Which of the following is NOT a routine analysis for manure?

In the context of routine analysis for manure, the correct choice indicates that calcium is typically not included as a primary element in standard analysis protocols. Routine analyses are generally focused on macro and micro nutrients that are most critical for understanding the nutrient content and fertility implications of the manure, specifically nitrogen (N), phosphorus (P), and potassium (K).

Total nitrogen, phosphorus as P2O5, and potassium as K2O are fundamental components assessed during manure testing to determine its nutrient availability for crops. These elements are essential for plant growth and are closely monitored to ensure proper nutrient management practices.

While calcium is an important nutrient for plant health and is often found in manure, it is not usually part of the standard routine analyses primarily focused on N-P-K dynamics. In many situations, testing for calcium may be done based on specific crop needs or soil tests rather than as part of routine manure analysis. This emphasis on N, P, and K for routine testing is established to provide farmers and nutrient managers with essential information for effective nutrient applications and to comply with regulations concerning nutrient management.