily cannot make a saw at all.

Therefore, Chen Rui is very sure that this is the Nazi Germans cutting wood here.

CHEN RUI PICKED UP A CIGARETTE CASE ON THE GROUND NEARBY, WHICH WAS ALSO PRINTED WITH THE LETTERS 'ATIKAH-CBARETTEN', 'AUSLESE', ETC., THIS IS A 'ATIKAH' BRAND OF CIGARETTES, MADE OF TURKISH TOBACCO LEAVES, THIS KIND OF CIGARETTE AND 'PHENAS' BRAND CIGARETTES ARE THE DAILY SUPPLIES OF GERMAN SOLDIERS, GERMAN INFANTRY, ARMORED TROOPS HAVE IT, EXCEPT FOR SS, IT IS REPLACED WITH CANDY, BECAUSE Himmler does not like cigarettes.

On the third day, Chen Rui found a boat on the surface of the Nu River, but unfortunately it was too far away, and it quickly sailed out of Chen Rui's line of sight, and it was impossible for Chen Rui to fly over to greet the people on the boat.

On the fourth day, Chen Rui found the farmland, planted corn, barley and other crops on the farmland, at this time, it was autumn, the harvest season, there were heavy golden ears of wheat on the wheat stalk, and full corn grew on the corn stalk, a German Doberman Pinscher found the arrival of a stranger, barking at Chen Rui, cracking his teeth.

At this moment, the owner of the farm, who had heard the barking of dogs outside, came out of the house, patted the Doberman Pinscher on the head, and calmed the Doberman.

"Who you are and where did you come from?" The owner of the farm is a middle-aged man, with a mustache, a very strong body, wearing jeans, boots, and an old cowboy hat.

Chen Rui doesn't know German, however, there is translation software, Chen Rui took out his mobile phone, opened the translation software APP on his phone, and said in English, "I came from the surface.!! (To be continued.) )

PS: It's almost 3 o'clock, set up automatic upload tomorrow morning.