Testing the growing plant for nutritional deficiency allows time for foliar application or adjustment in fertility programs. Stalk nitrate is a post yield check to assess the usage, or over usage of Nitrogen.
Illinois (Livestock Management Facilities Act 900.511) requires quarterly testing of perimeter tile water. If you have a LF number, call to see how we can help you with compliance.
Manure is a valuable commodity. Understanding the fertility content of applied manure can reduce your need for commercial fertilizer.