Certified Crop Advisor Practice Exam

What are the keys to reducing fertilizer nitrogen entry into water bodies?

1. Maximize crop competition and minimize irrigation

2. Maximize crop uptake and minimize loss pathways

3. Minimize fertilizer use entirely

4. Maximize synthetic fertilizers and minimize legumes

The correct answer is: Maximize crop uptake and minimize loss pathways

The key to reducing fertilizer nitrogen entry into water bodies involves maximizing crop uptake and minimizing loss pathways. Focusing on maximizing crop uptake ensures that the plants absorb as much nitrogen as possible, thereby utilizing the applied fertilizer effectively. When crops are healthy and thriving, they can take in higher levels of nitrogen, reducing the amount that remains in the soil and could potentially runoff into waterways. Minimizing loss pathways is also crucial. This includes reducing leaching, runoff, and volatilization, which are common ways nitrogen can escape from the soil and enter water bodies. Implementing practices such as proper timing of fertilizer applications, using appropriate application methods, and considering weather conditions can significantly mitigate these loss pathways. In contrast, other choices may not effectively address the broader issue of nitrogen pollution. For instance, entirely minimizing fertilizer use could lead to insufficient nutrient availability for healthy crop growth, potentially impacting yields and overall agricultural productivity. Maximizing synthetic fertilizers while minimizing legumes can lead to increased nitrogen entry into water systems, as legumes have the natural ability to fix atmospheric nitrogen and can reduce the dependency on synthetic fertilizers. Therefore, maximizing nitrogen uptake by crops alongside minimizing the pathways through which nitrogen can be lost is essential for sustainable practices that protect water quality.