BIOL 1202 Chapter : Ch 37 Soil And Plant Nutrition
Document Summary
12:02 pm: concept 37. 1: soil contains a living complex ecosystem. In addition to climate, texture and composition of soil are major factors determining the distribution of plants: texture and composition of soils. Soil made up of particles derived from breakdown of rocks (minerals) along with organic material (humus: texture: relative amounts of various sizes of soil particles, composition: relative amounts of inorganic and organic components, soil horizons. To n2: two examples of plants with mutualistic relationships with other organisms. Symbiotic nitrogen fixation: mycorrhizae, bacteria and symbiotic nitrogen fixation. Symbiotic relationships with n-fixing bacteria provide some plants with a built-in source of fixed n (nh4: root nodules: swellings along the root that have been "infected" by the. Rhizobium bacteria: rhizobium convert n2 into ammonium (nh4) inside each root nodule, plant provides a low-o2 environment for n-fixation process, thick cell walls. Fungus gets a steady supply of sugar from the plant.
