Our dependence began in the mid-19th century, after farmers noticed spreading phosphorus-rich guano ... We could reinvent a modern phosphorus cycle simply by dramatically reducing our consumption.

Fertilizers are sold with specific formulas on the container that denote the percentages of the three macronutrients that the fertilizer is guaranteed to contain.Tropical Bat Guano has an analysis ...

For some time after the earth's formation, the phosphorus cycle in the sea was simple, ... fossil fish or guano deposits. With the development of agriculture in historic times, ...

Guano is relatively naturally balanced, with appropriate levels of nitrogen, phosphorus, and potassium — three key elements for growing that good growers keep tabs on at all times.

Every year, colonies of thousands of seabirds deposit tons of nitrogen and phosphorus through their excrement, known as guano, playing an important role in the nutrient cycle of coastal regions ...

The largest reserves of marine phosphorus in the world were piled into mesas more than 150 feet high on the Chincha Islands off Peru’s southern Pacific coast. For most of the 19th century, it ...