NDSU Extension Service - Williams County

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Early Fall Soil Testing Suggested - Hay Forage Crops Can Be Poisonous

It has been a practice to delay the collection of soil samples for nitrogen tests until mid to late September. The reason for waiting is the fear additional nitrogen will be made available through mineralization and not show in the test results. Dr. Dave Franzen, NDSU Soil Specialist, tells us soil nitrate levels change very little and sampling can take place immediately after harvest with no sampling date adjustment necessary.
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