On younger substrates, especially of Volcano origin, tropical soils may be quite fertile.

Human activity is thought to account for 30%; tropical soils and oceanic release account for 70%.

Approximately a third of all tropical soils are too acidic to support traditional food crops.

Until recently, for example, soybeans were not thought to flourish in tropical soils and climates.

Of particular importance is the effect that deforestation has on tropical soils.

The accumulation of organic matter in moist tropical soils is a paradox, because of optimum conditions for degradation.

Especially for tropical soils BC serves as a reservoir for nutrients.

Terra preta, fertile tropical soils created by adding charcoal.

This holds especially true for highly weathered tropical soils.

Was there something in tropical soil that required plants to develop gum as a defense against pests?