Basics and Facts -
What is soil? (Comprehensive review!)
More soil science terms
Understanding the soil processes
Some basics of soil
Information about soil formation, texture, structure and fertility (Good!)
Basics of soil physics
Biodiversity, soil and ecologically sustainable development
About soil health (by CanSIS)
Some soil lectures
Soil testing methods 1
Soil testing methods 2
Soil quality evaluation
FAQs about soil and plant analyses
Soil and water basics and management
Some facts about soil management
Garden soil management
Nutrient management of field crops
Nutrient management of container crops
Soils and fertilizers
Substrates and fertilizers
Fertilization and liming
How to compost?
Municipal solid waste composting
Some General Facts about Soil
Soil is a living system.
Soil contains 0.01% of the Earth's water.
Soil is 49% Oxygen, 33% Silicone, 7% Aluminum, 4% Iron, and 2% Carbon.
Fifty percent of soil is air and water. The rest is mineral and organic material.
In one gram of soil, the number of bacteria ranges from 100,000 to several billion.
There are 5000 to 7000 different species of bacteria in one gram of soil.
The total living matter in an acre (0.405 hectare) of soil ranges from 230 kg to 9 tons.
Each year, 15 tons of dry soil per acre pass through earthworms. Earthworms eat soil to get the organic materials in it. The rest passes through them.
Soil develops from geologic materials such as rocks, glacial deposits, granite, limestone, and stream sediments.
Around one acre of land is use to supply the food for each person in the world.