Formulation knowledge – composition of a base suspension fertilizer A “base suspension fertilizer” formulation is commonly designed to contain which approximate analysis (by percent of plant nutrients)?

Introduction / Context:
Suspension fertilizers are fluid products stabilized with fine solids or clay to hold high nutrient concentrations. “Base suspension” refers to a high-analysis N–P fluid, often used as a stock to which potassium solutions or micronutrients can be added for field-specific blends.

Given Data / Assumptions:

• Common analyses include high P2O5 from superphosphoric acid with moderate N from ammonia.
• Notation uses oxide forms (P2O5, K2O) as is standard in fertilizer trade.
• The question seeks the typical iconic base analysis.

Concept / Approach:
Base suspensions historically align with analyses around 13-43-0 (N–P2O5–K2O), produced by neutralizing superphosphoric acid with anhydrous ammonia in the presence of suspension agents. The high P content improves logistics by reducing water and trucked volume. Other analyses presented either invert the N–P balance unrealistically or list extreme K2O contents inconsistent with base N–P suspensions.

Step-by-Step Solution:

Verification / Alternative check:
Ag retail references list base suspensions near 11-37-0 to 13-43-0; farmers then blend K sources (e.g., KCl solution) if required.

Why Other Options Are Wrong:

• 43% N: Uncharacteristically high for fluid suspensions; viscosity and safety issues.
• Options with K2O: A base N–P suspension typically has no K2O until blended.

Common Pitfalls:
Confusing suspension fertilizers (which may be opaque and thick) with clear solution fertilizers; suspensions allow higher nutrient loading.

Final Answer:
13% N2 and 43% P2O5