How is the expected total amount of fertilizer defined?

The expected total amount of fertilizer is defined as the calculated fertilizer amount based on the target rate. This is because the target rate is determined based on the crop's nutrient needs and the soil's nutrient availability. By calculating the amount needed to meet these requirements, applicators ensure that they apply the correct level of nutrients necessary for optimal plant growth and yield.

This approach also allows for considerations such as soil type, crop type, and expected yield, which helps in formulating a sound fertilization strategy. By focusing on the target rate, fertilizer applicators can maximize efficiency and reduce waste, ensuring that the plants receive the appropriate nutrients while minimizing the potential for environmental impact due to over-application.