Soil Sampling : Soil Sampling Objective To collect a soil sample that is representative of a field or portion of a field To obtain useful information about a field to make soil management decision: Nutrient management Soil problem management (Salinity & Sodicity )
Sampling a Field:: Sampling a Field: 2 basic methods/approaches Random Zone
Sampling a Field: Sampling a Field Random Suitable for uniform fields 20 cores to produce one composite sample for fields up to 10 acres. Add 10 cores for any additional 5 acres Collected in a zig-zag pattern across the field Avoid edges of field (at least 30 feet- 10 meters from all sides)
Sampling a Field: Sampling a Field Zone Recommended for fields having definite patches of low fertility, salinity or sodicity Same proceedure is to be adopted as for the Random Sampling in the non-affected area of the field to produce one composite sample. Depending on size of affected area, 5 to 10 cores to be taken to produce one composite sample.
Soil sampling technique: Soil sampling technique Equipment needed 20L Bucket Auger Spade Plastic sheet (4’x4 ft) Plow Depth 15-20 cm Soil auger Cut ½”strip from side Spade
How to take a soil sample: How to take a soil sample Sampling depth Core to a depth of 8” Sample Size 500 g soil Collect all 20 cores in a bucket or pail Mix thoroughly onto a plastic sheet Remove a composite sample of 500 g And fill into the plastic container Label properly : Circle, Grower’s name, Passbook number, Field/Plot number, date sampled and Officer’s name
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