ANT214H5 Lecture Notes - Lecture 8: Power Machines, Rhizosphere, Soil Acidification
Document Summary
Hunter/gatherers - egalitarian people which means they believe in equality and help each other get food. Agricultural - horticulture which is garden cultivation and management. Gardening - simple technology, human labor, rain for irrigation. Emergence of class producers - transfer surplus to dominant group. Increased vulnerabilities to pathogens and soil nutrient deficiencies. From crop rotations to manure ammonia based fertilizers. Natural pest control synthetic herbicides and pesticides. Large quantities of fossil fuels to produce pesticides and power machines that apply them. 1 gram soil = 100 000 cells of 600-3800 difference species. Symbiotic relationships between bacteria, fungi and animals. Plant excretes carbs, glucose and proteins that feed bacteria. Mycorrhizae facilitate communication and transport between plants. Bridge connections - 80% of terrestrial plant communities. Holds more water= prevents nutrients leaching out and less irrigation required. Sequesters carbon dioxide, offsets emissions by 5-15% Soil degraded at 10-40x rate of replenishment. 10/12 most dangerous organic chemicals are pesticides.
