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