The amount of both P and K fertilizer applied to US farmland has increased dramatically since 1980 as American farmers attempt to maximize profits and meet record demands for food.

Question

Quizplus · Accepted Answer

While the use of nitrogen fertilizers has increased significantly, the application rates of phosphorus (P) and potassium (K) fertilizers have remained relatively stable or even decreased since the 1980s. This is due to improved management practices and a better understanding of soil nutrient needs.

The Amount of Both P and K Fertilizer Applied to US