Dairy One Pre Sidedress Nitrogen Testing and Guidelines
Pre Sidedress Nitrogen Testing (PSNT) is used to determine if sidedress N is needed on corn with a history of manure or sod incorporation. The PSNT measures potentially mineralizable organic N in the soil to determine the likelihood of a yield response from sidedressed
PSNT's should be run on corn fields two or more years after sod plow down where the manure rate is uncertain or may not meet the N requirements of the crop. A PSNT should also be run if N mineralization rates are expected to be higher than average (e.g., warm moist spring).
PSNT's should not be run on corn fields that had broadcast N applications pre plant or early post plant since nitrate picked up from broadcast fertilizer could overestimate true N mineralization potential.
PSNT's should not be run on first year corn after a grass sod with starter N since a response to sidedressed N is very unlikely unless the soil has a very high yield potential (Hamlin, Genesee, etc).
PSNT is not needed for first year corn following an alfalfa grass mixture since a response to sidedressed N is highly unlikely.
2-3 days after significant rainfall (due to nitrate leaching).
5. Sample between rows taking care to avoid the starter band.
to a depth of 12 inches.
the sample immediately to stop mineralization and send the
8. Pick up points are available in some areas.
Dairy One Customer Service to find out if there is a pick up
10. Dairy One will report results within 24 hours after receiving your samples if they arrive Monday thru Friday.
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