Why do some people say that flooded land cannot be cultivated directly? What s the saying?

Let's start with the familiar things around you. When we build buildings or railways and highways, we often pile up dirt around them. These soils are usually new soils that have been dug out of the ground and piled together.

This mound has one characteristic. If it is not used for a long time and no one takes care of it, it is often that the grass does not grow in the first year, and the grass grows in the second year, but it is not lush and scattered. As time goes on, by the third year, more and more grass grows on the mound, becoming more and more lush.

The grass that grows on the mound is also associated with this area.

Southern China has a humid climate, abundant heat resources and high precipitation. The grass will grow one year, but it may be gone the next year. If it's in the north, it's two or three years.

It is even more difficult to grow grass in the northwest. After heavy rainfall, nitrogen, potassium and other elements in the soil are easily lost. As we all know, one of the necessary conditions for plant growth is the 17 elements necessary for plants.

Without essential elements, plants cannot grow, but without essential elements, plant growth is inhibited.

Due to the erosion of floods, the soil loses more essential elements, which will cause many plants to not grow. We can liken essential elements to food, and flooded land can be used as a room. The popular understanding is that there is no food in this room, and everyone who comes to this room will starve to death.

Due to the special geological background of this area, a large number of iron and manganese oxide films in the soil have a strong adsorption effect on heavy metals.

According to my reliable understanding, when there are a large number of heavy metals in the flood, the flood will inundate the soil as the water level rises, and the iron-manganese oxide film will trap a large amount of heavy metals in the lower layer of the soil, causing more serious pollution. Generally speaking, there are many "small sponges" in the soil, which absorb heavy metals into the "small sponges". Even if the water recedes, it will not take away the "small sponge" that adsorbs heavy metals in the soil.

However, many heavy metal elements are toxic to plant growth, which further leads to inhibition of plant growth. Oxygen insufficiency**.

After heavy rain and waterlogging, nitrogen, potassium and other elements in the soil are easily lost; Due to the special geological background of the region, a large number of iron and manganese oxide adhesive film in the soil has a strong adsorption effect on heavy metals, when there are a large number of heavy metals in the flood, as the water level rises and the flood soaks the soil, the iron and manganese oxide adhesive film traps a large number of heavy metals in the middle and lower soils, resulting in more serious pollution. At the same time, there is not enough oxygen** and the accumulation of sediment leads to a large number of microorganisms dying or migrating, so it is not suitable for immediate farming.

Cultivated land that has been flooded for a long time can be deposited with organic matter with fertilizer, but the surface soil and water of the flooded land that was once suitable for cultivation are washed away by the current, and the mud deposited later belongs to cold soil, and cold soil cannot be cultivated directly without improvement. This cold soil improvement takes a certain amount of time. If flooded land is cultivated without repair and improvement, rotten seeds will not be able to take root and germinate.

Even if the seeds can germinate, there is also the phenomenon of root roasting, which directly affects the survival rate and quality of life of crops.

Why can't flooded land be cultivated?

Land that has been submerged in a flood is not allowed to be cultivated.

First, because all the land that has been drought, or the land that has passed through the flood, after the water has been available, or the flood has receded, after the sun is exposed, the soil is particularly loose, and the plants, including crops, are easy to survive, and the growth is too good!

Second, after the flood, locusts and other pests suddenly had no way to live, and all of them drowned. The rice, wheat, and beans planted in this way do not even need to be sprayed with pesticides, but the yield is excessively high!

It is too easy to harvest crops on the land after the flood, and there is no pressure of pesticides and fertilizers, and the farmers harvest the harvest of grain, which is still organic and environmentally friendly, and the mood will be too happy.

There are many lands in the world that are subject to varying degrees of flooding every year. When the flood comes, not only the surrounding people have to relocate, but a large amount of cultivated land will also be flooded, bringing huge economic losses to people's production and life. After the floodwaters subsided, the displaced personnel returned to their places of origin and gradually resumed reconstruction work.

However, it is difficult to cultivate farmland directly in a short period of time that has been flooded. What is the reason for this?

Let's start with the familiar things around us. When we are constructing buildings or constructing railways and highways, we often pile up dirt around them. This soil is usually new soil dug out of the ground and piled together.

This mound has a characteristic. If it is not used for a long time and no one takes care of it, it is often that the grass does not grow in the first year, and the grass grows in the second year, but it is not lush and scattered. As time goes on, in the third year, more and more grass grows on the mound, becoming more and more lush.

The grass that grows on the mound is also associated with the area. The south has a humid climate, abundant thermal energy resources and high precipitation. The grass can grow that year, and the grass may be empty the next year. If it's in the north, wait two or three years. Growing grass in the northwest is even more difficult.

There are some similarities between the flooded land and the new soil we dug up. After floods, upstream sediments often silt up to the banks, with blades of grass, dead wood, and growing vegetation in between. Buried together to form a new layer of soil.

It is also possible that the flood lasted too long and was soaked by the flood for a long time. Although no new soil layer has been silted, the soil structure is destroyed and the land is not productive and can no longer be cultivated.

Flooded land has no soil features. In layman's terms, it is still "raw" and not yet "mature". The earth is like a piece of land, and there is a world of difference between each other.

The land is difficult to grow plants. It takes millions of years of evolution to form the soil in which plants can grow.

After the flood, it is necessary to turn over the soil and bask in the sun, which can accelerate the mixing with the air, promote the development and circulation of microorganisms, change the maturation process of the soil, and accelerate the formation of the soil. The nutrients that plants can absorb also promote the formation of minerals and mobile inorganic salts, preparing the soil for formation.

When the soil structure is in place, green rice or corn can be grown, and the land after the flood will really become soil.

The microorganisms in the original soil were either washed away by the flood or died in large numbers in the flood environment, and did not have the ability to continue to "ripen" the organic matter.

Because flooded land breeds many pests and diseases, it is difficult for plants to survive, so they cannot be cultivated directly.

It's because there are no nutrients in such soil, and there are a lot of miscellaneous things in it, so you should nourish the land.

Pingfeng Village and Poyang Lake are separated by only one embankment. In 1964, the villagers built a dam to block the lake and build fields around the lake, forming an inner lake in the village. Due to the proximity to Poyang Lake, the artillery embankment in Pingfeng Village has been designated by Jiangxi Province as a retreat embankment, and if required, the water level of Poyang Lake exceeds the warning line, and the artillery embankment should take the initiative to open the gate for waterproofing.

The water level of the lake outside Poyang Lake is meters, exceeding the flood line required by Jiangxi Province to prevent flooding. Pingfeng village opened the floodgates and caused flooding. The yellow lake jumped into the embankment from the gate of the embankment, and the inner and outer lakes gradually flattened, and the villagers' farmland and ponds were almost flooded.

For the villagers of Pingfeng Village, who have not experienced flooding, it seems that they have no sense of the concept of their hometown being a single-retreat flood storage area. The situation in the local ** is that the concept of flood prevention has changed a lot, and it has been actively waterproofing until now after strictly preventing stagnant water. Lu Zhishu and Gao Hualin, a cadre of the main village of Shunde Township and Pingfeng Village, were the first to open the floodgates to cause floods.

The lake outside Poyang Lake is meter, exceeding the flood line required by Jiangxi Province. The protected farmland area of Pohang in Pingfeng Village is less than 10,000 mu, and it is a single retreat embankment controlled by Poyang Lake, and Hong Xiuwei's water level in the lake area is meters. The water level in the Poyang Lake area reached meters, and the flood water almost crossed the embankment of Pingfeng Village, with a drop of nearly 5 meters from the inner lake.

The water level is still rising, but the work of the "flood control dam" cannot be slackened until the Jiangxi Provincial Flood Control and Drought Relief Headquarters has issued a notice to open the gates. It cannot be asserted on its own. It's very strict.

Gao Hualin is well aware that in the event of a flood, the green late rice seedlings and soybeans in the farmland along the shore will be flooded, and it is unknown to what extent Pingfeng Village will be flooded with the nearest house less than a kilometer from the embankment. In Beitang Village, Wutong Township, a critical area, hundreds of acres of farmland in their village were damaged by flood control levees, and crops could not be planted during the flood for 7 or 8 years, and some farmland was washed away by the floods. They hope to repair the levee as soon as possible and protect the village's farmland.

Led by Mao Junle, a villager from Beitang Village, he went to the farmland near the edge of Beitang Village, and although it was not raining at this time, the flood water still did not recede. Farmland near the river was largely flooded. The production roads in the fields were also flooded.

The place Mao Junyue was referring to was all farmland, which has now become a waterway. The collapsed cement brick house next to it was originally a dormitory for Liang Shuo's boss to grow sugar oranges on the farmland in the village. Since the farmland was often flooded, the boss did not return to his roots.

Our fields by the river have a lot of water every year, and no one dares to grow crops. Mao Junyue is a farmer in the underground tunnel of Beitang Village, his family has 3 acres of farmland near the river, and he has suffered from floods all year round, and now he does not dare to farm. You see, these were not waterways, they were all farmland, and now they have become waterways.

Because it's damp. Planting on such land can easily lead to root rot of plants.

When the flood comes, not only the surrounding people will have to relocate, but also a large number of farmland will be flooded, which will have a great impact on people's production and life and economic losses. After the flood receded, the displaced people have returned to their original residences, and the recovery and reconstruction work is gradual, however, those cultivated land that has been flooded is difficult to be directly used for cultivation in a short period of time, if you want to grow crops on a piece of land, in addition to having good seed resources, necessary nutrient inputs, but also rely on the external natural ecological environment, mainly in the following aspects.

The submerged land and water should be drained, ditches should be dug on the ridges, a few ditches should be dug in the fields, and a few drainage ditches should be made where it is conducive to drainage; In a place where there is no flooding, but the ground is very dirty, you can sprinkle water and wash it 1-2 times to sweep the water away. After draining, first expose to the sun for a period of time, at least 7 days, if there is no sunlight, it is not surprising to half a month; In this way, sterilization is started, which accelerates the evaporation of water vapor in the soil and allows the land to continue to recover. One is the right light, temperature and precipitation environment.

There is not much to say about this, but it is the basic requirement for the normal growth of most plants, especially terrestrial plants.

Suitable temperature, precipitation environment, light intensity and light time can effectively improve the growth efficiency of crops, improve the breeding quality and total water splitting. Illumination is directly related to other objective factors, if there are objective factors that are not conducive to the growth of crops, crops can not grow healthily and quietly, there will be growth weakness, dead seedlings, wilted seedlings, poor pollination, deflated grains, empty buds, false ears and other quality decline and yield reduction phenomenon, can not ensure the basic and reasonable harvest of land production"。

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Because there is no way to grow farming discrete if you cultivate directly, and it will cause serious infiltration effects, there will be many problems, and nutrients will also be lost, so some crops grown by Peiwan Ridge are not particularly good.

Because there is a lot of sediment in the flood, these sediments do not have any nutrients, there are many pathogens in the flood that will cause the death of plants, and there are many harmful substances in the flood world, which will harm the seeds of plants.

Because the properties of these soils have changed. The soil is resistant to a large amount of sediment, and some organic matter has not been decomposed and cannot be directly absorbed by crops. Eventually, it will affect the yield of crops.

Because the soil has too much moisture, there are a lot of bacteria in it, there is no nutrients in the soil, there is no oxygen, and the soil environment is not good.

The flood season, most of them are in June, July and August of the Gregorian calendar every year, all crops are in the jointing, tall, heading stage, the straw has not grown too mature, that is to say, there is still a little tender, at this time the distribution of water, the flooded straw after the flood soaking, as long as more than 20 days, is almost erosive, after the flood recedes, it is simply all lodging. One might ask, was the flood that deep? The corn and sorghum can be overdone, and the water can stay for more than 20 days.

It's summer again, and most of them are rotting in the ground, which is the best fertilizer for the next year, and the soil is much softer. After freezing in winter, bacteria and pests are frozen to death, and the soil for spring cultivation is loose and delicate, and the first fertilizer is also omitted. When the farmer is knee-high, he can see that the harvest after autumn is at least two or three more layers of grain than in previous years.

The flooded land, the ordinary topsoil is washed away, the topsoil is lost, the fertility of the land is gone, and the remaining land is compacted and uneven. It takes a lot of effort to cultivate and level, and more organic fertilizer should be applied to the land. After the flooding, the time of cultivation will be delayed, and the season will not be forgiving, and the ordinary missed season can also be postponed.

And most of the floods are mostly at the same time.

In June, July, August, and September, it is too late to delay rice and corn, level the land, apply organic fertilizer, and add water conservancy equipment. As a result, it is unlikely that the flooded land will be cultivated immediately.

The flooded land can not be confused, if it is nearly flooded, not washed by the flood, the ordinary topsoil will not be lost, this should be the topsoil, after the flood, it can be replanted immediately, but the speed should be fast, seize the season to plant stupidly, so that the season is caught, the fertilizer is supplemented, and then the management keeps up, the water conservancy equipment keeps up, and the loss of the year is not large.

Due to the vast territory of our country and the occurrence of floods every year, I think that in view of the flood situation in various places, those who can be cultivated must still be cultivated, and those who can rush to replant must be replanted, so as to minimize the losses of farmers, produce more grain, and try their best to ensure the food safety of the country!