Datang Library

Two plates of dim sum and a large pot of three-legged rice, Bai Fan was not polite, so he just sat down and gorged himself!

"Fan thought about it carefully on the road, and prepared for this catastrophe in two steps. The first step is to relieve the drought first. If it can't be eliminated, we must try to weaken the impact of the drought!

The second step is to prepare for the next locust plague, "

Before Bai Fan could finish speaking, he heard a few exclamations below!

"What? Plague of locusts? Boy, this is a severe drought, not a plague of locusts, what? Is there another plague of locusts going to happen?

God, is this going to destroy my human race? "Li Jiancheng cried out in grief!

Seeing that he was his father-in-law, Bai Fan patiently explained, "As the old saying goes, locusts will come after a long drought! This drought is unprecedented, so won't there be a plague of locusts?"

Li Jing retorted, "Although this is the case, can it be concluded just based on this sentence? Is there any connection between the drought and the locust plague?"

Bai Fan smiled and borrowed a pen and paper from the servant Gao Gao, and explained to the ministers what a locust is!

"Locusts belong to the category of insects, and they lay eggs! The speed of reproduction and growth are very fast. If there is no restriction and the time is not long, it will be an overwhelming plague of locusts!

But the world has its own wonders, and because of this, locusts also have natural enemies!

The existence of natural enemies is the appearance of nature to limit the disaster of locusts!

The natural enemies of locusts mainly include frogs and birds, especially frogs, which live in the same type of ecological environment as locusts. Where there are reeds, weeds, low-lying land, ponds, ditches, etc., are good for them. Therefore, frogs are the vanguard of restricting locusts from living and multiplying.

According to statistics, a frog can eliminate more than 1 pests in one summer; a frog can eat 50 pests on average every day, and the maximum can reach 266; Can prey on nearly ten thousand pests!

Birds that eat locusts include swallow-tailed plovers, white-winged gulls, field wrens, etc., and swallow-tailed plovers are the most prominent!

Birds need to prey on a large number of locusts in the brooding stage. Taking ordinary swallows as an example, a pair of parent birds and a nest of chicks can eat more than 16200 locusts every month! "

While narrating, while drawing pictures on paper to explain, Bai Fan became a guest biology teacher for a while, and began to popularize food chain knowledge to ministers in Datang!

"Speaking of this, everyone must have guessed why when there is a drought, it is often accompanied by a plague of locusts!" Bai Fan asked!

Everyone thought about it, Bai Fan's words were vivid, vivid and concise, everyone understood them, even if they had never been exposed to these things, it was not difficult to understand!

Changsun Wuji was the first to speak, "If you say that, is it because there is no water on the ground?

That's right, it must be like this. Droughts often lead to thousands of miles of barren land, the sky is covered with loess, there is no water source, and the fields don't even grow wheat seedlings, so there must be no frogs!If there is nothing to eat locusts, it will form a plague of locusts! "

Bai Fan smiled and said, "That's right, that's exactly the reason! During a severe drought, there is no food in the fields, and people will die of starvation and thirst. Frogs live on water, and there is no place to drink water, so they will definitely not survive." go down!

Birds, another natural enemy of locusts, also need to drink water. When there is no water source, birds will usually choose to fly away and relocate. Therefore, wherever there is a severe drought, there will be locusts rising! "

"In this way, as long as we solve the drought, the locust plague will disappear naturally?" Du Ruhui asked.

Bai Fan nodded, "That's right, in theory! But the reality is cruel. With the current conditions of the Tang Dynasty, it is still unable to completely eliminate the large-scale drought! So"

"Boy, even you can't do anything?

Seeing that you have studied so much on drought and locust plagues, don't you have any good ideas?You are never aimless! "Li Er asked.

Bai Fan shook his head, "It's not so amazing, it's just picking up the wisdom of the predecessors! These tutors have taught them, and in the future the academy will also set up a special department of insect biology to study the benefits and harms of insects!

As for this severe drought, Fan can only say, do your best to weaken the disaster to the greatest extent! "

"Okay, tell me in detail what you can do?"

"Brother estimates that there will be no rain in the next few months, so when the drought strikes, we point out that the rain from the sky will not work, so we can only fetch water from the ground!

There are rivers, seas and rivers on the ground, and the huge rivers will be able to withstand the severe drought and not dry up. We can use powerful water extraction equipment to draw water from the rivers to irrigate the farmland on both sides, which can relieve part of the drought!

I have a large and exquisite drum car and water wheel here!It is very convenient to get water from such surface water sources, and it will be taken out later, so that the general supervisor can make great efforts! "

"Okay! Later I will go with you to serve as the prisoner!"

"In addition to the water sources on the surface, there are also underground water sources. It can be said that there is a large amount of water underground, which is enough for Chinese people to drink and irrigate!

It's just that the depth is different, and limited by the drilling conditions, what we can use now is only those shallow water wells that are more than ten meters away from the surface!

In fact, even in arid areas with little water, there is generally water [-] meters underground, but our wells cannot be dug that deep! "Bai Fan sighed.

"Is that true? The Tang Dynasty has infinite manpower, and I send a large army. I don't believe it can't dig a hundred meters!" Li Er heard that there was water, and he suddenly became proud!

Fang Xuanling stopped and said, "Your Majesty, no, what we lack most now is time. Even if it is an ordinary ten-meter-deep well, it will take at least ten days and a half months for three or five people to build one, let alone a hundred-meter-deep well. If we dig it out, then a single well will be meaningless for irrigation!"

Li Er's expression froze, because he was confused, "Hey! What a pity!"

Gao Shilian comforted, "Your Majesty, there is no need to do this. There are still two months left. We will immediately enlist the common people to dig wells everywhere, and strive to ensure that every five households can have a well for irrigation when the severe drought comes. Three to five acres of land is also good for rations!"

"Hey, that's the only way to go. It's better than nothing! It's a pity that there is no food in the treasury. If the treasury has enough, a severe drought is nothing to worry about!

If one day, I can say that I can feed the people of the world with the national stockpile, it will be enough to laugh at my ancestors! "

Bai Fan pondered for a moment, and then said, "Actually, we still have enough time now, and there are still many ways to prepare in advance!"

Li Jiancheng slapped Bai Fan on the head, "If you have an idea, don't finish it in one breath, hurry up, the people of the whole country are waiting!"

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End of this chapter

Chapter 146 Locusts and Drilling Wells

After being patted by the old man, Bai Fan didn't dare to talk back, so he could only speak honestly, "As for the well-drilling problem, I still have some good things here, which require the joint efforts of skilled blacksmiths and carpenters. It doesn't take half a month for a deep well, and if it goes well enough, you can even get two eyes in a day!

Of course, the depth of water source is different in different regions. In some places, no water is ten meters deep, and in some places, water is less than ten meters!

We need to ensure the water output from the well, so we need professional people to observe in advance. In fact, there is no water. According to the local soil, topography, and environmental conditions, we can make a rough calculation. There is an [-]% chance that we can calculate the depth of the water source. This can also greatly increase the efficiency of well drilling and irrigation! "

After hearing this, everyone applauded. In a short time, this kid took out two sharp weapons!

Li Er praised, "Boy, I thought you were proficient in poetry and books, but I didn't expect that your craftsman's skills are even more brilliant!"

Bai Fan said sternly, "What? Does Your Majesty look down on craftsmen? The world says scholars, farmers, businessmen, hehe, is Your Majesty also so short-sighted?"

Li Er was slightly embarrassed when asked by Bai Fan, "This, the rules passed down by the ancestors, I can't be exempt!"

"It's really ridiculous, it was Guan Zhong who first said about scholars, farmers, and businessmen!

Guan Zi said: "Scholars, farmers, businessmen, and the four peoples are the rock people of the country."