Producers of corn-soybean rotations looking to fine-tune nitrogen applications won't find more precise tools than the pre-sidedress and preplant nitrate tests. Recommended by the University of Minnesota for decades, the PPNT is conducted before planting and can help make fertilizer application choices upfront. PSNT is done in the most active part of the growing season. Brad Carlson, University of Minnesota Extension educator based out of Mankato…
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