We consult with dairy farms in Northeast US, and, here as elsewhere, too much N is often applied so that yields will not suffer from lack of available N. We use the pre-sidedress nitrogen tests to assess soil N supply at V4 - V6, and also the corn stalk nitrate test at harvest to assess whether maize had been supplied with sufficient N. We are looking for practical tests to use to advise our farmer clients.
Richard Dale
We are looking at technology associated with Trimble and John Deere Greenseeker for use with a ground-driven array of sensors that then compare areas of fields that are known to have more than sufficient N from a previously-applied high rate of fertilizer to establish a baseline then using an algorithm to establish N to apply.
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