Soil is the resource that feeds everyone and takes centuries to replace - how it forms, how it is farmed, and how it is lost.
Soils and Crop Growth
Soil is a mixture of mineral particles, organic content, gases and water, and those parts have to be in balance before a crop will grow well. This topic covers the soil p...
8 questions · 30 marks
Revise this topicFood production and crop yield
Crop yield is the mass of crop harvested from each hectare, and raising it without destroying the soil that future harvests depend on is the central challenge of food pro...
8 questions · 28 marks
Revise this topicSoil erosion
Soil erosion is the loss of the topsoil by water, wind or gravity faster than new soil can form. This topic covers its causes - deforestation, overgrazing, overcultivatio...
9 questions · 30 marks
Revise this topic