Agronomy Degree Practice Exam

What should a crop producer do to determine how much fertilizer to apply to a field?

1. Texture the soil

2. Sample the air nutrient content

3. Test the fertilizer nutrient content

4. Test the soil nutrient content

The correct answer is: Test the soil nutrient content

To determine how much fertilizer to apply to a field, testing the soil nutrient content is essential. Soil testing provides valuable information regarding the current levels of macronutrients and micronutrients present in the soil. This data enables the crop producer to assess the nutrient requirements of the specific crop being grown and to tailor fertilizer applications accordingly. By understanding the existing nutrient levels, the producer can prevent over-fertilization, which can lead to environmental issues such as nutrient runoff, as well as under-fertilization, which can limit crop yields. Soil tests typically provide recommendations for macronutrients like nitrogen, phosphorus, and potassium, and often include suggestions for lime or other amendments if necessary. While texturing the soil, sampling air nutrients, and testing fertilizer nutrient content can play roles in an overall agronomic management strategy, they do not directly address the immediate need for understanding soil nutrient availability, which is critical for effective and efficient fertilization practices.