Fang ye said: "of course, an ecosystem also contains many different food chains!

In addition to frogs, common beneficial agricultural animals also have various spiders. Some of them make webs in the rice field and prey on flies such as rice planthoppers and moths. Some spiders don''t make webs. They hunt and prey like Rangers on the upper reaches of rice straw stems and leaves. They move rapidly, making it too late for the flies to escape!

There are dragonflies, which are carnivorous insects. They can hunt while flying. In addition to catching pests such as moths, they are also good at killing mosquitoes in rice fields!

Not only do flying mosquitoes feed on them, but the larvae of mosquitoes in the water can''t escape their prey. Rice fields are an ideal habitat for dragonflies.

At present, there are no dragonflies in our rice fields, but there are frogs. Will the dragonflies be far away? They may appear in the next round of sowing! "

The children made a burst of exclamation: "Oh ~"

"Dragonflies can sometimes be seen near the green belt downstairs of my house!"

"When I was cutting rice just now, I saw a spider running away!"

Tang Xiaoxin dislike the way: "I hope dragonflies make complaints about mosquitoes."

She doesn''t know why. She is very popular with mosquitoes for some reason!

Several people in the family watched her bite every time, and a bite would swell a big bag, which could not disappear for several days.

One summer vacation, I stung my mouth. My mouth was swollen like a sausage. I had an appointment with my classmates to play. My image was too humiliating to go out. I couldn''t go out. I stayed at home for a week. The thief felt bad.

Fang ye said, "there are also many creatures in the underwater world of rice fields!

For example, fish such as tamarisk and loach feed on small insects and animal and plant debris scattered in the water.

In addition to avoiding the predation of birds such as herons, they should also guard against ferocious predators in the water.

Beetles like dragon lice, also known as water turtles, are good fishermen in the water. They swim very fast!

There are so many plants and animals here. They eat, drink, grow old, die, produce feces, withered leaves, animal limbs and corpses. The ecosystem in the rice field can also deal with these "garbage".

For example, we may have the impression that when we eat seafood barbecue, we take a long mouthful of soup, pick it with a toothpick, and take a small mouthful of fragrant and spicy meat, right? "

The little fat man who just shouted to eat the pot couldn''t help swallowing his saliva, and the parents couldn''t help laughing!

Remember the good memories of catching water turtles, loaches and snails in the fields in childhood.

"The snail is usually hidden in the mud and water. It''s actually a dustman in the field and a diligent dustman in dealing with garbage!

In addition to the planktonic algae that are hard to see by human eyes in the rice field, their food will also eat the withered leaves and clean the animal bodies in time to prevent them from rotting and smelling in the water and affecting the water quality.

In this process, animals such as dragon lice will also participate, and these "garbage" will become smaller and smaller.

Then, microorganisms such as bacteria and fungi that are difficult to see by the naked eye will complete the final finishing work, reduce organic matter into inorganic minerals, become nutrients for plant growth, and re-enter the cycle. "

Rice, algae, duckweed!

Mosquitoes, planthoppers, moths, spiders, dragonflies!

Locusts, frogs, mice, snakes, herons!

Loach, dragon lice, snail, microorganism!

The children listened to Fang ye and gradually built a three-dimensional picture in their minds.

It turns out that in addition to rice, there are so many creatures in the rice field. It''s a colorful little world.

If I just said that when I was growing rice, I certainly didn''t feel much.

However, I personally planted rice seedlings in the paddy field, witnessed the growth of rice, saw all kinds of organisms in the field, and experienced such a process. After listening to Fang Ye''s combing, I would have a deeper understanding.

Fang ye said, "these food chains are intertwined to form a complex food web.

The more complex the food web is, the stronger the ability to resist external interference is. The simpler the food web is, the more prone it is to fluctuation and destruction.

In today''s farmland, a large number of pesticides and chemical fertilizers are applied. Spiders, frogs and snakes can no longer live. Pests are easy to breed. They have to apply pesticides, rats eat crops, put rodenticides and arrange rat traps.

Microorganisms can not survive, and the fertility of the soil has decreased or not increased. They can only continue to apply more chemical fertilizers, and the soil will gradually become hardened and become a dead cycle.

The rice we grow uses organic fertilizer fermented by animal manure, and there is no pesticide. It can still thrive.

Of course, compared with applying chemical fertilizers and pesticides, the yield of paddy fields will certainly be less, and it also needs patience to restore the health of the land. With such a large population and great food pressure, it may not be able to become the mainstream mode of production.

However, such a paddy field is equivalent to a small wetland, providing a habitat for frogs, birds and many animals, increasing species diversity and playing a positive role in improving the surrounding ecological environment. "

Some parents were surprised and said, "headmaster, the rice yield is not low at all! I think the rice is full!"

Fang Ye smiled. Isn''t this nonsense!

In addition to organic fertilizer, when I raked the field, I mixed some spiritual soil in the field. Of course, the rice grew well.

Tang Xiaoxin was very clever. For example, he said, "applying chemical fertilizer is equivalent to taking the examination results as the goal, reciting formulas, a large number of questions, reciting the answer routines of reading questions, and reciting the composition template!

However, we study not only for the test, but also to exercise our logical thinking. Some life philosophies and literary literacy can be used for life. However, parents and teachers care about the test results. "

Qian cocoa quickly agreed and nodded: "yes, yes! Grades are not the most important. I am lively and healthy."

Qian''s mother couldn''t help shaking her head: "the child said that it''s the most important for you to have fun!"

Qian Keke refused and said, "my biological results are excellent!"

It turned out that biology had been hovering around the passing line. Now she was close to full marks every time. Even she was surprised.

For students, interest in learning is also a key factor affecting their grades.

These children in the rice field have such a personal learning experience. It is estimated that their biological performance will not be poor in the future.

Fang ye said with a smile, "that''s almost the truth. Well, do you have a rest and continue to act!"

The children scattered in a crowd and continued to cut the rice vigorously. Now almost half of the rice is left to be cut.

After threshing the millet, it''s time to dry the millet!

Fang ye called the breeder of the small farm and put half a bag of grain in the bucket to dry.

Today, we said that we should eat fresh rice. We can''t finish drying it in such a short time. Even if the weather is hot and the ground is dry, we should dry it for three or four days.

A small amount will be treated with machines first, and the rest will be dried slowly when the tourists leave.