It’s hard to get much more “natural” than elements found in nature. Take, for example, Nitrogen, Phosphorus and Potassium: N, P and K. So it's odd that these elements-the three most common crop nutrients are so often deemed as unnatural or inorganic. Fact is N, P and K exist naturally. The only problem is they are seldom in a place, or a form, that's readily consumable for crops. What crop nutrient suppliers do is harvest these nutrients from nature and make them absorbable for plants.