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Anonymous users2024-02-13Soil fertility is the basic attribute and essential characteristic of soil, the ability of soil to coordinate nutrients, water, air and heat for plant growth, and the comprehensive reaction of soil physical, chemical and biological properties.
Soil organic matter generally refers to the most life-like substances in the soil. ** Soil microorganisms and soil fauna and their secretions, as well as plant residues and plant secretions in soil.
These include humic material, organic residues, and microorganisms. It is the most active part of the solid state of the soil. The content is only 1 3, but it has a great impact on soil properties.
Effect of soil organic matter on soil fertility:
1) It is the main source of soil nutrients.
2) Promote the formation of soil structure and improve soil physical properties.
3) Improve the fertilizer retention capacity and buffering performance of the soil.
4) Humus has physiological activity and can promote crop growth.
Development. 5) Humus has complexation and helps to eliminate soil pollution.
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Anonymous users2024-02-12Soil organic matter refers to the most life-like substances in the soil. In addition to soil minerals, soil can be called soil organic matter, animals and plants, microbial residues and applied organic fertilizer wax and noble materials are the main soil organic matter.
It is especially important for forest soils. Compared with agricultural soils, forest soils have the characteristics of a large amount of litter and a large tree root system.
2. Animal and microbial residues: including the remains of soil animals and non-soil animals, as well as the remains of various microorganisms. This part is relatively rare. But for primitive soils, microorganisms are the earliest forms of soil organic matter**.
4. All kinds of organic fertilizers (green manure, compost, manure, etc.) artificially applied to the soil, industrial and agricultural and domestic wheel wastewater, waste residue, etc., as well as various microbial products, organic pesticides, etc.
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Anonymous users2024-02-11Soil fertility factors include soil nutrients, soil moisture, soil air, soil heat, providing rooting conditions for plants, and the absence of toxic substances in the soil.
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Anonymous users2024-02-10Humus is the main component of soil organic matter, generally accounting for 50%-70% of the total organic matter. Composition of humus: under the action of organic matter microorganisms, a class of polymer nitrogen-containing organic compounds synthesized after transformation is newly synthesized, which is roughly divided into humin, humic acid and uterine acid.
Properties of humus: The composition of the elements mainly includes carbon, hydrogen, oxygen, nitrogen, etc., with an average carbon content of 58% and a nitrogen content of 16%, and humus is a weak acid, which can generate humate.
1. The amount of humus in the soil generally accounts for the total amount of soil organic matter
1. How much humus accounts for the total amount of organic matter in the soil.
Humus is the main component of soil organic matter, generally accounting for 50%-70% of the total organic matter. Humus refers to the organic matter formed by the decomposition of dead organisms in the soil by microorganisms, which is dark brown in color and contains some elements needed for plant growth and development.
2. Composition of humus.
Soil humus is a kind of polymer nitrogen-containing organic compounds that are newly synthesized by organic matter under the action of microorganisms after transformation. According to the solubility and color of humus, it can be roughly divided into two components: humin, humic acid and uterine acid. Hu minin is the part of humus extracted from dilute alkali solution 41.
It is tightly bound to the stripped minerals and it is difficult to separate them. Humic acid and fulvic acid are combined to be humic acid, accounting for about 60% of the total humus.
3. The properties of humus.
1) Elemental composition of humus.
The main components are carbon, hydrogen, oxygen, nitrogen, etc. Humus contains 60 carbon, average 58; nitrogen content 3-6, average 16; The ash content is:
2) The acidity and alkalinity of humus.
Humus is a weak acid that can be combined with alkaline solutions to form humate.
3) Solubility of humus.
Humic acid can form fine soil particles into agglomerates, so humic acid is an indispensable substance for the formation of water-stable aggregates. Humic acid has strong solubility, and it is not easy to form a stable aggregate structure when combined with soil particles.
4) Cohesion of humus.
Humus is generally a negatively charged organism that appears in a dispersed sol state in water, and a suitable electrolyte is added to make the colloid condense and form a gel. In the process of condensation, humus can cement the soil particles together to form a good structure.
2. The role of organic matter in soil fertility
1. It is the main source of soil nutrients, which can directly or simply provide nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and various trace elements for crop growth.
2. Weathering minerals is conducive to the effectiveness of certain nutrients. Soil organic matter is rich in a variety of organic acids and humic acids, and has a certain solubility for soil mineral parts.
3. It can provide nutrients and energy for soil microorganisms and soil animal activities.
4. Promote the formation of soil structure, improve soil physical properties, and improve soil structure.
5. The role of raising soil temperature and stabilizing the ecological environment. Organic matter is generally brown to black-brown in color, has a strong ability to absorb heat, and has a positive effect on protecting the root system of crops from cold climates.
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Anonymous users2024-02-09The most abundant element in the soil is (file) Correct Answer: c
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Anonymous users2024-02-08The most abundant element in the organic matter of the soil is (Xingchailing) Zhaozhi.
Correct answer: c
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Anonymous users2024-02-07Briefly describe the effect of soil texture on soil fertility, which texture is more powerful for fertility?
Increase fertility: Apply compost and other agricultural fertilizers with high organic matter content to increase and maintain soil fertility. 2. Reasonable crop rotation:
Cropping in the family Doujia crops is rotated every four years to increase the amount of nitrogen in the soil. 3. Increase the application of soil amendment: improve the water retention of soil and improve the adsorption performance of soil.
4. Returning straw to the field: return the chopped straw directly to the field.
Method for determining carbon black in soil: The structure of carbon black is expressed by the degree to which carbon black particles aggregate into chains or grapes. Carbon black, which is composed of a condensate consisting of the size and shape of the conglomerate and the number of particles in each condensate, is called high-structure carbon black. >>>More
Physical remediation techniques for contaminated soil include the following: >>>More
It is very difficult to grow crops such as vegetables, fruit trees or traditional Chinese medicine on hard compacted soil texture or loose sandy soil (except for a few crops, such as Polygonatum polygonatum cultivation). >>>More
You can apply more organic fertilizers, phosphate fertilizers, so that the soil is alkaline and acidic
With the progress of science and technology, people's planting and management methods are constantly improving, but soil has always been the carrier of planting, so the importance of soil is obvious, so if you want to grow well, you must ensure the fertility of the soil, and the organic matter in the soil determines the fertility of the soil. >>>More