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Soil Origin

Soil Origin. Is used to classify soils. One way to classify is to term soil organic or inorganic. Organic soils were derived from parent material that was at one time living. Inorganic soils were made up from parent materials that were of minerals or nonliving origin (matter).

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Soil Origin

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  1. Soil Origin • Is used to classify soils. • One way to classify is to term soil organic or inorganic. • Organic soils were derived from parent material that was at one time living. • Inorganic soils were made up from parent materials that were of minerals or nonliving origin (matter).

  2. How can or was soil deposited? • Fine soil particles like silt and clay deposited by wind = loess soils • Most of these were formed when glaciers melted and climatic conditions turned dry. • Sandy Soil deposited by wind = aeolian soils • Sand dunes • Saudi Arabian • Water- deposited soils = alluvial soil • Flood plain areas • Delta soils are an example.

  3. Soil Ph & NPK • What is soil fertility? • A fertile soil is one that provides soil nutrients. • Nutrients are elements needed for plant growth.

  4. Sedentary soils are those that remain in place and weather from bedrock.

  5. Nutrients are present in the soil in four forms: • Soil minerals • Organic matter • Absorbed nutrients • Dissolved ions ****NOT all nutrients in soil are available for uptake by the roots system of the plant

  6. Fertility • Is the measure of the plant-available nutrients in the soil.

  7. 16 Essential elements that are essential for healthy plant growth • Plants contain carbon, hydrogen, and oxygen from the air, while the remaining 13 elements are obtained from the soil.

  8. Macronutrients • Are those elements that are needed by plants in large quantities (amount.)

  9. Micronutrients • Are required by plants to a lesser degree/amount.

  10. 16 Essential plant nutrients C (carbon) H (hydrogen) From water & air O (oxygen) N (Nitrogen) P (Phosphorus) Macronutrients K (Potassium) Large amount

  11. Micronutrients (small amounts) • B (Boron) • Cu (Copper) • Cl (Chlorine) • Fe (Iron) • Mn (Manganese) • Mo (Molybdenum) • Zn (Zinc)

  12. Nitrogen • Easily leached from nitrogen cycle • Helps green color in chlorophyll • Deficiencies = reduced plant growth, yellowing of leaves • Toxicities: too much = spindly growth, darker than normal green color.

  13. Phosphorous • From nature (rocks) • Not easily leached • Helps seedling/ plant growth • Deficiency = poor root system, reduced growth, reduced flower, thin stems, purple foliage.

  14. Potassium • Mined as a rock • Can leach • Deficiency = nitrogen deficiency • Toxicity = reduced growth, marginal burn, scorched leaves, wilting, dead spots on leaves.

  15. Factors affecting nutrient availability • Soil ph can have a great affect on nutrient availability. • See over head

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