Transcription of CHAPTER 1. SOIL PHYSICAL PROPERTIES
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CHAPTER 1. SOIL PHYSICAL PROPERTIES
SSC107-Fall 2000 CHAPTER 1, Page - 1 - CHAPTER 1. SOIL PHYSICAL PROPERTIESC ontents: Soil physics Soil texture Soil surface area Soil structure Volume and mass relationships Water content measurements UnitsSOIL PHYSICS: THE STUDY OF THE STATE AND TRANSPORT OF ALL FORM OFMATTER AND ENERGY IN SOILSJ Why study soil physics ???ATMOSPHEREROOTZONESOIL SURFACEVADOSE ZONE CROPSSTREAMGROUNDWATERSOILS: SOURCE OF NUTRIENTS AND WATER FOR CROP AND PLANT GROWTH CONDUIT BETWEEN SOIL SURFACE AND GROUNDWATER ACT AS FILTER AND A BUFFERSSC107-Fall 2000 CHAPTER 1, Page - 2 -Soils are extremely complex, hence we often simplify to study and understand soil physicalprinciples, , soil particles are spherical soil pores are composed of capillary tubes soil is homogeneoussoil particlessoil gassoil waterSOIL SOLID PHASE IS CHARACTERIZED BY SOIL TEXTURE - SIZE DISTRIBUTION OF SOIL PARTICLES chemical AND MINERALOGICAL PROPERTIES SHAPE AND SURFA
Surface area of soil affects its physical and chemical properties and is largely determined by amount of clay present in soil: Specific surface area of soil particles Effective Area Specific Surface Area Particle Diameter (cm) Mass (g) (cm2) (cm2 g-1) Gravel 2 x 10-1 1.13 x 10-2 1.3 x 10-1 11.1 Sand 5 x 10-3 1.77 x 10-7 7.9 x 10-5 444.4
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