Chapter 249

In the breeding center, Xiang Hua introduced Lin Li:

"Academician Lin, you may not know that in our country, rice is divided into three types: heavy panicle type, multi panicle type and large panicle type.

Among them, the heavy panicle type is suitable for cross breeding, while the large panicle type rice, although it also has relevant technical reserves, is actually mostly used in corn and wheat.

As for the multi panicle type, there is some disconnection in both market and scientific research because of its poor lodging resistance.

There must still be people of this kind, but the retention rate in the industry is not very high. "

Seeing Lin Li nodding to indicate that he understood, Xiang Hua broke off a piece of rice ear and handed it to him, and continued:

"At present, there are 23 known rice varieties in the Da Mo community, which are basically multi panicle type.

The type I have in my hand is No. 4 rice, which has low yield, withered fruit, poor lodging resistance and disease resistance.

The only thing is that it matures early. Even without the help of spirit butterflies, its maturity can reach about 75 days. "

Lin Li took over the ears of rice and pinched them with his fingers.

As a result, as soon as his fingers exerted a little force, the grains on the ears of rice fell off and fell gently on the pair of Hongxing Erke he was wearing.

The bristling eyebrows immediately wrinkled.

Although he is now the top biological authority in China, he has standard academician treatment in life, and is even equipped with special assistants and laboratories. Even if he doesn't use his head, his legitimate income can reach tens of millions a year.

But when I was a child, Lin Li was a real rural baby.

He was born in Ganpo in the 1970s. In his childhood, he went up and down the mountain, carried firewood and planted rice.

There must be happiness, but more of it is the bitterness of life.

Although you can't see the trace of the former rural baby on your face now, an accent that may have evolved into "thick on the surface of the pot" was corrected when you went to college in the north.

But some basic agricultural knowledge still existed in his memory.

It's like a bicycle. Even if you haven't touched the handle for more than ten years, you can ride smoothly and quickly as long as you push the pedal with your left foot.

It has become an instinct.

Therefore, at the moment of touching the ear of rice, Lin Li subconsciously made a judgment:

The yield of this kind of rice is certainly not high, and it is very easy to fall over.

The so-called lodging refers to the phenomenon that crops growing upright are inclined due to natural factors such as wind, hail, rainstorm or external forces, and even the whole plant falls to the ground.

Lodging will reduce the yield and quality of crops and make harvest difficult.

When wheat, rice and other crops fall down seriously, it will seriously affect the yield and even cause a dead harvest.

No matter from which point of view, this No. 4 rice seed belongs to the garbage in the garbage.

It is this kind of waste rice that is one of the most common crops in the world of Mozambique.

It can be seen how serious the grain shortage in Da Mo world is.

Seeing Lin Li's expression was a little complicated, Xiang Hua continued:

"Academician Lin, the lowest output value of No. 4 rice seed is more than 20 kilograms per mu, the highest is about 100 kilograms, and the average output is about 40 to 50 kilograms.

In addition, even the 120-140 day mature rice seeds abandoned by the farmers in the greater Mozambique border will yield about 150 kg at most, with an average of more than 80 kg. "

Students who understand the concept of land should know.

Land is generally divided into high-yield field and low-yield field, and their concepts can be understood literally.

Even if the yield of high-yield fields mentioned by Xiang Hua is not enough compared with that of local areas.

Not enough here refers not only to modern times, but also to ancient times.

Let's talk about the situation of ancient China.

Guanzi Qiangjia records the rice yield in the spring and Autumn Period:

"Plough 100 mu all year round, and the harvest of 100 mu is no more than 20 hours."

That is, a family cultivates 100 mu of land a year for no more than 20 hours.

The mu in the spring and Autumn period and the Warring States period is very small. Three and a half Mu is equivalent to one mu now. The hundred mu mentioned by Guan is actually only 30 mu.

"Zhong" is a unit of capacity, which can hold 130 liters and can hold 80 kilograms of rice. 20 Zhong is 1600 kilograms.

The total output of 30 mu of cultivated land is 1600 kg, with an average yield of 53 kg per mu.

This is almost the average value during the Warring States period.

In addition to Guanzi, Ji Kang's health preservation theory records the output in the Wei and Jin Dynasties:

"Ten Dendrobium per mu is called a good field, which is also the general name of the world."

In other words, if one mu of land can receive 10 Dendrobium grains, it belongs to high yield.

The mu in the Wei and Jin Dynasties is larger than that in the spring and autumn and Warring States periods. About one and a half Mu is equal to one mu in the current city.

At that time, 10 Dendrobium per mu was equal to 15 Dendrobium per mu.

How many were 15 Dendrobium at that time—— Equivalent to 150 liters now, it can hold 90 kilograms of rice.

In other words, the high-yield fields in the Wei and Jin Dynasties could produce 90 kg per mu.

In the future, we will not describe it in detail. Taking the paper "Discussion on the yield per mu of rice in Taihu Lake area during the song, Ming and Qing Dynasties" published by Mr. min Zongdian of the agricultural heritage research office as an example, we record the average yield per mu of Taihu Lake Basin in the Tang, song, Ming and Qing Dynasties:

In the Tang Dynasty, the yield per mu was 138 kg;

In the Song Dynasty, the yield per mu was 225 kg;

In the Ming Dynasty, the yield per mu was 333kg;

In the Qing Dynasty, the yield per mu was 278 kg.

Yes, of course.

The main grain of each dynasty is not necessarily rice, so there must be errors in the accuracy of the yield of rice varieties.

However, this comparison itself is not expected to compare the single digits. It is sufficient to directly compare the order of hundreds.

If the people's livelihood foundation of Da Mo kingdom is based on the Qin and Han Dynasties, its grain level may only reach the level of the spring and Autumn period.

As for the current local food production, it is even more terrible.

That kind of super hybrid rice belongs to reserve grain, so we can not compare it first. Even if it is just ordinary high-yield edible rice, the yield per mu can reach 800-1000 kg.

In other words, the local output of one mu of land can reach the planting effect of 40 mu of land in the Mozambican border.

In this way, we can see how barren and backward the planting industry in Da Mo world is.

In sharp contrast to the grain output, the population of Damascus is.

In fact, the population base of Da Mo boundary is not large. Although the scale of a city is limited, don't forget that the territory of Da Mo boundary is actually very broad.

For example, the radiation range of Ziqiong city is almost a circle with a radius of 1000 kilometers.

Put it on the local side, that is, from the magic capital to Tianfu... Cough, the straight-line distance of Tianfu city is a circle for the diameter.

And this territory is only one sixth of the southern territory.

The Mozambican world is not a centralized country, so if you really want to target, you should target the level of "Earth".

Therefore, it's not surprising that the border area is wide and the population is large.

In this case, the planting industry is extremely underdeveloped, and the difficulty of basic people's livelihood in the whole world can be imagined.

Then Xiang Hua took Lin Li to another area, just a wall away from No. 4 rice seed.

However, unlike the next door neighbor, the ears of rice in this area are much stronger - as long as they are not the disabled blind judges of neon, most people can easily distinguish this.

After coming here, Lin Li looked at Xiang Hua with some insight:

"To the researcher, is this..."

Xiang Hua nodded at him and confirmed Lin Li's guess:

"Yes, this is the first generation of hybrid rice in Da Mo world, Houji No. 1.

Now the production capacity of Houji No. 1 per mu has reached more than 200 kg. Although the gap is still very obvious compared with the mainland, it has more or less caught up with the level of the ancient heyday Dynasty. "

Lin Li nodded approvingly, then his face showed a trace of curiosity and asked:

"To the researcher, how did you cultivate this kind of rice?"

Xiang Hua smiled. Before he came, he had prepared relevant abdominal manuscripts and introduced:

"Because a day and night rotation in the Da Mo world is 168 hours, many crops in the Da Mo world have the characteristics corresponding to this situation, natural selection.

Because of this, they cannot be cross grafted with local high-quality varieties, and local crops cannot be planted in damojie in the short term.

Therefore, our whole project is based on the hybrid of crops in the world of Mozambique. "

Then he spoke to Wharton. He seemed to think of something and said with some exclamation:

"Rice is a strange thing. It is a hermaphroditic crop. If they do not intervene, they will self pollinate and can't cross with other rice at all.

On the local side, in the early years, due to the underdeveloped technical means, the teacher first looked for the natural male sterile plant, that is, daughter rice for hybridization.

It took him five years to get a total of six natural daughter rice.

Then he looked for suitable male plants for these sterile plants, and it was another six years.

It's a whole eleven years... How many eleven years are there in life? "

Lin Li's face was heavy when he heard the speech:

"To the researcher, is it that you also use this method in the Mo world?"

Xiang Hua shook his head and said with a smile:

"It's much simpler now than before. The technology of artificial stamen removal in the local area has been very developed and can deal with most situations.

With the help of shennian, we can easily find sterile plants.

This is the case with houji-1, for example.

After the teacher used his mind to find out the appropriate lone rice seed, we pollinated and hybridized it with different plants and species, and then the spirit butterfly assisted the growth. Finally, there will be these generations you see.

Next, we will focus on these next generation varieties and further optimize more suitable rice varieties. "

Lin Li nodded approvingly and was about to say something when he suddenly reacted:

"Wait, you mean... The old idea?"

Xiang Hua smiled at him and nodded:

"Yes, the teacher has broken through the fourth floor of Qi practice, and his bones are much better.

Oh, by the way, he said before.

If you don't see him, it means he's resting or taking Xiaomo to play. Let me remember to tell you that everything is fine. "

......

Note:

On the last day of the month, ask for a monthly ticket, double ah!!!