MC 2000 Chapter : MC2001 Agenda Setting Theory
Document Summary
Concept 37. 1 soil contains a living complex ecosystem distribution of plats. In addition to climate, texture and composition of soil are major factors determining the. Soil is made up of particles derived from the breakdown of rocks (minerals) along with organic material (humus) Texture: the relative amounts of carious sized of soils particles. Composition: relative amounts of inorganic and organic components. Soil horizons are visible in vertical profile. A horizon is a mix of humus and minerals: humus consists of decomposing organic material, prevents packing of smaller mineral particles and allows retention of water. After rains, smaller soaves in the soil retain water because of h-bonding with clay and other particles. Film of loosely bound water is available to plant roots. Not all the soil water can be extracted by the plant. May cations are attracted to negatively charged soil particles.
