Collecting soil samples:

In this section, we briefly refer to collecting samples for

• physico-chemical analyses (loose samples for particle size distribution, CEC, EC, pH, organic carbon content, analyses,etc),
• soil-physics-related studies,
• micropedological (microscopic) studies, and
• exhibition (soil profiles)

1. Loose samples are collected from different (sub-) horizons to send to laboratory for the required physico-chemical analyses. Usually geological hammer is used to collect an amount of soil in a plastic sample collector (or a shovel), which is then poured in a plastic bag, and labeled. The amount collected depends on the number and type of analyses that are required. Normally, the orthotype (representative) profiles are sampled. Sampling is done from bottom (of the pit) upwards. This is to avoid mixing up samples of different horizons. One or two plastic bags may be used depending on where the samples have to be sent to. If the samples have to be sent to a far distance, two plastic bags (double) are used and labeled carefully. It is recommended to use two labels if the samples are sent to a far away location. One label is inserted in between the two plastic bags, and the second one (duplicated) is tagged (on the plastic bags).

Learn More from Video

Collecting Soil Samples - Part 1

The above way of sampling is meant for soil surveyors, who usually sample the whole soil pit (surface to bottom, often in several horizons) whereas fertility specialists might be interested mainly in topsoil, in which case compound sampling is recommended. Several samples that are collected from different points in a parcel are mixed, out of which one sample is taken to send to laboratory.

2. For soil physics-related analysis (e.g., permeability test) core samples are collected. The right equipment will be taken with to field (core-sampler, rings) if such sampling is planned. (see more: soil core sampling presentation)

3. Sampling for micropedological studies is done using Cubiena boxes (see the video film). Obviously, for such studies undisturbed samples are needed, meaning that one should be very careful while collecting the sample. This holds also true when sampling is meant for such test as permeability (using rings and core sampler)

4. Sampling the whole profile (monolith) for exhibition.

Learn More from Video

Collecting Soil Samples - Part 2