Dates from 15 million years ago were discovered, what did dates look like in that era?

Their morphology is basically the same as that of modern southern jujubes, except that there are 3 6 germination holes commonly known as eyes at the top of the current southern jujube fruit, and the first fossil with 7 germination holes has appeared, indicating that the morphology of ancient southern jujube 15 million years ago is more diverse than that of modern descendants.

The morphological structure of the fruit of ancient southern jujube is basically the same as that of modern southern jujube. The slight difference is that the current southern jujube fruit has 3 to 6 germination holes at the top, commonly known as "eyes". For the first time, a fruit with seven germination holes appeared in the fossil found.

The 15 million-year-old southern jujube is different from the traditional fossil formation method, these southern jujube fossils are like well-known mummies, and the morphological structure of the ancient southern jujube is preserved in three dimensions through drying and dehydration.

It is said that it is similar to the modern southern sour jujube, but the difference is that in ancient times, there were 7 germination holes at the top. Most of the modern ones have only 5. The fossil of the southern sour jujube looks like a mummy.

The dates of that era actually grew very large, and the core was also very large, and the taste may not be the same as it is now.

It looks very ugly, a bit like an alien's head, and it looks very scary, and I wouldn't dare to eat it if it were me, and I'm sure most people wouldn't want to eat it.

According to ancient documents, the cultivation history of jujube trees is more than 3,000 years.

Modern archaeological data show that the cultivation of jujube began 7,000 years ago.

Its earliest cultivation center was the Yellow River Gorge area in Shanxi Province, and gradually spread to the lower reaches of the Yellow River such as Henan, Hebei and Shandong.

The Book of Songs is the earliest historical book that records the cultivation of jujube trees.

In the "Book of Poetry", there is a verse "Peeling dates in August, harvesting rice in October".

It is the place where the Zhou Dynasty was founded, and it is now in Bin County, Shaanxi Province.

According to the Binxian Chronicles, the local jujube producing area is now called "Zaolin Chuan" and "Zao Linping" in the Zhou Dynasty, and it can be seen that the jujube trees have a certain cultivation area at that time.

According to the "Guangzhi" (300 AD), it is recorded: "When King Wen was king, there were weak branches and jujubes that were very beautiful, and they were forbidden to be taken, and they were planted in the garden."

From the cultivation area and the wide range of utilization reflected in it, it shows that the central area of cultivated jujube is consistent with the central area of the activities of the Zhou Dynasty, indicating that Shaanxi and Jin are the earliest cultivated areas of jujube.

Judging from the growth of jujube trees now, Mizhi, Suide, Qingjian in Shaanxi, Jiaocheng and Wutai in Shanxi still grow hundreds or even thousands of years old.

By the Spring and Autumn Period and the Warring States Period, the cultivation area and scale of jujube had a great development.

The Warring States Policy recorded: "Su Qin said that Yanwen Hou said: 'There are jujubes and chestnuts in the north, although the people are not tenants, the truth of jujube chestnuts is enough for the people.

Han Feizi wrote: "Qin Hunger, Ying Hou said: 'The jujube chestnut of Wuyuan, please send it to you.'"

It shows that jujube trees have become an important food crop at that time.

After the Han Dynasty, the cultivation scale of jujube trees was further expanded.

The distribution of jujube trees spreads throughout the middle and lower reaches of the Yellow River and eastern Liaodong, and expands to the Yangtze River basin.

Archaeologists have excavated the remains of jujube kernels and dried jujube in ancient tombs in Shandong, Jiangsu, Guangdong, Sichuan, Gansu, Hunan, Hubei, Xinjiang and other places, indicating that the cultivation area of jujube in the Han Dynasty in China spread all over the north and south of China.

In ancient times, the working people of China attached great importance to the selection and breeding of jujube varieties very early, and continuously bred many excellent varieties.

The earliest record of jujube varieties is "Erya", which records 11 jujube varieties.

There are 42 varieties recorded in Jia Sixian's "Qi Min Yaoshu", 72 varieties are recorded in Liu Guan's "Jujube Spectrum" written by Liu Guan in the Yuan Dynasty, and 87 varieties of jujube are recorded in "Guangqun Fangpu" written by Wang Hao of the Qing Dynasty.

In ancient times, China has accumulated rich experience and knowledge in the propagation, planting, management of jujube orchards, harvesting and drying jujubes, processing and storage.

In ancient times, the propagation of jujube trees mainly used root tiller propagation, and the "Guangqun Fangpu" recorded that "dividing plants, selecting those with good taste, leaving them for planting, waiting for the leaves to grow, and taking large plant side strips."

Those who are two or three feet tall are transplanted".

Regarding the transplanting period of jujube, "Qi Min Yaoshu" proposes that "waiting for jujube leaves to be born and moved", and believes that "jujube is hard, so it is born late, and those who plant early are ......".Late birth. "It is advocated that jujube trees should not be planted too early, and should be planted late.

In terms of planting density, "Qi Min Yaoshu" proposed: "Three steps and one tree, the desire to do is equal" (in ancient times, three steps were about 5m now).

Ancient texts also recorded measures to promote fruit setting, such as the "anti-axe mottled vertebrae" and the flower thinning technique of "striking the branches with a rod to shake away the wild flowers".

Some of today's cultivation techniques are borrowed from and improved from ancient techniques.

Dear users, as far as I know, the largest jujube pit in the world is the "Big Mac Jujube Pit" from Xinjiang, China, which is about twice the size of a one-yuan coin and weighs more than 50 grams, which is very amazing. The jujube variety to which this jujube kernel belongs is "Xinjiang extra-large jujube", which is a special product of Xinjiang, because its fruit is huge, delicious and nutritious, and is deeply loved by people. The fruit weight of this jujube can reach more than 100 grams, which is 2-3 times that of ordinary jujubes, so it is also called "Jumbo jujube".

As a result, the jujube pits produced by this jujube have become extremely large, becoming the largest jujube pits in the world. Hope mine is able to meet your needs.