Certified Crop Advisor Practice Exam

Which nutrient is often a primary focus in nutrient management plans for environmental protection?

1. Potassium

2. Nitrogen

3. Phosphorus

4. Calcium

The correct answer is: Phosphorus

Phosphorus is often a primary focus in nutrient management plans for environmental protection due to its role in causing water quality issues, particularly in freshwater systems. When excess phosphorus from agricultural runoff enters water bodies, it can lead to algal blooms, which degrade water quality and can create hypoxic conditions detrimental to aquatic life. Managing phosphorus levels effectively is crucial since it is relatively immobile in the soil and can accumulate in waterways, leading to long-term environmental impacts. Best management practices often include strategies like buffer strips, cover crops, and the appropriate timing and methods of application to minimize phosphorus runoff and protect water quality. While nitrogen is also a significant nutrient of concern, particularly regarding its contribution to groundwater contamination and air quality, phosphorus tends to be a more critical factor in surface water quality issues. Potassium and calcium, while important for plant health, do not have the same level of impact on environmental protection in the context of runoff and water quality. Thus, phosphorus management is a key component in achieving sustainable agricultural practices and protecting aquatic ecosystems.