What does calibration help ensure in fertilizer application?

Calibration in fertilizer application is crucial because it helps ensure that nutrients are evenly distributed across the area being treated. When a fertilizer spreader is calibrated correctly, it applies the right amount of fertilizer at the appropriate rate, which is essential for achieving uniform coverage. This uniform distribution prevents areas of the soil from becoming nutrient-deficient or overly saturated with nutrients, both of which can lead to poor plant growth or environmental runoff issues.

Proper calibration takes into account factors such as the type of fertilizer being used, the size of the area, and the application rate recommended based on soil tests. This process allows for the effective use of fertilizers, promoting healthy plant growth and maximizing the benefits of fertilization while minimizing waste and potential environmental harm.

Other options, such as ensuring optimal soil temperature, using only organic fertilizers, or preventing overwatering, do not directly relate to the purpose of calibration in fertilizer application. Calibration is specifically about the accurate and even distribution of nutrients, making it integral to effective fertilization practices.