Elements of the Nature and Properties of Soils
This book opens readers' eyes to the fascinating and important world of soils, and the principles that can be used to minimize the degradation and destruction of one of our most important natural resources. KEY TOPICS Concentrating on essentials, this edition is a more concise version of its parent book, The Nature and Properties of Soils, maintaining its high standards of rigor and readability, and its priority of explaining this science in a manner relevant to many fields of study. It provides a fundamental knowledge that is a prerequisite to meeting the many natural-resource challenges awaiting humanity in the 21st century. For individuals who study the science of soil, and those who make a profession of it.
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THE SOILS AROUND Us I
or Sous FROM PARENT MATERIALS
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acid soils activity adsorbed aeration aggregates agricultural aluminum amount anions areas atmosphere bacteria bulk density calcium capacity carbon cation exchange cation exchange capacity chemical colloids compost compounds crop cycle decomposition drainage earthworms ecosystems effect fertilizer Figure ﬂow forest fungi groundwater Histosols horizons humid humus increase inﬂuence inorganic ions irrigation kaolinite layer leaching levels loam manure microbial micronutrients microorganisms mineral moisture Mollisols mulch mycorrhizae nematodes nitrate nitrogen oxides oxygen parent material particles phosphorus Photo courtesy plant growth plant residues plant roots pore space potassium processes production reactions redox reduced regions saline salts sand sandy saturated Section silicate clays silt smectite soil colloids soil organic matter soil pH soil profile soil solution soil surface soil temperature soil water soluble species structure sulfate sulfur texture tillage toxic Ultisols uptake vegetation water potential water table weathering wetland zone