soil science by david m vaughn
TRANSCRIPT
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