Soil Nutrients and Health of Pacific Madrone Marianne Elliott ESC 515 Spring 2000

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

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

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.

Soil pH

Cation Exchange Capacity

Available Nitrogen

C:N ratio

Macronutrients

Micronutrients

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.