The abundance of modern agriculture rests on a foundation that is more fragile than the steady supply of food on store shelves suggests. Fertilizers, which dramatically increase the yields farmers can coax from their land, are produced through concentrated and energy-intensive processes, and disruptions to their supply or spikes in their cost ripple through to the price and availability of food, leaving the global food system vulnerable in ways that are not always visible.

The dependence of contemporary farming on fertilizer is profound. The capacity to feed a global population of billions owes much to the synthetic nutrients that replenish the soil and allow it to produce far more than it otherwise could. Without these inputs, yields would fall substantially, and the land required to produce the same amount of food would expand enormously. This reliance means that the cost and availability of fertilizer are tightly linked to the cost and availability of food itself.

The production of fertilizer carries vulnerabilities that are easy to overlook. Manufacturing the nitrogen-based fertilizers central to modern agriculture is highly energy-intensive, tying their cost closely to the price of the energy used to produce them. When energy prices spike, so does the cost of fertilizer, raising farmers’ expenses and ultimately the price of food. Other essential nutrients are mined from deposits concentrated in particular regions, creating dependencies similar to those affecting other critical minerals and exposing supply to disruption from a limited number of sources.

These vulnerabilities have translated into real consequences. Episodes in which energy prices surged or supplies from key producers were disrupted have driven fertilizer costs sharply higher, squeezing farmers and contributing to higher food prices. When fertilizer becomes too costly, some farmers apply less, which can reduce yields and tighten food supplies in subsequent seasons, propagating the disruption forward in time. The effects fall hardest on the poorest, for whom food represents the largest share of spending and for whom price increases can mean hunger.

The concentration of production compounds the fragility. The capacity to manufacture fertilizer and the deposits of the minerals it requires are not evenly distributed, and reliance on a limited number of producers and sources means that disruption, whether from conflict, policy, or other causes, can constrain supply for many who depend on it. The global nature of the trade means that a shock in one place can affect farmers and consumers far away, transmitting through markets that link distant producers and users.

The connection between fertilizer and food security has drawn growing attention as the fragility of the system has become apparent. The recognition that food supplies depend on inputs whose production is concentrated, energy-intensive, and vulnerable to disruption has prompted interest in building more resilient supply chains, developing more efficient methods of using fertilizer, and exploring alternatives that reduce dependence on the most vulnerable inputs. These efforts confront the difficulty of altering a system on which the feeding of billions depends.

The fragility of fertilizer supplies illustrates how the apparent abundance of modern food production rests on inputs and processes that are themselves vulnerable, and how disruptions far removed from the farm or the store can translate into higher prices and tighter supplies. As the global population grows and the pressures on food systems intensify, the security and affordability of the inputs that underpin agricultural abundance will remain a quiet but consequential factor in whether the world can feed itself reliably and affordably.