Pre-Sidedress Nitrate Test for Corn (PSNT)

The Pre-Sidedress Nitrate Test is a soil nitrogen test that is designed to provide assistance in making agronomically and environmentally sound nitrogen recommendations for corn. The PSNT is especially useful in systems where manure has been applied because it eliminates some of the uncertainty associated with utilizing manure N.

To use the PSNT, 12 inch deep soil samples are taken when the corn is at least 12 inches tall. Samples must be dried immediately and sent to the laboratory. These samples are analyzed for nitrate-nitrogen and, based on this result and information on the expected yield and history of the field, a sidedress nitrogen recommendation is made. This test is currently available only for corn and the grower must be able and willing to apply any recommended nitrogen to the growing crop( i.e. sidedressing).

Service Fees

Pre-Sidedress Nitrate Test $6.00

Fees effective 7/01/2012

Submitting Your Sample

To use this program, print a PSNT information sheet from this website or acquire a PSNT information sheet from a county office of Penn State Extension. Submit the completed form with your sample to the laboratory in your own sample container. Payment of $6.00 per sample (check made payable to Penn State University) must accompany sample(s). The results for nitrate-nitrogen along with recommendations will be telephoned, faxed or emailed to the grower or designated individual within 24 hours of receipt by the lab.