Briefly describing the soil structure of natural soil

The soil structure refers to the vertical cross-section of the soil from top to bottom, and the way in which many soil layers are arranged and combined. In the process of soil formation, the material in the soil is also changing. Moves and deposits are generated, so that the soil level distribution from top to bottom, forming a certain cross-sectional morphology, under different soil conditions, the material movement characteristics in the soil is different, the resulting profile is also different. These morphological characteristics mainly refer to the soil's color, texture, structure, compactness, new body, invasion of human body, hydrochloric acid reaction, and PH value. By understanding the soil structure, we can understand the effects of soil-forming factors on soil formation processes and fertility characteristics.
The process of soil formation is relatively short. The level of the soil is not very obvious, and there are only extremely thin soil layers. However, in the deep development of soil in the formation of soil body towels, the level of differentiation is obvious.
The profile of natural soils can generally be divided into the following levels:
1. Ao layer is the dead call down layer. In the woody plant community, the uppermost soil is the most obvious. The upper part of this layer is loose debris, and the lower part is the decomposition layer of the residue that is basically decomposed but the original shape is visible and mixed with a small amount of soil particles.
2.A floor is the shower floor. This Nepal can be divided into two layers of Al and A2. The A1 layer is densely rooted, rich in organic matter and mineral nutrients, has a good granule structure, dark color, and good soil permeability; A 2 Ni is a leaching layer comparable to the standard Huai, often subjected to rain showers. So that soluble salts, organosols, and hydrates of iron and aluminum are removed by Lin, nail machines and inorganic nutrients are reduced. Powdery sandy. Gray and white. The woody plant community is a typical ash layer.
3.B layer is the deposition layer. A layer of leaching down the shopping quality deposited in this layer, texture relative to the drum, cracks can occur when dry. Temperate forest area with iron-containing aluminum Figure 1 - natural sub-state 6 sub-machine and inorganic limbs can be moved from the A-layer to the D-layer, forming a hard disk. Moisture penetration is difficult. This layer is not due to leaching strength, deposition conditions are different, generally rich mineral nutrients. The lower part of the B-layer, often due to catch the original circle for the change of A6 still empty gray sign. It is called the latent blind (or gray excited) layer, or G layer for short. The layer B often has young bodies such as sand ginger.
4.C layer is the parent layer. Under the B layer, without leaching and deposition, a small amount of root system was basically not affected by the process of soil formation and was a layer of soil.
5.D is the parent rock formation. It is a semi-weathered and weathered rock layer with rare root systems. In agricultural soils, the surface layer is a cultivation layer where man is cultivated and cultivated, and the apricot organics and mineral nutrients are abundant. Underneath it is a plow bottom layer, which is formed by compaction of agricultural cultivation and downward movement of grains. It has a clear boundary with the tillage layer, and it has a layered or flaky structure. The content of the commercial plough is low, tight, and the porosity is low. Poor permeability. Below this layer is the heart and soil layer, is the original natural soil layer B, plays the role of water retention and fertilizer, although the root system of this layer is less, but the water and fertilizer supply in the later stage of crop growth. In the original parent layer, it was not affected by human cultivation. It was not able to provide much nutrients, it was compact, there were few root systems, and it was raw soil or dead soil. It was often called the subsoil layer.
Soils within the garden range are formed on the basis of natural or agricultural soils under the influence of more intense human influence. The soil conditions are more complex but still have regularity. Squares, street green areas, parks (Tan temples, temples, temples, government buildings, and government buildings are opened as parks) and new tourist attraction green spaces are mostly designed to meet people’s spiritual and cultural needs. They are based on natural or agricultural soils. Artificial pile, backfill, compaction, the upper part of the soil or back to the soil 20-100cm or more deep, the original undisturbed soil. The other type is undisturbed soil. The common feature of the main tourist green areas is that there is a compacted surface layer 5-20cm thick. The surface leaves are mostly removed due to the need for sanitation and fire safety. According to the data measured by the soil nutrient speedometer, this layer of nutrients can be seen. It is much lower than natural forest soils and has poor permeability. The general rule of the lower soil layer is that the leopard grains are obviously moved down and the nutrients are lower than the upper layer. Because of the heap padding and backfilling, soil nutrients are often higher than the lower layer.

Learn more about soil testers and other soil testing instruments to help you understand more about soil composition.

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