The soil structure contains both the soil structure and the soil structure. The soil particles are agglomerated into agglomerates of different sizes, shapes, and properties, called soil structures. The spatial arrangement of soil particles (including single-grained, multi-grained, and agglomerated) and their associated 7L gap condition are called soil structure. Soil testing instruments such as soil testers can also be used to measure soil structure. Other Plastic Pipe Extrusion Line Plastic Board Extrusion Line,Board Sheet Extrusion Line,Sheet Extrusion Line,Pipe Extrusion Line Hangzhou Polytech Plastic Machinery Co., Ltd. , http://www.china-wpcmachine.com
Soil analyzers can be used to analyze a variety of soils, or different layers of the same soil, often with their own specific soil structure. In the dry land, the soil-cultivated layer is often coexisted with child-type structures, and the layer structure is generally named after the dominant structure. The soil structure is the basis of soil physical properties and should be connected with the conditions that affect the soil tightness, slat gap and fertility. It is an important condition for coordinated supply of soil fertility.
First, the types, characteristics and improvements of soil-slump structures There are many methods for classifying soil structures, which are mainly divided according to the structural relationships of structures. Common soil structures are the following:
1. Block structure Nearly cubic, length, width and height are approximately equal. The diameter is generally more than 3cm, and the diameter of 1-3cm is often referred to as a core structure. The appearance is not very regular, and it is mostly generated in the soil with a lack of organic matter. Dead loess with a low degree of ripeness often has such a structure, and the farmers often refer to it as "death-leaks." As they support each other, they increase the porosity and cause the water to quickly evaporate. The massive structure has pressure seedlings. The interior of the “Lian La†is easy to dry and tight, and the water is not easy to spread. The death of dead trees in the forest nursery will make it difficult for the seeds of the seedlings to emerge, and the standing seedlings are badly rooted. The method of extermination is that it can be carried out at the time of Yu Qian’s use: After the winter soil, it can be pressed. The most fundamental way is to increase soil organic matter content and teach soil to mix sand.
2. Sheet structure The soil is arranged along the horizontal plane, the horizontal axis is longer than the vertical axis, and the interface is a horizontal flake. The plough bottom layer of farmland soil, the ash layer of forest soil, and the surface lamellae of the compacted part of the garden soil all belong to this category. The vertical cracks in the sheet structure are undeveloped and compact in the interior, which is not conducive to ventilation and permeation. The surface layer of the garden soil is too thick, which not only affects the growth of the plant roots, but also affects the ventilation and permeability, causing soil drought and soil erosion. Sandy soils often appear crusted in light loam soils, and in the upper part of the soil, there is also a consolidated layer, which is harder than crusts. The crumbling body has a great impact on plant growth, tearing the root system, and running through the wind. The best way to eliminate the sheet structure is to apply organic fertilizer to loose soil. Pedestrians in parks and street green spaces can be ventilated, planted with ground cover, or have necessary fence protection. Crusting or compaction can be achieved by adopting appropriate cultivators and organic fertilizers.
3. Columnar structure and prismatic structure arranged along the vertical axis, the vertical sleeve is larger than the horizontal axis, the soil is declared. The edges and corners are not obviously called the school-like structures, and the edges and corners are obviously called prismatic structures. The former is common in the soil and subsoil layers of the semi-arid zone. The alkaline and alkaline soil layers are the most typical; the post-exams are common in the new-heavy soils and subsoils that alternate in wet soil. One, firm and hard. The advantages of its internal voids, the roots are difficult to enter, poor ventilation, and the formation of large gaps between the structure, leaking water leakage. This type of structure can be improved through deep tillage or deep turning cultivation of green manure.
4. Aggregate structure Under the effect of humus and other external forces, the spherical or nearly spherical shape formed constitutes 7L loose soil groups. The diameter is 0.25-10mm. The soil group with a diameter of less than o.25mm is called a micro-aggregate. Someone who has a composite particle of less than o.25mm is called a familiar group. The most ideal pellet is IN 3mm diameter pellet. To improve soil structure is to promote the formation of granule structure. It to a certain extent marks the level of soil fertility. Aggregates and microaggregates are good types of soil structure.