The strong odor of ammonia is due to the process of Ammonification.
Composting involves the recycling of the garden and also the kitchen waste to nutrient rich manure for plants. Ammonification can be defined as the process, by which nitrogen ,which is present in organic compounds can also be found in organisms' wastes is recycle or by decomposing of the microorganisms by nature with time gradually .
It involves the formation of ammonium ions (or ammonia) from the organic nitrogen. As Kate is try to performing the composting and also she notices that the strong smell of ammonia is comming, so the process taking place in composting bin is ammonification.
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