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