Carbon and Nitrogen Cycles

This educational video offers a clear, introductory explanation of the carbon and nitrogen cycles, with direct relevance to composting and soil biology. It shows how nitrogen moves through ecosystems via fixation, nitrification, ammonification, and denitrification, and it links these processes to plant uptake and decomposition. The video explains that nitrogen-fixing bacteria in root systems can convert nitrogen into ammonia and ammonium, which plants can use, and that nitrifying bacteria in the soil can convert ammonium into nitrates and nitrites, which are also plant-available forms. It then describes how decomposers return ammonia to the soil during ammonification when plants and animals break down, closing the nutrient loop. The video also explains that denitrifying bacteria can convert nitrates and nitrites back into atmospheric nitrogen gas, illustrating how nitrogen can be lost from soil systems. Its main value is conceptual clarity: it helps viewers visualize the nitrogen cycle as an interconnected biological process rather than a set of isolated chemical reactions. For educators, beginner farmers, or homesteaders trying to understand why compost influences fertility, this source provides a strong foundational framework. It is not a technical composting manual, and it does not go deeply into compost recipe design or field application rates, but it does connect the nitrogen cycle to the biological activity that underlies compost and soil function. As a result, it is useful for building intuition about why compost, microbial activity, and nutrient cycling are inseparable in healthy soils.