What does the first frost mean to kill a hundred herbs?

Question 1: About the origin of the first frost, how did the first frost come from? Every year, around Gregorian calendar 10 year 10, when the sun reaches 2 10 degrees, it is the first frost in the 24 solar terms. The first frost is the last solar term in autumn, which is the transition from autumn to winter. There is a lot of heat dissipation on the ground in autumn, and the temperature suddenly drops below 0 degrees. Water vapor in the air directly condenses on the ground or plants to form fine ice needles, and some become hexagonal frost flowers, which are white and loose in structure.

"Twenty-four solar terms" said that the first frost: in mid-September, the gas was cold and condensed, and the dew became frost. At this time, there has been frost in the Yellow River Basin of China, and a piece of silver ice crystals is shining in the fertile fields. At this time, the leaves turned yellow and fell. The ancient book "Twenty-four solar terms" said: "Qi stagnates at the beginning of frost, and Yin begins to coagulate". It can be seen that the "first frost" means that the weather is getting colder and the dew condenses into frost. In ancient China, the first frost was divided into three stages: first, the jackal sacrificed animals; Second, the vegetation is yellow; Three stings are salty. The jackal began to catch prey, sacrifice animals, and return books to heaven with animals, paving the way for sacrificing autumn gold; The leaves on the earth turned yellow and fell; The stinging insects are motionless in the cave and hang their heads into hibernation.

"The first frost in the first frost" reflects the climate characteristics of the Yellow River Basin. As far as the annual frost days are concerned, there are frost and snow in some parts of the Qinghai-Tibet Plateau even in summer, and the annual frost days are over 200, which is the place with the largest number of frost days in China. * * * The annual frost days in the east, southern Qinghai, Qilian Mountain, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountain, Altai Mountain, western mountainous area of northern Xinjiang, northeast China and eastern Inner Mongolia all exceed 100 days, and the vast areas south of Huaihe River, Hanshui River and eastern slope of Qinghai-Tibet Plateau are all below 50 days, south of 25 north latitude, only about/kloc-0 in Fuzhou, Sichuan Basin.

"The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "The wind knife and frost force the sword", which shows the ruthlessness and cruelty of frost. In fact, frost and frost are inseparable, but it is "freezing" that harms crops, not "frost". Someone once tried to put two leaves of a plant in a box Y with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.

Question 2: What should I do if the first frost corn is not ripe? The first frost-it's getting colder and colder, and it's frosty. The first frost usually occurs on the 23rd day of the Gregorian calendar 10 year 10.

The first frost occurs when the sun reaches the longitude of 2 10 degrees every year around Gregorian calendar 10 year10 23rd. The first frost said that the weather was colder and the dew condensed into frost. "Twenty-four solar terms": "In mid-September, the essence is cold and condensed, and dew cream". At this time, frost has appeared in the Yellow River Basin of China, and a silver ice crystal shines in the fields thousands of miles away. At this time, the leaves turned yellow and fell. The ancient book "Twenty-four solar terms" says: "When the frost comes, the yin begins to coagulate." It can be seen that "first frost" means that the weather is getting colder and it begins to frost. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period. Some people also call the first frost "Chrysanthemum Frost", because chrysanthemums are in full bloom at this time, and Su Shi, a great writer in the Northern Song Dynasty, said in a poem: "All trees are sweeping away pornography, and only Furong is alone."

Frost is formed by condensation of water vapor. How can water vapor condense into frost? Lv Benzhong, a poet in the Southern Song Dynasty, wrote in Nan Gezi? "Travel Notes" wrote: "The moon invades the post, and the bridge is frosty at night." Lu You wrote in Frost Moon that "the withered grass is frosty and gray, and the cold window is full of new shadows." It shows that frost appears on a clear moonlit night in autumn. There are no clouds in the autumn night, and the ground is like a quilt, which radiates a lot. When the temperature suddenly drops below 0℃, the water vapor on the ground will condense on streams, bridges, leaves and soil, forming tiny ice needles, and some will become hexagonal frost flowers. Frost can only form on sunny days. People say that "the thick frost is fierce" is the reason.

The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different.

From a scientific point of view, the saying that "dew becomes frost" is not accurate. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the phenomenon of crop freezing injury caused by the sudden drop of temperature, and its harmful temperature varies with crops, varieties and growth periods. To form frost, the temperature of the ground or ground objects must drop below 0℃, and the water vapor content in the air on the ground should reach a certain level. Therefore, there may not be frost in first frost, and there may not be frost in first frost. However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost.

"The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "Wind knives and frost swords are pressing each other hard", which shows first frost's ruthlessness and cruelty. In fact, frost and frost are inseparable, but it is frost that harms crops, not frost. Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.

It is better to say "frost kills a hundred herbs" than "the first frost kills a hundred herbs". Frost is the expression of cold weather, and freezing is the enemy that kills crops. Because there is frost when it is frozen (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost.

Anti-freezing method

(1) Plant early in time and stagger the frost in late autumn;

(2) selecting early-maturing and high-yielding varieties;

(3) water, because dry soil dissipates heat faster than wet soil;

(4) Smoking can form heat preservation clouds in a small area, thus reducing freezing injury;

⑤ hoeing, "the hoe has fire", can increase the ground temperature;

⑥ Apply sodium humate or phosphate fertilizer to make crops mature in advance. Experiments show that it can ripen Chinese yam, corn and millet for 5-7 days in advance.

The most fundamental thing is afforestation, which can adjust the temperature and completely change the environment.

In the first frost, autumn harvest has been completed in most parts of the north. Even cold-resistant onions can't grow any longer, because "the first frost can't support onions, and the longer they grow, the more empty they are." In the south, it is the peak season of "Sanqiu". Only single-season hybrid rice and late rice are harvested, and early-season wheat and early-season rape are planted. Picking cotton, pulling cotton stalks, ploughing and soil preparation. "When all the straws are pulled out, there will be fewer insects and diseases in the next few years" >>

Question 3: Farmers' Proverbs about Weather Qingming scraped the grave soil and it rained for forty-five years.

It's sunny and sunny, and it's raining in Grain Rain. It didn't rain in Grain Rain, and then it began to rain.

Clear sky in Wan Li, six animals flourish; Clear rain will damage all the fruits.

It rains a lot in Grain Rain, but it doesn't rain late in Grain Rain.

Long summer, mulberry old wheat.

East wind to long summer, wheat waterlogging.

It's never too late to plant anything from long summer to full summer.

There was a strong wind in the long summer, and all the wheat was gone.

Before and after Xiaoman, plant melons and beans.

Small and warm, hoe wheat and grow miscellaneous grains.

After planting for more than ten days, it is not an empty planting.

If you don't sow, you will fail in the future.

Wheat with awn seeds appeared, followed by autumn ploughing.

The awn seeds blow the north wind, and the roots of the seedlings are dry.

It doesn't rain on the solstice of summer, and it's extremely hot in the dog days, so it's rare for it to be cloudy for ten days.

It didn't rain on the solstice of summer, and there was no rice in the shop.

The summer solstice is not hot in the future, and the winter solstice is not cold in the future.

It's windy and hot on the solstice in summer, and it doesn't rain on Chongyang in winter.

When the summer solstice comes into rainy days, farming is like watering the garden.

The east wind blows on the summer solstice, and the water washes away in half a month.

No potatoes and no beans in summer.

Slightly Xia Feng motionless, first frost arrived late.

When you reach early autumn in summer, you will pile up fertilizer in the field.

There is no rain in beginning of autumn and little rain in autumn; There is no rain for a thousand years and no frost for a hundred days.

Beginning of autumn mows the grass in summer, and the autumn equinox mows the fields.

There is rain in early autumn, but there is no rain in early autumn.

The autumn rain is falling, and the next year will be a bumper harvest.

Plant mountains in summer, plain rivers in white dew, outdoor in autumn equinox and meanders in cold dew.

The first autumn drought, halved, summer rain, as expensive as gold.

It's sunny for thousands of years, and the millet is as silver.

The white dew is early, the cold dew is late, and the autumnal equinox is the time to plant wheat.

The autumnal equinox is not cut, and the frost grinds the wind.

Autumn equinox millet can't be cut, and cold dew millet can't be raised.

The grain and grass pile up cotton, and the cold dew does not forget to turn the ground.

Hit six or nine heads in spring and plow cattle everywhere.

On February 2nd, cucumbers and lettuce (eggplant) all landed. Every day is the lunar calendar, the same below.

Mai xiu gun gun, 45 days to play.

Stir-fried wheat in the long summer and three dynasties.

Yuan and wheat together, cold beans (broad beans) and wheat lost their souls.

The first flower, the second bean and the third red bean.

In February, Maixiuqiming, in March, Maixiuqiming.

Grab early rice and raise late rice.

Row onions in July and garlic in August.

The Millennium is charming, and the autumn equinox is beautiful.

There is no green rice in the cold dew, and the first frost falls. (refers to single-season late rice)

People are jumping in the house and rice is laughing in the field.

Cold dew and grass fall (referring to green manure), more dead and less alive.

Only lazy people have no lazy fields.

A stone of soybeans is not as white as cotton.

If the water conservancy is well repaired, the harvest can be guaranteed

A foot ditch is impassable, and a thousand ditches are free (useless).

Foot wheat is afraid of inch water, inch wheat is not afraid of foot water.

People depend on food, and fields depend on fertilizer.

Three treasures of farming: pig F (dung), river mud and safflower.

One inch of loose soil equals the last trip of dung.

Three plows, six rakes and nine hoes, one season of crops is worth one year.

Work hard and you will make a difference in the coming year.

Seeds are selected every year, and the output is also increasing.

I'd rather be hungry than eat food.

In June, there was a southwest wind, and rice worms were born.

Wheat is afraid of spasm, and rice is afraid of plague.

When the bud is rice, it is most suitable for falling grain. (of early rice sowing)

Build a house and look at the beam, and the rice looks good.

Mow the paste (fertilizer) in time.

Grass is a weed bud, not a weed.

The first frost picked onions, but he didn't need anything.

If the heat is not hot, the grain will not bear fruit.

Tie the root of wheat, the top of grain and sesame seeds in the middle.

Reflect temperature change

There is no hard ground after the fright.

On April 8, Black Pod froze to death.

The cold and slight cold froze the old man to death.

Reflected precipitation

The ants moved the snake gallery, and it rained in three days.

There are clouds hanging in the sky and rain dripping on the ground.

Clouds to the east, with a sieve; Clouds go west, drenching dead chickens.

Big institutions, small institutions, dead mice.

August thunder, don't be empty.

It's dark in the east and dark in the west. I can't wait to eat.

Frogs croak together, and heavy rain comes.

When the stars blink, it won't rain far.

The dog takes a bath, and a thunderstorm is coming.

Agricultural activities and climate

Farming indiscriminately in long summer.

In leap months, it is advisable to sow early.

Before Grain Rain, cotton was planted early.

After April 8, there are flowers without pimples.

The awn is busy, but the rice is not busy.

Millet yellow-seeded wheat, wheat yellow-seeded wheat.

Hang a hoe on July 15th.

Autumn equinox millet cold dew valley.

Ten days before the Millennium is not worth it (early), and ten days after it is not too late (it is said to be planting wheat).

Reflect weather changes

Where there are black clouds and yellow buds, there must be hail marbles.

Hail line, frost area.

Sunset clouds, mountains and rivers roar at midnight.

Dark clouds have rain, red clouds have wind.

The sun is dizzy in the middle of the night, the rain is dizzy, and the moon is dizzy at noon.

Don't go out at dawn, the sunset will kill you.

Crocodile grass, the cold wave is coming.

Chicken should be put on the shelves early, and the weather will be fine tomorrow.

There are fish scales in the sky, so you don't have to turn the sun.

A year reflecting disaster and harvest.

Thirteen months old, rice is worthless.

March thunder, Maigedui (good year), February thunder, Tomb Gedui (bad year).

......& gt& gt

Question 4: Climatic characteristics of the first frost: Because there is frost when freezing (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost. The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different. In the first frost season, the cool autumn wind blew to Guangzhou, the flower city. The average temperature in northeast China, eastern Inner Mongolia and most parts of northwest China has been below 0℃. "The first frost in the first frost" reflects the climate characteristics of the Yellow River Basin. As far as the annual frost days are concerned, there are frost and snow in some parts of the Qinghai-Tibet Plateau even in summer, and the annual frost days are over 200, which is the place with the largest number of frost days in China. * * * The annual frost days in the east, southern Qinghai, Qilian Mountain, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountain, Altai Mountain, western mountainous area of northern Xinjiang, northeast China and eastern Inner Mongolia all exceed 100 days, and the vast areas south of Huaihe River, Hanshui River and eastern slope of Qinghai-Tibet Plateau are all below 50 days, south of 25 north latitude, only about/kloc-0 in Fuzhou, Sichuan Basin. The first frost in autumn is called the first frost. The earlier the first frost, the greater the harm to crops. The first frost in all parts of China is gradually delayed from north to south and from mountainous areas to plains. Except for areas with frost all the year round, frost first appeared in the north of Daxing 'anling, usually at the end of August. The first frost in most parts of Northeast China, Inner Mongolia and Northern Xinjiang is mostly in September. 10 The first frost has appeared in Shenyang, Chengde, Yulin and Changdu to * * *; 165438+1Frost has been seen in Shandong Peninsula, Zhengzhou, Xi 'an and northwest Yunnan in early October; Frost did not appear in eastern China, Hanshui and Yunnan provinces until the beginning of 65438+February. When first frost went from Xiamen and Guangzhou to Baise and Simao, it was the beginning of October after 65438+ years. Frost is the condensation of water vapor when the ground encounters cold weather, so it is not the frost in the first frost, but the phenomenon that the ground will produce the first frost when the weather is cold. From a scientific point of view, the saying that "dew becomes frost" is not accurate. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the phenomenon of crop freezing injury caused by the sudden drop of temperature, and its harmful temperature varies with crops, varieties and growth periods. To form frost, the temperature of the ground or ground objects must drop below 0℃, and the water vapor content in the air on the ground should reach a certain level. Therefore, there may not be frost in first frost, and there may not be frost in first frost. However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost. "The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "Wind knives and frost swords are pressing each other hard", which shows first frost's ruthlessness and cruelty. In fact, frost and frost are inseparable, but it is frost that harms crops, not frost. Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite. It is better to say "frost kills a hundred herbs" than "the first frost kills a hundred herbs". Frost is the expression of cold weather, and freezing is the enemy that kills crops. Because there is frost when it is frozen (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost.

Question 5: Is the first frost of this year10,24 sweet or bitter? Because there is frost when it is frozen (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost.

The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different. In the first frost season, the cool autumn wind blew to Guangzhou, the flower city. The average temperature in northeast China, eastern Inner Mongolia and most parts of northwest China has been below 0℃.

"The first frost in the first frost" reflects the climate characteristics of the Yellow River Basin. As far as the annual frost days are concerned, there are frost and snow in some parts of the Qinghai-Tibet Plateau even in summer, and the annual frost days are over 200, which is the place with the largest number of frost days in China. * * * The annual frost days in the east, southern Qinghai, Qilian Mountain, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountain, Altai Mountain, western mountainous area of northern Xinjiang, northeast China and eastern Inner Mongolia all exceed 100 days, and the vast areas south of Huaihe River, Hanshui River and eastern slope of Qinghai-Tibet Plateau are all below 50 days, south of 25 north latitude, only about/kloc-0 in Fuzhou, Sichuan Basin.

The first frost in autumn is called the first frost. The earlier the first frost, the greater the harm to crops. The first frost in all parts of China is gradually delayed from north to south and from mountainous areas to plains. Except for areas with frost all the year round, frost first appeared in the north of Daxing 'anling, usually at the end of August. The first frost in most parts of Northeast China, Inner Mongolia and Northern Xinjiang is mostly in September. /kloc-At the beginning of 0/0, frost has appeared in Shenyang, Chengde, Yulin and Changdu.

165438+1Frost has been seen in Shandong Peninsula, Zhengzhou, Xi 'an and northwest Yunnan in early October; Frost did not appear in eastern China, Hanshui and Yunnan provinces until the beginning of 65438+February. When first frost went from Xiamen and Guangzhou to Baise and Simao, it was the beginning of October after 65438+ years.

Frost is the condensation of water vapor when the ground encounters cold weather, so it is not the frost in the first frost, but the phenomenon that the ground will produce the first frost when the weather is cold. From a scientific point of view, the saying that "dew becomes frost" is not accurate. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the phenomenon of crop freezing injury caused by the sudden drop of temperature, and its harmful temperature varies with crops, varieties and growth periods.

To form frost, the temperature of the ground or ground objects must drop below 0℃, and the water vapor content in the air on the ground should reach a certain level. Therefore, there may not be frost in first frost, and there may not be frost in first frost. However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost.

"The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "Wind knives and frost swords are pressing each other hard", which shows first frost's ruthlessness and cruelty.

Yes In fact, frost and frost are inseparable, but it is "freezing" that harms crops, not "frost".

Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.

It is better to say "frost kills a hundred herbs" than "the first frost kills a hundred herbs". Frost is the expression of cold weather, and freezing is the enemy that kills crops. Because there is frost when it is frozen (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost.

Question 6: A detailed introduction of the solar terms in the first frost in October ―― It's getting colder and colder, and it's first frost. The first frost usually occurs on the 23rd day of the Gregorian calendar 10 year 10. At this time, the first frost usually appears in the Yellow River basin in China, and most areas are busy planting crops such as three wheat.

In ancient China, the first frost was divided into three stages: "One stage was that the jackal sacrificed animals; Second, the vegetation is yellow; Three waiting insects are salty. " In this solar term, jackals will show their prey before eating; The leaves on the earth turned yellow and fell; The stinging insects are motionless in the cave and hang their heads into hibernation.

The first frost occurs when the sun reaches the longitude of 2 10 degrees every year around Gregorian calendar 10 year10 23rd. The first frost said that the weather was colder and the dew condensed into frost. "Twenty-four solar terms": "In mid-September, the essence is cold and condensed, and dew cream". At this time, frost has appeared in the Yellow River Basin of China, and a silver ice crystal shines in the fields thousands of miles away. At this time, the leaves turned yellow and fell. The ancient book "Twenty-four solar terms" says: "When the frost comes, the yin begins to coagulate." It can be seen that "first frost" means that the weather is getting colder and it begins to frost. Meteorologically, the first frost in autumn is generally called "first frost" or "first frost", and the last frost in spring is called "late frost" or "final frost". The interval from the last frost to the first frost is a frost-free period. Some people also call the first frost "Chrysanthemum Frost", because chrysanthemums are in full bloom at this time, and Su Shi, a great writer in the Northern Song Dynasty, said in a poem: "All trees are sweeping away pornography, and only Furong is alone."

Frost is formed by condensation of water vapor. How can water vapor condense into frost? Lv Benzhong, a poet in the Southern Song Dynasty, wrote in Nan Gezi? "Travel Notes" wrote: "The moon invades the post, and the bridge is frosty at night." Lu You wrote in Frost Moon that "the withered grass is frosty and gray, and the cold window is full of new shadows." It shows that frost appears on a clear moonlit night in autumn. There are no clouds in the autumn night, and the ground is like a quilt, which radiates a lot. When the temperature suddenly drops below 0℃, the water vapor on the ground will condense on streams, bridges, leaves and soil, forming tiny ice needles, and some will become hexagonal frost flowers. Frost can only form on sunny days. People say that "the thick frost is fierce" is the reason.

The solar term of the first frost means that the weather is getting colder and first frost begins. To the south of latitude, the average temperature is around 16℃, and there are three solar terms before the first frost day. In the southern valley of South China, frost can only be seen in the dead of winter. Of course, even at the same latitude, the temperature and humidity of the air close to the stratum are different due to the difference of altitude and topography, and the first frost period and frost day are also different.

Frost is the condensation of water vapor when the ground encounters cold weather, so it is not the frost in the first frost, but the phenomenon that the ground will produce the first frost when the weather is cold.

From a scientific point of view, the saying that "dew becomes frost" is not accurate. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the phenomenon of crop freezing injury caused by the sudden drop of temperature, and its harmful temperature varies with crops, varieties and growth periods. To form frost, the temperature of the ground or ground objects must drop below 0℃, and the water vapor content in the air on the ground should reach a certain level. Therefore, there may not be frost in first frost, and there may not be frost in first frost. However, due to the low temperature when frosting, if the arc continues to cool, it is easy to cause frosting.

"The first frost kills a hundred herbs", plants that have been hit by severe frost have no vitality at all. This is because the liquid in plants forms ice crystals due to frost, protein precipitates, and the water in cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated. "The wind knife and frost force the sword", which shows the ruthlessness and cruelty of frost. In fact, frost and frost are inseparable, but it is frost that harms crops, not frost. Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period. This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.

It is better to say "frost kills a hundred herbs" than "the first frost kills a hundred herbs". Frost is the expression of cold weather, and freezing is the enemy that kills crops. Because there is frost when it is frozen (sometimes no frost is called black frost), autumn frost and spring frost are collectively called frost.

Question 7: Will the plants in the first frost freeze? The first frost kills a hundred herbs. Plants suffering from severe frost are lifeless. This is due to the liquid in plants, and frost (frost refers to the sudden drop of temperature and the sudden drop of surface temperature below 0℃) damages or even kills crops. It's different from frost. Frost is a white ice crystal that condenses directly on objects when the water vapor in the air near the ground reaches saturation and the ground temperature is lower than 0℃. When there is frost, it is not necessarily frost. ) forms ice crystals, protein precipitates, and the water in the cells extravasates, which makes the protoplasm seriously dehydrated and deteriorated.

"The wind knife and frost force the sword", which shows the ruthlessness and cruelty of frost. In fact, frost and frost are inseparable, but it is frost that harms crops, not frost.

Someone once tried to put two leaves of a plant in a box with the same low temperature, one of which was frosted and the other was not frosted. Results The leaves were seriously damaged in frost-free period, but there were only slight frost marks in frost period.

This shows that frost can not only harm crops, on the contrary, when water vapor condenses, it can also release a lot of heat. 0 g of steam at 1℃ condenses into water, and the heat of vaporization released is 667 calories, which will turn heavy frost into light frost and light frost into dew to avoid frostbite.