Soil Part 1 - Principles
by See Title Page
part of the Yearbook of Agriculture Series


Table of Contents


Principles
We Seek; We Learn
The Basis of Fertility
What Soils Are
Physical Properties
Growth of Plants
Soil Moisture
Use of Moisture by Plants
pH, Soil Acidity, and Plant Growth
The Chemistry of Soil pH
Fertility
Plant Nutrition and Soil Fertility
Nitrogen and Soil Fertility
Soil Phosphorus and Fertility
Soil Potassium and Fertility
Sulfur and Soil Fertility
Iron and Soil Fertility
Zinc and Soil Fertility
Boron and Soil Fertility
Copper and Soil Fertility
Manganese and Soil Fertility
Trace Elements
Organic Matter
Living Organisms in the Soil
Toxic Elements in Soils