Soil Chemistry

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Soil Chemistry

• Acidifying the soil or lowering the pH
• Elemental sulfur (effect is temporary)
• Ammonium sulfate (effect is temporary)
• Aluminum sulfate is also used but not recommended
  as aluminum is a heavy metal!

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Soil Chemistry

• Basic soils often can cause iron chlorosis in
  plants
• This can be corrected by acidifying the soil
• or choosing a plant which is tolerant of
• alkaline soils!
• Intervienal chlorosis often on
• acid-loving plants like roses, fruit trees,
• azaleas and rhododendrons

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Blue in acidic soils lt5.5 with available aluminum
Pink in neutral soils near pH of 7
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Soil Fertility

• 16 elements required for plant growth
• C HOPKNS CaFe Mg B Mn CuZn Mo Cl
• C. Hopkins Café managed by mine cousins Mo and
  Cleo

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Soil Fertility

• C, H, O from the atmosphere water
• Macronutrients N, P, K most often deficient in
  soils. Also, S, Ca, Mg
• Micronutrients Fe, B, Mn, Cu, Zn, Mo, Cl

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Soil Fertility
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Soil Fertility
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Soil Fertility
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Not fertility, excess light!
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Soil Fertility
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Soil Fertility
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Soil Fertility

• Organic fertilizers
• The only choice up until the 1940s
• Manure
• Fishmeal
• Seaweed
• Bloodmeal
• Bonemeal
• Cottonmeal
• Sewage sludge
• These often contain micronutrients

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