Before sampling, we clean the surface of the sampling site from pebbles, weeds and any impurities. The sampling depth depends on the type and age of the plant. The appropriate depth for most crops is 0 to 10 cm, but sometimes for some plants with deep roots (such as alfalfa), samples are taken from a depth of 30 to 60 cm.
A sketch is the approximate shape and condition of the earth that we draw by moving on the sides of the earth. The purpose of soil sampling is to prepare a sample that represents the general characteristics of the land in question. To prepare such a sample, the sampling points must be determined correctly. Determining these points is easier and better by drawing a cropland sketch.
Soil is a dynamic and natural substance that is located on the surface of the earth. Soil is formed by physical, chemical and biological factors from bedrock over time. Its properties have gradually changed and evolved as a result of the climate and living organisms and turned into an active and living mass. In order for the soil to be a suitable environment for the growth of plants, it should be strengthened or modified according to the desired type of plant, because the soil provides the main part of water, nutrients, and air needed by plants and is a place for the establishment and growth of plant roots.
The best time to take samples from fields is one month before planting or one month after harvesting. Because during these times, the soil conditions are more stable and the obtained results are more reliable. Also, controlling and improving the soil is much easier and costs less.
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Oil contamination reduces engine life more than any other factor. As the oil passes through the surfaces of the moving parts, soot and abrasive materials are separated from these surfaces and carried with the oil.