the Purpose of taking the soil sample determines the order of selection
There are many soil characteristics that are visually impossible to determine. With the aim of obtaining these characteristics, the selected soil sample to bring it to the lab and perform the necessary to determine the experiences and trials.
the Information you want to obtain, examining the soil, determines the type of sample. A soil sample could be:
- of undisturbed structure.
On samples of disturbed structure, you can define the following characteristics:
- particle size distribution;
- the limits of plasticity;
- natural moisture (for this sample is tightly Packed).
According to the samples of undisturbed structure to define:
- physical and mechanical properties of soils;
- strength indices;
- deformation parameters.
a Soil sample of undisturbed structure is called a monolith. It is taken from wells with the help of the sample holder. To determine the physical properties is the monolith with a height of 10 cm. Conduct compression testing requires the cut of the monolith with a height of 25 cm.
As packaged soil samples?
a Sample of undisturbed structure needs to be preserved in the transportation of all your properties. For this purpose it is carefully Packed. The sample holder is extracted from the column soil carefully align the top and bottom, cut edge of the top and make the top part of the incision, indicating the top. Then the soil sample is wrapped in cheesecloth and parafruit.
Samples of disturbed structure placed in the bags. If you plan on determination of natural moisture of soil, the portion of the sample placed in box, the top of which parafruit to prevent losses of moisture. The sample volume of the damaged structures is also important. To determine particle size distribution, it is sufficient to select one standard bag. When you want to determine corrosiveness of the soil to the steel by the mass loss of the sample, the sample shall contain sufficient material. A sample of soil taken at the depth of the strip structures in the amount of half to two kilograms.
All samples are provided with labels. The label indicates the number of generation depth of selection, date and signature of the engineer. Also the label should have information from any object taken as a sample. These data are necessary in order to avoid confusion in the lab, where we study a large number of samples.
a soil Sample for soil research
the company "Guild Engineering" carried out various analyses of the soil. Can be determined the residual quantity of pesticides, metals, nitrates. Define agrochemical parameters - plant-available phosphorus, potassium, acidity and nitrates.
the soil Sample can be a spot sample taken from a single location, or the combined sample (mixture of two spot samples and more, the mass of such sample is not less than kg). If You are planning to apply the fertilizer evenly throughout the area, collect samples randomly within the plot. Chemical analysis of the soil will help to establish the fertilizer rate.
For the selection of pooled samples in the fields the best time is between spring and autumn when the vegetation does not interfere with sampling. Spring soil samples taken before applying fertilizers. The selection of the mixed sample to apply the method of "envelope" by taking the samples at the corners and center of the selected area. In the study of pollution taken soil samples on test sites. Depth, number of samples, the way in which must be Packed in a soil sample depends on the objectives of the study.