Some people have asked: If there is a piece of land to be planted and greenery is to be planted, a salt test should be performed on the soil before construction. The test method I have already mastered, but it is unclear how the soil should be sampled in order to ensure high accuracy. What about sex? Do you want to test the depth of soil? Xiao Bian collected that the salinity change in saline-alkali soil was greater than the change in soil nutrient content. Soil salinity analysis not only needs to understand the amount of salt in the soil, but also is usually through the soil in situ salt content meter to understand the salt changes. The difference in salinity is important information about saline-alkaline soil. In such cases, mixed samples cannot be used. The change of salinity in saline-alkaline soil is more obvious in the vertical direction. Due to leaching and evaporation, the salinity in the soil profile changes greatly, and in different types of saline soil, the distribution of salt in the profile is different. For example, in the southern coastal saline soil, the subsoil contains more salt, while in the inland secondary saline soil, the salt generally accumulates in the surface layer. According to the law of salt changes in the soil profile, soil samples should be taken in layers. Although sampling of soil nutrient analysis also considers sampling season and time, its impact is far less than that of saline-alkali soil. Due to the particularity of the distribution of alkali spots in flower-alkaline soils, it is necessary to increase the density of the spots and the random distribution of the spots, or to estimate the percentage of the spot in the whole plot, and to allocate the number of spots to be taken on the plaque proportionately. , Make up a mixed sample; this patch can also be combined to form a mixed sample for comparison with normal soil. I hope that the above collection can help this friend. Seamless Steel Pipe For Hydraulic Cylinder
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Stratum sample collection, do not have to sample according to the level of occurrence, and a soil sample is collected every 10cm or 20cm from the ground surface. The sampling method uses “segment extractionâ€, that is, in the sampling layer, the whole layer is uniform from top to bottom. To take the soil, which is conducive to the calculation of salt storage. When studying the distribution of salinity in the soil profile, “points†are often used, that is, the soil is taken in the middle of the sampling layer. According to the characteristics of saline soil sampling, special attention should be paid to the time and depth of sampling. The movement of salt up and down is greatly affected by leaching and evaporation at different times.