Soil Nutrients and Health of Pacific Madrone

1
Soil Nutrients and Health of Pacific Madrone

• Marianne Elliott
• ESC 515
• Spring 2000

2
Healthy Tree

• Full crown
• Parking lot behind Burke Museum
• Flat
• Dry, low humidity
• Shrubs

3
Unhealthy Tree

• Heavily diseased
• Seward Park
• Lawn
• Slope
• Waterlogged soil
• Evidence of root rot on nearby trees

4
Are there differences in soil and foliar
nutrients in sick and healthy madrones?
Unbalanced nutrition, especially high N
concentrations, may make them susceptible to
fungal pathogens and insect pests.
5
Soil pH
6
Cation Exchange Capacity
7
Available Nitrogen
8
CN ratio
9
Macronutrients
10
Micronutrients
11
Conclusions

• There are differences in nutrients between the
  sick and healthy tree.
• The sick tree had a higher proportion of N than
  the healthy tree.
• There were fewer available nutrients in the soil
  near the sick tree.