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Soils, Crops and Fertilizer Use
Chapter 1: Down to earth - Some Important Soil Basics
What is soil, anyway?
Why do soils vary so much?
Topsoil vs. subsoil
The mineral side of soil: sand, silt, and clay
Distinguishing "tropical" soils from "temperate" soils
Organic matter - a soil's best friend
The role of soil microorganisms
Chapter 1: Down to earth - Some Important Soil Basics
