By adding compost or other organic matter.
Humus was added to it
Nitrogen enriched soil and chemicals are typically used as fertilizer to improve soil.
Foodplain
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Loess- a yellowish brown soil that blows in from a desert.
Humus was added to it
Savannah biome has a fertile soil, it has an enriched nutrients.
Nitrogen enriched soil and chemicals are typically used as fertilizer to improve soil.
It is enriched by volcanic ash.
Foodplain
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Enriched soil, water and mostly the suns rays
Loess- a yellowish brown soil that blows in from a desert.
An alfisol is an abundant soil order, with a clay-enriched subsoil and relatively high native fertility.
Enriched soil is made with fertilizer such as compost or manure. Sometimes other amendments are needed depending on the plant. Some plants need more acids, others need more alkaline. Some plants need things like zinc or calcium.
Hydroponic plants gather their nutrients from nutrient-enriched water as opposed to gathering their nutrients from soil. Soil itself is not essential to plant growth.
Human