IDSB02H3 Lecture Notes - Lecture 3: Cation-Exchange Capacity, Soil Fertility, Soil Classification
18 Mar 2017
School
Department
Course
Professor
Document Summary
Idsb02: lecture 3 - soils and food security. Soil science and the classification of soil. Results in a major loss in soils globally. The 1st wave of soil erosion began with the mechanized use of the plow. Civilizations expanded away from alluvial soils into forested slopes. The 2nd wave was with the green evolution, 16th to 19th century. The 3rd wave is 1945 and onwards with new frontiers in tropical rainforests. compaction. Soil management needs to deal with depletion, erosion, salinization, and. Solutions include terraces, shifting cultivation with long fallows and rotational. Use of nutrients and manure, as well as allowing for fallow periods. The addition of nitrogen fixing plants through intercropping. crops. The historical development of soil knowledge" has led to classification systems: The creation of soils: the mineral weathering of rocks. environment. Physical weathering: is the weathering of soils, rocks, and minerals by the. Chemical weathering: is the erosion and disintegration of rocks caused by chemical.
