Biological components of the soil

////Biological components of the soil

Biological components of the soil

Worms are part of the soil's biological components. Image credit wageingenur.nl

Worms are part of the soil’s biological components. Image credit wageingenur.nl

ZIMSEC O Level Combined Science Notes: Biological components of the soil

  • In addition to physical components the soil also has biological components as well
  • These include living plants, animals and dead organic matter
  • Some of these active and useful organisms found in the soil are microscopic
  • These are known as micro-organisms
  • They include bacteria and fungi
  • These micro-organisms break down dead animals and plants
  • During this decay/decomposition process nutrients are released into the soil
  • These nutrients include mineral salts such as phosphates and nitrates as well as are mineral elements required in plant growth and development
  • If there is high organic content in the soil the soil is called fertile
  • It will support healthy plant growth
  • The biological component of the soil play important roles in the life of the soil and the whole ecosystem
  • The fertility of the soil is improved by the action of micro-organisms on dead organic matter in the soil
  • The organic matter is broken down slowly to become part of the soil in the form of humus
  • The organic matter itself and the action of the micro-organisms improve the aeration of the soil
  • Worms and insects make burrows in the soil which allows air to penetrate more easily
  • The soil particles are also held together by the organic content which improves the texture of the soil
  • The particles are held together much more loosely with air spaces
  • This makes the soil lighter and easier to cultivate
  • Loamy soils are said to have a god crumb structure which makes them suited to agricultural activities

To access more topics go to the Combined Science Notes page.

By |2017-01-17T11:15:22+00:00February 28th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|Comments Off on Biological components of the soil

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He holds an Honours in Accountancy degree from the University of Zimbabwe. He is passionate about technology and its practical application in today's world.
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