Soil Sampling

An acre of soil to a 6-inch depth weights about 2,000,000 pounds, yet less than 1 ounce of soil is used for each test in the lab. Therefore, it is very important that the soil be representative of the entire field.

Over 200,000 soil samples are analyzed in WI each year, and the results of these tests guide WI farmers in the use of nutrient applications and lime. The appropriate use of these items, along with manure and other nutrient sources can significantly increase WI farm income. Just as importantly, following nutrient application guidelines prevents over-application of nutrients. This, in turn, enhances profitability and reduces the potential for environmental degradation.

The underlying goal of WI's recommendation program is to supply enough nutrients to the crop for optimum growth throughout the season.

A few specific goals of WI's soil testing program are...
1) Indicate the degree of nutrient deficiency that may exist for the various crops grown.

2) Estimate the amount of nutrient that should be applied to provide the greatest economic return to the farmer.

3) Monitor the changes in nutrient status of the field over time.


When ready to sample...
1 sample/5 acres, with each sample containing 6-8 (6 in deep) cores.
A W-shaped sampling pattern across the field works well.
Place all cores in a bucket, mix, and fill soil bag to recommended amount.

Avoid sampling...
Dead furrows
Manure Piles
Near fences and roads
Banded fertilizer rows
Eroded knolls
Low spots
Where stalks or bales were stacked
Headlands

Contact our local Land Conservation Office for field maps, soil bags, probe rental and shipping of samples to the lab.