I make a popular science video and all the emperors learn from it!

[Popular science continues.] 】

[Sorghum propagation method:].

[Seed treatment:

It is divided into seed selection and sun-dried seeds. Before sowing, winnowing or screening is carried out to eliminate small grains, deflated grains and diseased grains, and select large grains and full seeds for production. At the same time, it takes 2~3 days to dry seeds in sunny weather, so as to improve the germination potential and germination rate of seeds. 】

[Sowing:

Sowing time: Timely sowing is the key to ensure that the seedlings are complete, full and strong.

Sorghum seeds are not tolerant to low temperature when germinating, sowing too early and germinating slowly, and are susceptible to bacterial infection, resulting in powder seed or mildew, and will also increase the occurrence of smut and affect the yield.

The sowing date is determined according to the growth date, ground temperature and soil conditions of the variety. Generally, the ground temperature of the 5 cm cultivated layer is stable at 10~12 °C, and the soil moisture content is 15%~20%. 】

[Sowing density: The sowing density is based on the principle of "fertile land should be dense and thin land should be thin".

Usually 65~70 cm ridge, double row equidistant strip sowing on the ridge, abduction seedlings, small row spacing of 12~15 cm, plant spacing of 18~20 cm, sowing depth of 3~4.5 cm is appropriate.

In the low-lying wet place can be slightly shallow, covering 2~3 cm of soil, and the arid plot should be germinated and covered with tight.

The sowing depth of different soil types should be flexibly controlled, the clay soil is compact and easy to compact, so it should be sown shallowly, and the sandy soil has poor moisture retention and can be sown deeply. 】

【......】

There is more to it than just words.

It even comes with a video.

In the video, a modern farmer demonstrates how to grow sorghum in person.

The emperors of the dynasties who were originally sleepy widened their eyes.

In unison, they shouted, "How did man run to the sky?".

And the people in the video are dressed strangely.

It is impossible to tell which dynasty it is.

[The ten crops that have made the greatest contribution to mankind in popular science!].

[Eighth place: Sorghum science popularization completed.] 】

[Three minutes later, the seventh place in popular science begins: cotton].

All text and video disappear from the light screen.

The shock that can bring to everyone has not dissipated.

The video is short, but it reveals a lot of information.

The road in the video is very wide and smooth, and you can't see the end as far as you can see.

And the big iron box running on the road, what the hell is it?

I don't know how many times faster than the carriage!

And it looks like there is not the slightest bump.

Several houses in the distance are even more ridiculously high, at least dozens of stories!

This scene brought the shock to the ancients, no less than when Li Hongzhang went to visit abroad.

The voice of the emperors.

Ying Zheng: The widow must live forever!

Liu Bang: Well, I've lived for so long, and I've never seen such a bizarre thing.

Liu Chan: The big iron box looks very fun, but there are no livestock to pull it, how can it run so fast, is the horse hiding inside?

Li Shimin: Wait, ethanol can be used as fuel... It won't be the fuel of the big iron box!?

Zhao Kuangyin: People are already numb, can you give me a reward?

Zhu Yuanzhang: Let's take a look today, Daming is still too poor.

Kangxi: Impossible! Absolutely impossible! It is actually more prosperous than the Qing Dynasty!

......

The people of all dynasties were also stunned.

They could never have imagined that there was a place that could be so prosperous.

The fields are even paved with neat roads.

How rich does this have to be to be such a loser?

...........................

Three minutes are fleeting.

[The ten crops that have made the greatest contribution to mankind in popular science!].

[Seventh place in popular science: cotton].

[Cotton is an annual herbaceous plant or perennial shrub plant of the genus Cotton in the Malvaceae family. 】

[The characteristics are as follows: the leaves are broadly ovate, the apex is acute, the base is broad, the petiole is sparsely pubescent, the leaf is ovate sickle-shaped, the flowers are solitary in the leaf axils, the peduncle is slightly shorter than the petiole, the calyx is cup-shaped, the seeds are separated, ovate, with long white cotton hairs and gray-white short cotton hairs that are not easy to peel.

The flower buds of cotton are milky white, and gradually turn dark red after flowering, and the petals wither and leave a green fruit, which is the cotton boll;

The boll is a capsule with a cottonseed inside, and the cottonseed has a layer of hairs on the outside, which gradually grows to the entire boll. 】

[The flowering period of cotton is in June ~ October. 】

[The origin of cotton is the three countries of Afghanistan and the camel country. 】

[Before cotton was introduced to China, there was only kapok for filling pillows in China, and there was no cotton that could be woven into cloth. 】

[At that time, the clothes of the poor were made of linen and inferior animal skins. 】

[Not only is the warmth effect poor, but it is also very uncomfortable to wear, and it often causes itchy skin. 】

[And those who are slightly richer, will choose to wear silk and fur. 】

[Cotton was introduced to China during the Northern and Southern Dynasties at the latest, and it was mostly planted in the border areas at that time, and it was only introduced to the interior in large quantities at the end of the Song Dynasty and the beginning of the Yuan Dynasty. 】

A video is attached below the text.

It shows the whole process of cotton from seed to maturity picking.

Chen Yu, who made the video, even put in the movie clip of picking cotton in the Eagle Sauce Manor.

Under the dark skin inside, the cotton is so snow-white and soft.

Qin Dynasty.

Ying Zheng looked at the crops he had never seen before, and his heart was full of emotion.

But who is the black-skinned human in the video?

They are really skilled at picking cotton.

Ying Zheng wanted to catch some and put them in Daqin's fields to work.

Fusu on the side looked excited, "Father, this cotton is an excellent crop." "

"The Qin Dynasty froze to death many people every winter. "

"If there is cotton, people don't have to stay at home to fight the cold in winter. "

Ying Zheng couldn't help but glance at him.

Although Fusu was pedantic, he learned all the benevolence of Confucianism.

This time there is a video in the whole process of popular science.

Most of the people of the Qin Dynasty were illiterate, but there was a sound commentary in the video.

When they heard that the poor could only wear sackcloth and low-quality animal skins, the corners of their eyes suddenly soured.

"This kind of linen clothing and low-quality animal skins not only have a poor warmth effect, but they are also very uncomfortable to wear, and often cause itchy skin. "

The sound in the video made them unable to hold back any longer.

Yes, they really can't afford to wear silk and fur.

Every winter is a test of life and death for them.

Many elderly people and children will die in the snow, even if they hide at home.