This document provides information and guidelines for using the late spring Pre-Sidedress Nitrate Test (PSNT) to optimize nitrogen management for corn. Key points include: - The PSNT soil test is done when corn is 6-12 inches tall and helps producers decide whether to sidedress additional nitrogen or not. - Soil samples should be taken from the top foot of soil and include at least 16-24 cores from across 10 acres or less. - Applying only modest nitrogen amounts before planting allows sidedressing based on PSNT results. Over-application can be wasted or harmful. - PSNT results are provided within 24-48 hours and can help producers improve yields and