soil basics

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1. which of these is not a reason soil is important...

  • it directly feeds many organisms
  • its provides a good engineering medium for roads and buildings, etc.
  • it regulates water flow
  • it stores water for plants to use
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2. how does water exist in soil

  • hydroscopic water, capillary water and available water
  • it doesn't
  • fills the pores
  • keeps air out

3. soil can be used as a sink because..

  • it is able to conver the soil into inert carbon which is easily and quickly put back into the atmosphere
  • it allows slow decomposition of soil carbon if it is not disturbed, this is through fauna respiring it and converting the rest into modified soil carbon - keeping the carbon from the atmosphere for a longer time. some carbon can be further decomopsed
  • it is ploughed so can move the carbon through the soil

4. which farming practices do not help with the potential for a soil to act as a carbon sink

  • Tilling and Ploughing
  • using pesticides and fertilizing the soil
  • driving heavy machinery on the soil
  • allowing grazing on the soil

5. where does the soil store its nutrients

  • from air
  • from available water
  • from roots
  • from pores

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