Following.

Lao Mao and Tang Yue spent the morning taking another twenty samples in an area of one square kilometer.

The Kunlun station is located in the Ihidi Plain in the northern hemisphere of Mars, a circular basin with a diameter of 1,500 kilometers, which was hit by a meteorite 3.9 billion years ago.

In the next Mars landing mission, the Earth side will bring an improved rover capable of supporting long-distance travel, and the next scientific expedition team members will be able to drive the car on the vast plains.

Unfortunately, however, the Earth disappeared, and the whole project came to an abrupt halt.

Tang Yue spent an afternoon in the experimental cabin, and finally found a qualified product among 20 soil samples.

"This is the best soil so far, Tang Yue, you see, the main components of this sample are plagioclase and high-calcium monoclinic pyroxene, the content of high-silica glass is low, and the clay containing iron and magnesium silicate is very rich, this soil is relatively close to the soil composition on the earth, and the pH value is relatively central." Mai Dong was very pleased.

"Can I grow tomatoes?" Tang Yue asked.

"Let's do a Vis-NIR spectroscopy test first and see the results." Mai Dong instructed.

Tang Yue nodded, he immersed the soil sample in the solution, filtered and extracted the leachate, and put it into the photometer.

The results were not long in coming.

"Hmm...... Looking at the data results of this NIR spectrum, the indicators are ideal! Mai Dong stared at the atlas for a long time, and nodded slowly, "Tang Yue, where did you get this sample?" ”

Tang Yue picked up the glass dish and looked at the label, "E2, it is the riverbed of an ancient river channel, not far from us, and the old cat dug a very deep sample to take." ”

"Yes, the Ihidi Plain is a crater formed in the late Noachian period, during which a large amount of sulfate and hydrated compounds were deposited on the surface through volcanic eruptions, you are amazing, this is it!" Mai Dong clappered, "Tang Yue, this can be used as a substrate for growing tomatoes!" ”

Tang Yue was overjoyed, turned around and shouted to the front of the car:

"Old cat! U-turn back, U-turn back! Let's find the right soil! ”

As soon as the words fell, the body shook, and Tang Yue's body also crooked.

The old cat turned his head and said sullenly, "It's called Mao, the wheels are stuck in the pit."

·

·

·

The old cat and Tang Yue took more than ten kilograms of soil back with a plastic sealed bag, and the location of the soil was about a kilometer away from Kunlun Station, which was an ancient river channel that had long dried up, and the old cat swept away the sand and gravel accumulated on the surface, and used a shovel to dig down a meter deep before finding these qualified soils.

They used Martian stray dogs to carry the dirt back to Kunlun Station.

Tang Yue panted and stacked the bags in front of the garage door and slapped his face.

"There are at least fifteen or sixteen kilograms of dirt, is it enough? If it's not enough, we can dig again. ”

"It should be enough for initial experimental planting." "But the soil can't be used directly to grow tomatoes, it's just a substrate and lacks the nutrients necessary for plant growth, so we have to add ...... to it."

"Jin Kela!" Tang Yue's eyes lit up.

·

·

·

Fertilizer is a very amazing thing, it is the most important invention of human beings since they learned slash-and-burn farming, through artificial means to improve the properties of the soil, improve the fertility of the soil, so as to greatly increase the yield of crops - in the long history of human farming, learning to use fertilizer is a revolutionary progress, it is the basis for the development and growth of agricultural society.

Fertilizer is an eternal and important topic in agricultural science, and social and technological advances, especially the development of the chemical industry, have made it possible to quantitatively analyze the nutrients needed by crops and artificially provide them with these basic elements, and these technologies have finally given birth to the most important component of modern agriculture, chemical fertilizers.

One of the fundamental reasons for such rapid population expansion in modern society is the use of chemical fertilizers, which scientifically supply crops with the necessary mineral elements, so that agricultural production can be rapidly industrialized and promote the increase of grain output year by year, and the increase of grain output is the basis for population growth.

Of course, it's also a magical thing.

As the saying goes, fertilizer mixed with gold is worth two bags......

It is obvious that there is nothing to use as fertilizer in Kunlun Station, but fortunately, Tang Yue is an organic fertilizer making machine, which is probably the meaning of Tang Yue's existence - as early as thousands of years ago, the ancestors of the Chinese learned how to use organic fertilizer to improve the fertility of the soil and promote the growth of crops, which is probably an innate skill rooted in the bones of the Chinese.

The thousand-year-old farming civilization has deeply engraved the love of the land in everyone's genes.

Otherwise, why do so many people like to read farming texts?

Lao Mao and Tang Yue turned out all the dry feces in the waste collection box, and all the feces were dried and sucked by the toilet, dry and hard like stones, and wrapped in vacuum packaging - according to the regulations, all the garbage generated in the Kunlun station is not allowed to be thrown on the surface of Mars at will, and all must be brought back to Earth.

However, this provision is now repealed.

Tang Yue wherever he wanted.

The two of them brought all the feces into the garage, and this kind of work must not be done in the main station, otherwise Kunlun Station would not be able to live there.

Tang Yue poured the dry feces on the garage floor, counted them at random, and found that in the past three months, his bowel movements have been quite uniform and smooth, all the feces here are his own, and before that, other people's feces and garbage have been taken away by Orion One.

The old cat squatted down, holding a stick in his hand that he didn't know where to find, and poked the packaged stool on the floor with interest, "Tang Yue, I think you may be severely constipated and have dry stools, you see that you are pulling Xiang as hard as marble." ”

Tang Yue put on a mask and didn't want to deal with the old cat.

The old cat was still poking the feces on the ground, turning over and poking over and over again.

"Tang Yue, look, does this tuo Xiang look like a vacuum-packed tea egg? How did you pull out such a round? Can you give us a demonstration? ”

"And this, this lump is big, I guess, there must be at least five taels......"

"It's very artistic, it looks like Van Gogh's starry sky."

"Hey Tang Yue! Come and see this, this tuo Xiang looks very much like you! It's just carved out of a mold, you are really a father and son......"

Tang Yue angrily picked up a piece of dry stool and smashed it over.