Wednesday, September 5

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Chapter 37Plant Nutrition
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Chapter 37Plant Nutrition

• Plants require certain chemicals to complete
  their life cycle

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Chapter 37Plant Nutrition

• Plants require certain chemicals to complete
  their life cycle.
• Macronutrients required in relatively large
  amounts

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Chapter 37Plant Nutrition

• Plants require certain chemicals to complete
  their life cycle.
• Macronutrients required in relatively large
  amounts.
• Micronutrients required in very small amounts

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Chapter 37Plant Nutrition

• Plants require certain chemicals to complete
  their life cycle.
• Macronutrients required in relatively large
  amounts.
• Micronutrients required in very small amounts.
  (Usually cofactors for enzymes.)

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Chapter 37Plant Nutrition

• How do we know if its essential?

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Chapter 37Plant Nutrition

• How do we know if its essential?
• Grow it hydroponically.

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Chapter 37Plant Nutrition

• Macronutrients

• Carbon
• Oxygen
• Hydrogen
• Nitrogen
• Phosphorus
• etc.

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Chapter 37Plant Nutrition

• Macronutrients

• Carbon
• Oxygen
• Hydrogen
• Nitrogen
• Phosphorus
• etc.

Deficiencies can cause symptoms like stunted
growth or yellow leaves (chlorosis).
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Chapter 37Plant Nutrition

• Deficiencies of mobile nutrients affect older
  parts of the plant first.
• Deficiencies of immobile nutrients affect
  younger parts first.

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Chapter 37Plant Nutrition

• O2
• CO2 H2O
• O2
  CO2
• H2O

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Chapter 37Plant Nutrition

• Soil quality is a major determinant of plant
  growth.

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Chapter 37Plant Nutrition

• Topsoil is
• Broken up rock
• Living organisms
• Humus (decayed organic matter.)

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Chapter 37Plant Nutrition

• Loam is the best kind of soil.
• It is equal parts
• Sand (big particles)
• Silt (intermediate particles)
• Clay (very fine particles.)

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Chapter 37Plant Nutrition

• In a natural ecosystem, soil is replenished by
  decomposing dead organisms

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Chapter 37Plant Nutrition

• In a natural ecosystem, soil is replenished by
  decomposing dead organisms.
• On a farm, harvesting removes nutrients.

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Chapter 37Plant Nutrition

• Goals of soil conservation

• Fertilize
• Irrigate
• Prevent erosion.

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Chapter 37Plant Nutrition

• Goals of soil conservation

• Fertilize
• Irrigate
• Prevent erosion.

Sustainability
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Chapter 37Plant Nutrition

• Nitrogen is often the mineral that has the
  biggest impact on plant growth.

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Chapter 37Plant Nutrition

• Nitrogen-fixing bacteria convert N2 into organic
  nitrogen compounds

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Chapter 37Plant Nutrition

• Nitrogen-fixing bacteria convert N2 into organic
  nitrogen compounds.
• Nitrogen is essential for protein synthesis

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Chapter 37Plant Nutrition

• Nitrogen-fixing bacteria convert N2 into organic
  nitrogen compounds.
• Nitrogen is essential for protein synthesis.
• Rhizobium bacteria live symbiotically in root
  nodules

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Chapter 37Plant Nutrition

• Nitrogen-fixing bacteria convert N2 into organic
  nitrogen compounds.
• Nitrogen is essential for protein synthesis.
• Rhizobium bacteria live symbiotically in root
  nodules.
• Mycorrhizae are fungi that do the same.

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Chapter 37Plant Nutrition

• Some plants are

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Chapter 37Plant Nutrition

• Some plants are

• Epiphytes (grow on other plants)

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Chapter 37Plant Nutrition

• Some plants are

• Epiphytes (grow on other plants)
• Parasitic

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Chapter 37Plant Nutrition

• Some plants are

• Epiphytes (grow on other plants)
• Parasitic
• Carnivorous

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Chapter 37Plant Nutrition

• Some plants are

• Epiphytes (grow on other plants)
• Parasitic
• Carnivorous