AGRONOMIC NEWS ITEMS
From Agronomists of the
Potash & Phosphate Institute
655 Engineering Drive, Suite 110
Norcross, Georgia 30092-2837
Phone (770) 447-0335
Winter 2004, No. 4
What are appropriate uses of soil test data?
• Predict long-term probability of response to fertilization
• Determine nutrient rates to apply
Very low and low soil tests predict good chances that the crops to be grown will respond profitably to fresh nutrient applications in the short term. Soil tests kept close to critical build levels may not respond as much in the year of a nutrient application, but are expected to sustain higher production levels over time, providing positive returns to longer-term fertilizer investments.
It’s important to remember that soil tests are snapshots of soil fertility status and are used for planning nutrient applications. In most cases, soils are sampled every few years. In the interim, nutrients are applied and two or more crops are grown. In such cases, the soil test represents only an initial assessment for a string of subsequent management decisions. Sampling more frequently can help keep a better tab on how soil fertility is responding to management.
For more information on examining soil test changes over time, visit >www.ppi-ppic.org<. Under “Features”, select “Toolbox Resources”.
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