- Measure microbial transformations of carbon and nitrogen.
- Create and observe Winogradsky columns.
- Know the products of organic matter decomposition.
- Understand how the carbon to nitrogen ratio (C/N) of organic materials applied to soil influences the nitrogen availability for crops.
- Learn the carbon and nitrogen cycles.
- Explore soil organisms
GOAL: To understand the role of soil microorganisms in cycling of organic matter and nutrients.
- 10.1: Microbial Activity and the Carbon Cycle
- The solid portion of soil is composed of minerals and organic matter. The organic matter includes plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by the soil biota. Each of these contains many types of compounds including proteins, sugars, polysaccharides such as cellulose, hemicellulose, and starch, and complex fats, waxes, and lignins.
- 10.2: Humus
- Humus is the stable, amorphous, heterogeneous fraction of the soil organic matter remaining after the major portion of added plant and animal residues have decomposed. It is dark brown to black. It is bound to the surfaces of clays and hydrous oxides, which renders it resistant to microbial attack. The original source of the organic materials is not easily determined.
- Soil Ecology – what lies beneath https://www.nature.com/news/2008/081...l/455724a.html
- The Carbon Cycle – What goes around comes around https://www.visionlearning.com/en/li...arbon-Cycle/95
- Carbon cycle video by World Meteorological Organization: https://www.youtube.com/watch?v=E8Y6L5TI_94 (video length: 1:46)