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Chapter 37
Plant Nutrition
Chapter 37
Plant Nutrition
Plants require certain chemicals
to complete their life cycle
Chapter 37
Plant Nutrition
Plants require certain chemicals
to complete their life cycle.
Macronutrients: required in
relatively large amounts
Chapter 37
Plant Nutrition
Plants require certain chemicals
to complete their life cycle.
Macronutrients: required in
relatively large amounts.
Micronutrients: required in very
small amounts
Chapter 37
Plant 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.)
Chapter 37
Plant Nutrition
How do we know if it’s essential?
Chapter 37
Plant Nutrition
How do we know if it’s essential?
Grow it hydroponically.
Chapter 37
Plant Nutrition
Macronutrients:
•Carbon
•Oxygen
•Hydrogen
•Nitrogen
•Phosphorus
•etc.
Chapter 37
Plant Nutrition
Macronutrients:
•Carbon
Deficiencies can
•Oxygen
cause symptoms
•Hydrogen
like stunted growth
or yellow leaves
•Nitrogen
•Phosphorus (chlorosis).
•etc.
Chapter 37
Plant Nutrition
Deficiencies of “mobile”
nutrients affect older parts of the
plant first.
Deficiencies of “immobile”
nutrients affect younger parts
first.
Chapter 37
Plant Nutrition
O2
CO2
H2O
O2
H2 O
CO2
Chapter 37
Plant Nutrition
Soil quality is a major
determinant of plant
growth.
Chapter 37
Plant Nutrition
Topsoil is:
•Broken up rock
•Living organisms
•Humus (decayed organic matter.)
Chapter 37
Plant Nutrition
Loam is the best kind of soil.
It is equal parts:
•Sand (big particles)
•Silt (intermediate particles)
•Clay (very fine particles.)
Chapter 37
Plant Nutrition
In a natural ecosystem, soil is
replenished by decomposing
dead organisms
Chapter 37
Plant Nutrition
In a natural ecosystem, soil is
replenished by decomposing
dead organisms.
On a farm, harvesting removes
nutrients.
Chapter 37
Plant Nutrition
Goals of soil conservation:
•Fertilize
•Irrigate
•Prevent erosion.
Chapter 37
Plant Nutrition
Goals of soil conservation:
•Fertilize
•Irrigate
•Prevent erosion.
Sustainability
Chapter 37
Plant Nutrition
Nitrogen is often the
mineral that has the
biggest impact on plant
growth.
Chapter 37
Plant Nutrition
Nitrogen-fixing bacteria convert N2 into
organic nitrogen compounds
Chapter 37
Plant Nutrition
Nitrogen-fixing bacteria convert N2 into
organic nitrogen compounds.
Nitrogen is essential for protein
synthesis
Chapter 37
Plant Nutrition
Nitrogen-fixing bacteria convert N2 into
organic nitrogen compounds.
Nitrogen is essential for protein
synthesis.
Rhizobium bacteria live symbiotically in
root nodules
Chapter 37
Plant 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.
Chapter 37
Plant Nutrition
Some plants are:
Chapter 37
Plant Nutrition
Some plants are:
•Epiphytes (grow on other plants)
Chapter 37
Plant Nutrition
Some plants are:
•Epiphytes (grow on other plants)
•Parasitic
Chapter 37
Plant Nutrition
Some plants are:
•Epiphytes (grow on other plants)
•Parasitic
•Carnivorous
Chapter 37
Plant Nutrition
Some plants are:
•Epiphytes (grow on other plants)
•Parasitic
•Carnivorous