Soil solution is the most active part of the soil. Apart from providing mineral nutrition directly to the crop, it also participates in the process of soil formation, and plays an important role in soil microbial activity and soil physical and chemical reactions. Soil solution and soil are just as important as blood and animals. Therefore, studying changes in soil solution is of great significance for understanding soil health, solving soil pollution, and achieving refined soil management. The suction-pressure soil solution sampler is a specialized instrument for sampling soil solutions. This instrument is an essential part of the process of studying soil solution changes.
The soil solution is present in the soil. Any change in the composition of the soil will affect the concentration and composition of the soil solution. In addition, rainfall, temperature changes, biological activity in the natural world, and agricultural measures such as fertilizing irrigation will also lead to The soil solution changes. The application of a suction-pressure soil solution sampler found that the following factors affect the soil solution change.
1, the soil temperature
The change of soil temperature is the main factor causing the change of soil solution concentration and composition, because many inorganic salts will increase their solubility as the temperature increases, but the increase range of different substances is not the same. When the temperature is different, the solubility of the gas in the soil solution is also very different, especially the solubility of oxygen, carbon dioxide, affecting a variety of changes in the soil.
2, soil moisture
With the increase of soil moisture, the concentrations of nitrates and the like continuously decrease, indicating that all of these soluble salts are present in the soil solution, thus affecting the concentration and composition of the soil solution.
3, biological activities
During the growth of plants, many nutrients, especially nitrates, are absorbed from the soil solution, and the absorption of various nutrients is not balanced. Furthermore, due to the different stages of development of the crop during the growing season, the nutrients absorbed are also different. During the growth period, the concentration and composition of the soil solution caused by plant uptake are constantly changing.
The above are the major factors affecting soil solution changes by applying a suction-pressure soil solution sampler. In addition, the composition of soil solution is often affected by bio-climates, soil parent materials, tillage, fertilization, irrigation and drainage, etc. Change frequently. The use of a suction-pressure soil solution sampler to extract soil solutions and develop soil studies not only enables dynamic monitoring of soil solutions, but also provides important guidance for soil conservation and quality improvement, and promotes ecological agriculture and efficient agriculture. development of.
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