Food Resources

Nitrogen Cycle

Phosphorous Cycle

Advantages

• These 2 nutrient cycles add fertilizers to the soil. (enhances plant growth—DNA, Protein, lipids)

• By adding nitrogen and phosphorous to crops, we can grow more crops, thus feed more people—growing human population

DisadvantagesEffects of Too Much Nitrogen and/or Phosphorous

Undernourishment

Due to poverty

Undernourishment

• In 1960 nearly 60% of the people living in developing countries were considered chronically undernourished.

• Today, despite the fact that their population has doubled over the past 40 years this number has fallen to less than 15 %.

• How is this possible? Advantage of fertilizers/pesticides

• What does that say about a change in carrying capacity?

Countries with Undernourishment

Malnourishment

anemia

Malnourishment

Marasmus—too little protein

Overnourishment

Imbalance of Food Distribution

• Stop here and do GLAD picture file cards of the comparison of commercial farms vs. subsistence farms.

Subsistence vs. Commercial Farming

• List inputs into system and outputs

• List inputs and outputs

• List inputs and outputs

• List inputs and outputs

• List inputs and outputs

• List inputs and outputs