World Soil Day: Why Healthy Soil Matters (December 5)

The food on your plate, the cotton in your shirt, the water in your tap and even the medicines in your cabinet all depend on a thin, living layer beneath our feet. World Soil Day, held every year on December 5, celebrates soil and calls for its sustainable management — because healthy soil is the foundation of life on land.

Why Soil Deserves Its Own Day

Soil fact	Why it matters
About 95% of our food is produced directly or indirectly on soil	Soil health is food security
Forming just 1 cm of topsoil can take hundreds to a thousand years	Lost soil is practically non-renewable in a human lifetime
Around one-third of the world’s soils are degraded	Erosion, salinisation, compaction and pollution threaten harvests
Soils store more carbon than the atmosphere and all plants combined	Protecting soil helps fight climate change
A single handful of healthy soil holds billions of microorganisms	Soil is one of the most biodiverse habitats on Earth

Figures are based on FAO estimates and widely cited soil science references.

History of World Soil Day

In 2002, the International Union of Soil Sciences (IUSS) recommended an international day to celebrate soil. The Kingdom of Thailand, supported by the FAO’s Global Soil Partnership, led the campaign to make it official. The FAO Conference endorsed the idea in June 2013, and in December 2013 the UN General Assembly designated December 5, 2014 as the first official World Soil Day.

The date honours the birthday of the late King Bhumibol Adulyadej of Thailand, who championed soil conservation and land development projects throughout his reign.

Year	Event
2002	IUSS recommends a world day for soil
2013	FAO Conference endorses; UN General Assembly designates December 5
2014	First official World Soil Day
2015	International Year of Soils
2016	FAO launches the King Bhumibol World Soil Day Award
Every year	FAO announces a new theme and Glinka World Soil Prize honours

What Is Soil Made Of?

Component	Approximate share in a healthy soil
Minerals (sand, silt, clay)	About 45%
Water	About 25%
Air	About 25%
Organic matter and living organisms	About 5%

That tiny 5% of organic matter does a huge job: it feeds plants, holds water like a sponge, binds soil particles together and stores carbon.

The Biggest Threats to Soil

• Erosion by wind and water, often after forests are cleared or land is overgrazed.
• Loss of organic matter from intensive ploughing and burning crop residues.
• Salinisation caused by poor irrigation in dry regions.
• Compaction from heavy machinery, which stops water and roots from moving.
• Pollution from industry, plastics, excess fertilisers and pesticides.
• Sealing — covering fertile land with concrete and asphalt as cities expand.

How Farmers and Gardeners Protect Soil

Practice	Benefit
Cover crops	Protect the surface and add organic matter
Crop rotation	Breaks pest cycles and balances nutrients
Minimum or no tillage	Keeps soil structure and fungi intact
Composting and manure	Feeds soil life and improves fertility
Mulching	Reduces evaporation and erosion
Agroforestry and terraces	Hold soil on slopes and add shade and nutrients

Things You Can Do on World Soil Day

• Start a compost bin for kitchen and garden waste.
• Plant something — a tree, a herb pot or a native wildflower patch.
• Avoid leaving garden soil bare over winter; use mulch or leaves.
• Cut food waste: every wasted meal wastes the soil that grew it.
• Teach children with a simple “soil jar” experiment to see sand, silt and clay settle.
• Buy from farmers who use soil-friendly practices.

“The nation that destroys its soil destroys itself.” — Franklin D. Roosevelt, 1937

👉 Same day: International Volunteer Day — December 5

👉 Grow with us: More environment and nature days

Frequently Asked Questions