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SOILS

SOILS. ACIDITY AND TEMPERATURE OF SOIL Nekelle De Coteau 6B. What is soil. Soil is the mixture of broken rocks, minerals and living organisms and decaying organic matter called humus

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SOILS

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  1. SOILS ACIDITY AND TEMPERATURE OF SOIL Nekelle De Coteau 6B

  2. What is soil • Soil is the mixture of broken rocks, minerals and living organisms and decaying organic matter called humus • Soil is a natural body consisting of layers that are primarily composed of minerals which differ from their parent materials in their texture structure, and other characteristics.

  3. Images of Soils

  4. Soil Ph • Soil Ph is the measure of acidity or alkalinity in soil

  5. Acidic Soil • Soil is said to be acid when it is below 7 on the pH scale. • These soils can be very useful for cultivation as organic matter is broken down rapidly • Acidic soil is good for farming because it helps to release secondary minerals

  6. What contributes to acidic soil? • Rainfall • Fertilizer use • Plant root activity • Weathering of materials • Acid rain

  7. Alkaline soil • These are when the soil is above 6 on the pH scale • These soil have poor structure and low infiltration capacity • They have a hard calcareous layer

  8. Global variation in soil pH Red = acidic soil. Yellow = neutral soil. Blue = alkaline soil. Black = no data.

  9. Soil Temperatures • Soil temperature is the temperature measured near the surface of the soil • Soil with little vegetation happens to heat up more rapidly • This contributes to a warm “moist” soil and will have greater biota activity • This is because it gives rapid breakdown to organic matter

  10. Images of soils • Alkaline • Acidic

  11. References • Geography an Integrated Approach • Wikipedia.com • organicgardening.about.com

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