Why is it said that organic matter cannot be lacking in cultivated soil?

Organic matter is essential for the growth of crops, organic matter can make the soil more fertile and can ensure sufficient nutrients for crops.

The lack of organic matter in the cultivated soil will affect the survival and growth of crops. This is because organic matter is an essential substance needed for the growth of crops, and it provides nutrients for the growth of crops. Crops that lack organic matter generally do not grow well or do not survive at all.

Because crops cannot grow without organic matter, it must be contained in the soil.

The main influencing factors and regulatory methods are as follows:

1. The state of organic residues: Generally speaking, animal and plant residues with more water content decompose faster than dry animal and plant residues; Smaller debris decomposes faster than larger debrassment.

2. Carbon-to-nitrogen ratio of organic residues: In the process of microbial life activities, the carbon-to-nitrogen ratio of organic matter is 25:1.

If the ratio of carbon to nitrogen in organic residues is less than 25:1, due to the high content of nitrogen, it not only decomposes quickly, but also converts excess organic nitrogen into inorganic nitrogen and leaves it in the soil for plant use. If the carbon-to-nitrogen ratio of organic residues is greater than 25:

1. Due to the lack of carbon and nitrogen, the nitrogen required by microorganisms is insufficient, resulting in a decrease in vitality, so the decomposition rate will decrease.

3. Ash element content of organic matter: The high content of ash elements indicates that the nutrients are abundant, and it is also easy to neutralize the acids produced during the decomposition of organic matter, which is more conducive to the transformation of organic matter.

4. Temperature: Under normal circumstances, the suitable living temperature for microorganisms in the soil is 25-35. Temperatures above 45 will inhibit microorganisms; When the temperature is between 0 and 35, the decomposition rate of organic residues can be accelerated as the temperature increases.

5. Humidity and air permeability: In general, the soil has good air permeability, and the soil moisture content is 60-80% of the soil field water holding capacity, which is suitable for microbial decomposition of organic residues.

If the soil moisture is too high, it will clog the pores between the soils, resulting in a lack of oxygen, and the decomposition rate is slow, the decomposition is incomplete, and it is easy to produce organic acids such as acetic acid, propionic acid and butyric acid.

6. pH: The appropriate pH value depends on the type of microorganisms in the soil. The appropriate pH for most bacteria is; The suitable pH value of actinomycetes is alkaline; The suitable pH of the fungus is acidic (suitable pH between 3 and 6).

The organic matter in the soil includes various organic substances, microorganisms and various organic substances that can be decomposed and synthesized. Soil organic matter is an important component of the solid phase of soil. Although the content of soil is only a small fraction of the total soil, it has extremely important aspects of soil formation, soil fertility, environmental protection and sustainable development of agriculture and forestry.

The following is an introduction to the types of organic matter and the reasons for the lack of organic matter.

1. Types of organic matter.

1. Fresh organic matter: refers to substances that have not been decomposed by microorganisms in the soil, such as plant residues.

2. Decomposition of organic matter: The decomposition of microorganisms makes plant residues lose the characteristics of their original form, and simple organic compounds will cause less damage to the soil.

3. Humus: It refers to brown or dark brown macromolecular colloidal substances that are decomposed and then synthesized by microorganisms. Combined with soil mineral soil particles, soil particles are the main morphological types of soil organic matter, soil organic matter needs microbial transformation, and the transformation process of soil organic matter microorganisms is the most important and active process of soil organic matter transformation.

2. Causes of insufficient organic matter.

1. Planting crop debris and soil biological remains, this kind of organic matter is mainly planted crop remains, but this kind of organic matter is not completely biodecomposed, resulting in more plant pathogens, and joint cropping is easy to produce diseases, resulting in reduced plant yield.

2. Artificial addition: It is mainly made of animal manure and plant residues through fermentation, which is called organic fertilizer, and the natural fermentation of farmers is also a kind of organic fertilizer. At present, 80% of the organic fertilizers on the market are not completely fermented, and such organic fertilizers are easy to burn the roots when used directly in the root system, and the plants are not easy to absorb the nutrients in them.

3. Solution.

The addition of organic fertilizer can increase the content of organic matter in the soil, among which the fermentation and decomposition of animal and plant fertilizers also contain amino acids, nitrogen, phosphorus and potassium, medium and trace elements, which not only increases soil fertility, but also chelates with fertilizers in the soil, improves fertilizer utilization efficiency, and increases the effective period of fertilizer. At the same time, it provides living space for microorganisms and soil organisms, promotes the reproduction of microorganisms and soil organisms, and thus increases soil permeability.

Organic matter in the soil accumulates slowly, and some soils can be over-cultivated and planted to cause the loss of organic matter. Therefore, in the process of planting, we should also pay attention to the protection of soil fertility.

This is because there are some soils whose nutritional value is not particularly high, and there is a lack of humus in the soil, so it will lead to low organic matter and low acidity and alkalinity.

Because some soils do not have a strong ability to retain water and nutrients, nutrients are easily lost, so the organic matter is not high.

These organic matter decomposes and transforms over a long period of time under natural conditions, eventually forming humus in the soil. Natural soils have low levels of organic matter, typically between 1% and 5%.

These organic substances are decomposed and transformed by microorganisms in the soil, and finally form humus in the soil. Cultivated soils have a high content of organic matter, usually between 2% and 10%.

Cultivated soils generally have a higher content of organic matter than natural soils, and the quality of organic matter is also better, containing more nutrients and microorganisms. This is due to the fact that the artificially added organic matter contains more nutrients, and the added organic matter can promote the growth and reproduction of soil microorganisms, which in turn promotes the formation and transformation of organic matter.

In conclusion, natural and cultivated soils have different organic matter**, so their organic matter content and quality also differ. People can improve the organic matter content and quality of the soil by adding organic matter, thereby improving the fertility and water retention capacity of the soil and promoting the growth and development of crops.

It is the main source of soil nutrients. Organic matter contains various nutrients required for crop growth, and can directly or simply provide nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and various trace elements for crop growth. In particular, more than 95% of the nitrogen in the soil is present in the soil in an organic state.

Because soil minerals generally do not contain nitrogen, in addition to the nitrogen fertilizer applied, the main ** of soil nitrogen is provided by the decomposition of organic matter. The carbon dioxide produced by the decomposition of soil organic matter can be used to supply green plants for photosynthesis. In addition, organic matter is also important for phosphorus, sulfur, calcium, magnesium and trace elements in the soil**.

Promote the growth and development of crops. Hu Min acid in organic matter can enhance plant respiration and clear jujube, improve the permeability of cell membranes, enhance the absorption of nutrients, and at the same time, vitamins and some hormones in organic matter can promote the growth and development of plants.

Improve the fertilizer retention capacity and buffering performance of the soil. The organic colloids in the soil organic matter, with a large number of negative charges, have a strong adsorption energy early caution, can adsorb a large number of cations and water, and its cation exchange capacity and water absorption rate are several times larger than clay particles, or even dozens of times, so it can improve the ability of soil fertilizer and water storage, and can also improve the buffering property of soil to acid and alkali.

Promote the activity of soil microorganisms.

Improve soil nutrient properties. Humus in organic matter has a complexation effect, which helps to eliminate the pollution of the soil. For low-yield fields, increasing the content of organic matter can fertilize the soil and improve the level of soil fertility.

For high-yielding fields, organic matter needs to be replenished due to the continuous decomposition of organic matter. Humus can form complexes or chelates with phosphorus, iron and aluminum ions to avoid the precipitation of insoluble phosphate and increase the amount of available nutrients.

Summary. The principle of soil compaction is mainly the phenomenon that the soil surface layer is damaged by external factors, the soil material is dispersed, and the phenomenon of cohesion after drying is often encountered in agricultural production. Soil aggregate structure is an important indicator of soil fertility, and the destruction of soil aggregate structure leads to the reduction of soil water retention, fertilizer retention capacity and permeability, resulting in soil compaction. The content of organic matter is an important indicator of soil fertility and aggregate structure, and the decrease of organic matter leads to soil compaction.

If there is a shortage of water in the south, it is a block structure, and because they are short of water, they will have some dry leasebacks, and then, he will leak into a piece.

The principle of soil compaction is mainly the phenomenon that the soil surface layer is damaged by the structure and the soil material is dispersed under the action of external factors, and the phenomenon of cohesion after drying, which is a problem often encountered in agricultural production. The destruction of soil aggregate structure leads to the reduction of soil water retention, fertilizer retention capacity and permeability, resulting in soil compaction. The content of organic matter is an important indicator of soil fertility and aggregate structure, and the reduction of organic matter causes soil compaction.

This is one of the principles of compaction, you can take a look.

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Plants are the producers of ecosystems, which convert inorganic matter into organic matter and provide energy for other life forms in nature.

Remember--- plants absorb what is in the soil"Inorganics", such as nitrogen, phosphorus, potassium, etc.; Then, through photosynthesis, the solar energy is converted into chemical energy, and the absorbed inorganic matter is converted into organic matter to supply its own growth needs. It is itself a key link in the ecological chain, providing food for most animals.

So: there is no plant width bulk"Inorganics"so that they cannot survive. It's not"Organic matter Shen Xiang's".*Alas? I'm dizzy! Who's wrong?

Soil organic matter is related to light, atmosphere, water, temperature, microorganisms, various chemical elements, etc.

Broadly speaking, soil organic matter refers to all carbon-containing organic matter that exists in the soil in various forms, including various animal and plant residues, microorganisms and various organic substances decomposed and synthesized in the soil.

In a narrow sense, soil organic matter generally refers to a special, complex and relatively stable type of polymer organic compounds (humic acids) formed by organic residues through the action of microorganisms. Wu is blind.

Soil organic matter is an important component of the solid phase part of the soil, which is one of the main components of plant nutrition, which can promote the growth and development of plants, improve the physical properties of the soil, promote the activities of microorganisms and soil organisms, promote the decomposition of nutrients in the soil, and improve the fertilizer retention and buffering properties of the soil. It is closely related to the structure, aeration, permeability, adsorption and buffering of soil, and is usually positively correlated with the level of soil fertility under the same or similar conditions and within a certain content range.