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Better Farming Series 04 - The Soil: How the Soil is Made up (FAO - INADES, 1976, 37 p.) (introduction...) Preface Plan of work Why we study the soil Different kinds of land (introduction...) The soil The subsoil The parent rock Examples of different soils What is soil made of ? (introduction...) Sand (introduction...) Sandy soils Clay (introduction...) Clay soils Silt (introduction...) Silty soils Humus (introduction...) What humus does Some practical advice Air in the soil Water in the soil (introduction...) Circulation of water in the soil Practical advice Living creatures in the soil Earthworms Rats and other animals Termites Other insects Microbes Suggested question paper