Soil ScienceDavid M Vaughan Certified Arborist TX 0118

Etter Tree CareSan Antonio Arborist Association

ISA Texas Chapter

Dr. Seuss and the Soil Food Web

Your first introduction to the soil food web may have been through the good Doctor.

Micro-organisms in SoilTablespoon of soil has 6 billion microbes.

75,000 species of bacteria25,000 species of fungi1,000 species protozoa

100 species nematodes.

Micro-organisms In Soil

Soil Food Web

.RhizosphereNUTRIENT CYCLINGHUMUS

MYCORRHIZAEMINERALIZATION

Mycorrhizae

Fungal Snare Trap

SOIL STRUCTURE

Soil Particle Sizes

Soil Particle Surface Area

pH Scale

Compaction Forces

Water Infiltration

Sources: The Nature and Properties of Soils

• Nyle Brady and Ray Weil ISA Arborists’ Certification Study Guide

• Sharon Lily Arboriculture

• Richard Harris, James Clark, and Nelda Matheny Up By Roots

• James Urban The Soil Will Save Us

• Kristin Ohlson

David M. Vaughan Certified Arborist

TX Etter Tree Care San Antonio

Arborist Association

pH For coffee it’s 5, for tomatoes it’s 4; While household ammonia’s 11 or more. It’s 7 for water, if in a pure state. But rainwater’s 6 and sea water is 8. It’s basic at 10, quite acidic at 2 And well above 7 when litmus turns blue. Some find it a puzzlement. Doubtless their

fog Has something to do with that negative log. Dorris Kolb