Variable Rate Nitrogen Prescriptions
There are many ideas and methods available today about creating variable rate Nitrogen rates. Agronomic Solutions has worked with several methods and uses a few in particular to create VRN prescriptions. One of these is utilizing historical yield data to determine high yielding versus low yielding areas in a field and combining that data with organic matter readings. Another method is using soil types and CSR ratings to assign rates that correspond to productivity zones within a field.

ISNT Nitrogen Management Sampling
This is a new method for determining N mineralization variability in a field. Cores are taken at a depth of 12”. Agronomic Solutions has sampled by this method on soil type basis for determining a Nitrogen recommendation.

Late Spring Soil Nitrate Test
This is used to look at a snapshot in time. The test is taken in late May to early June to determine if more Nitrogen is needed. Weather conditions and rainfall can greatly affect the accuracy of this test.

End of Season Stalk Nitrate Test
The end of season stalk nitrate test is based on the nitrate content of an 8 inch section of stalk cut from 6-14 inches above the soil surface. The sample is taken after blacklayer maturity.  Test results indicate how much nitrogen was available to the plant.