Pore spaces are the voids between the soil particles. Look at and draw a soil profile. Basic Components The four main components of soil are rocks (minerals), water, air and organic material (leaves and decomposed animals, for example). Soil that is classified as clay, for example, contains more water than light, sandy soils. Soil is the loose, weathered material on Earth's surface in which plants can grow. Critical soil functions include the ability to support plant growth and productivity, nutrient cycling, and water partitioning. Composition of Soil Soils have four major components: (a) mineral matter, (b) organic matter, (c) air, and (d) water. In general, soil contains 40-45% inorganic matter, 5% organic matter, 25% water, and 25% air. In order to sustain plant life, the proper mix of air, water, minerals, and organic material is required. A soil profile is the sequence of natural layers, or horizons, in a soil. Each soil series consists of soils having major horizons that are similar in color, texture, structure, reaction, consistency, mineral and chemical composition, and arrangement in the soil profile. Soil composition is a mix of soil ingredients that varies from place to place. The composition of the components inside soil varies to create different soil types. 4. Discussing how soil is formed and why it is important to look after it. Agronomy 105 Soil & Water: Basic Soil Properties 4 Soil Descriptors •Texture: Relative proportion of sand, silt, and clay in the soil •Structure: Forms the soil takes as particles clump together •Peds: Structural units of soil •Bulk Density: A soil’s weight per volume •Horizon: Layer of soil with somewhat uniform color, texture, and structure SOIL Soil Taxonomy definition: Collection of natural bodies of the earth’s surface, in places modified or even made by man or earthy materials, containing living matter and supporting or capable of supporting plants out of doors. Soil quality can affect plant establishment and vigor, community composition, and colonization of invasive species. Find answers to questions on the web. The chemical composition of the soil, the topography, and the presence of living organisms determines the quality of soil. Fig. Soil is the outer, loose layer that covers the surface of Earth. Discuss erosion. The clay fraction, because of its high surface area, is the most active part of the soil controlling many of the chemical and physical properties of the soil. 2. The sand and silt fractions i influence mainly the physical properties of the soil. Soil profile gallery Soil Profile Gallery. Soil is constantly being formed wherever bedrock is exposed. Soil profile. It is the seat of soil fertility. Closely observe a soil sample and record what is found. Transcript Soil Formation and Composition PPT Soil Formation and Composition Soil Formation 1. Air and/or water occupy approximately half the volume of soil… Soil Quality is defined as the soil’s capacity to function. Soil forms as rock is broken down by weathering and mixes with other materials on the surface. Soil Composition. Its upper limit is air or shallow water and its lower limit is the depth to which soil weathering has been effective. 1.2. 3. 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