The document discusses soil sampling procedures and methods. It describes different types of soil sampling including disturbed sampling, undisturbed sampling, random sampling, grid sampling, zone sampling, and topographic/geographic unit sampling. It provides details on sampling depths and tools for different field types such as vegetables, field crops, and orchards. Finally, it lists common soil sampling tools including shovels, augers, split-spoon samplers, and shelby tube samplers.

1. Topic: Sampling of Soil
Submitted by: Hassan Noorani
Roll No. 64
University College Of Agriculture, University
Of Sargodha

2. Soil Sampling
It commonly refers to the analysis of a soil sample to
determine nutrient content, composition, and other
characteristics such as the acidity or pH level

3. Sampling Procedure
• Field area to sample
• Time of sampling
• Sampling tools
• Sampling depth
• Amount of sample
• Sampling process
• Drying samples
• Sample I.D. and
shipping

4. Types of Soil Sampling
1-disturbed sampling
is one in which the structure of the soil has been changed
sufficiently that tests of structural properties of the soil
will not be representative of in-situ conditions, and only
properties of the soil grains can be accurately
determined

5. 2-undisturbed sampling
is one where the condition of the soil in the sample is close
enough to the conditions of the soil in-situ to allow tests of
structural properties of the soil to be used to approximate the
properties of the soil in-situ
3-Random Sampling
Uniform fields can be randomly sampled throughout the
entire field. To see long-term trends in soil nutrient data,
these points should be geo referenced with a global
positioning system (GPS) receiver and sampled in these same
locations in subsequent years.

6. 4-Grid Sampling
Two main types of grid sampling
1-Grid-cell soil sampling randomly collects either one or
multiple subsamples throughout the cell for a composite
sample
2-Grid-point soil sampling collects one or multiple subsamples
around a geo referenced point within a grid or at a grid
intersection.

7. 5-Zone Sampling
Zone sampling is a soil sampling technique that assumes that
each field contains different soils with unique soil properties
and crop characteristics, and therefore should be separated
into unique zones of management
6-Topographic/Geographic Unit Sampling
Fields vary in natural features such as elevation, hilltops,
slopes or depressions. Topographic/geographic unit sampling
assumes these features differ in soil characteristics and
therefore uses these features to establish unique zones.
2 basic types
1- area-based sampling
2-point-based sampling

8. Sampling for different Fields
1-For vegetable fields
15-30cm & 30-45cm depth is sufficient for sampling
2-For field crops
sufficient sampling depth is 45-60cm & 60-90cm
3-For orchards and gardens
sufficient sampling depth is 45-60cm,60-90cm,90-120cm
120-150cm

9. Soil samplers
1- Shovel
2- Trial Pits
3- Hand/Machine Driven Auger
4- Continuous Flight Auger
5- Split-spoon / SPT Sampler
6- Modified California Sampler
7- Shelby Tube Sampler
8- Piston samplers
9- Pitcher Barrel sample