Which two nutrients are primarily focused on in the manual?

• A. Nitrogen and potassium
• B. Nitrogen and phosphorus
• C. Phosphorus and potassium
• D. Calcium and magnesium

Answer: (B)

Nitrogen and phosphorus are the nutrients most emphasized in the manual because they have the biggest impact on both crop performance and environmental protection. Nitrogen directly drives vegetative growth and yield, but if applied in excess or at the wrong time, it can easily move beyond the root zone, contaminating groundwater or contributing to surface runoff. Phosphorus is essential for early root development and strong establishment, yet it is a major contributor to water quality issues if it leaves fields, so the manual focuses on accurate testing, appropriate rates, and careful placement to prevent losses. Potassium, while important for overall plant health, is addressed as part of general nutrient management after the primary focus on nitrogen and phosphorus. Calcium and magnesium are also needed but are considered secondary nutrients in the typical certification material. Therefore, the manual centers on nitrogen and phosphorus as the two nutrients most critical to both production and environmental stewardship.