Comparison of Soils and Leaves of Pacific Madrone and Their Relationship to Plant Pathology A.B. Adams and Rand Knight

Introduction

Objective of Study To determine what soil series grow Pacific madrone To determine nutrient variability of these soils and madrone leaves To determine if soil structure and nutrients (pools and available) are related to plant pathology

Hypotheses Ho:Plant pathology and nutrients do not vary as a function of soil structure and nutrients

Variation in Madrone Leaves as a Function of: Seasonal variation within a healthy tree branch Annual variation within a healthy tree branch Variation between trees within a site Variation between sites of various soil series Variation associated with health or disease status of trees

Healthy tree micronutrient phenological variation of leaves B and Ni vary due to detection limits set with ICP Fe is higher in all ages, but varies as does Cu Zn and Mn are stable at all levels Mo was not detected

Annual macronutrient variation in leaves on a healthy tree (GSC) Ca increases, the others decrease with time Mobile elements are highest in youngest leaves K is highest in young leaves

Annual micronutrient variation in leaves on a healthy tree (GSC) Micronutrients increase or remain constant with on an annual basis Fe, B and Zn are higher than Cu, Mn Mo and Ni Cu levels are constant

C levels are established and maintained, N decreases with time

Variation in Soils Successional trends from Fort Lewis Variation associated with series and structure

Available Nutrients Cation exchange variation with series Cation exchange associated with a soil profile at a site with healthy trees (Arroyos)

Conclusions