Two common acids trap nitrogen in compost, cutting ammonia loss
Wang A, Chang R, Luo W, Li G, Li Y
Composting
If your compost pile smells like ammonia, you're literally watching nitrogen your plants need drift away as gas, and this simple acid trick keeps it in the pile where your tomatoes can use it.
When you compost vegetable scraps, a lot of the nitrogen that would otherwise feed your plants escapes into the air as smelly ammonia gas. Researchers found that adding citric acid and pyruvic acid together, two molecules your own cells use for energy, feeds microbes the extra fuel they need to grab that ammonia and lock it into stable compounds like glutamate instead of letting it float away. The result is compost with more nitrogen, more humus, and far less of that ammonia smell.
Key Findings
Citric acid and pyruvic acid amendments, alone or combined, reduced cumulative NH3 emissions by 60%-76% during composting
The combined treatment raised final glutamate content by 25.2% and humic substance content by 31.7% compared to untreated control
Improved nitrogen retention was linked to coordinated alpha-ketoglutarate and NADPH supply fueling the GDH and GS-GOGAT ammonium assimilation pathways, with bacteria tracking assimilation activity and fungi tracking precursor/reducing-power turnover
chevron_right Technical Summary
Adding two simple acids (citric and pyruvic acid) to vegetable waste compost cut stinky ammonia emissions by up to 76% and locked more nitrogen into the finished compost, making it richer in nutrients and humus.
Abstract Preview
Original paper
Complementary TCA cycle precursor supply enhances ammonia assimilation and nitrogen retention during vegetable waste composting.
Reactive nitrogen loss reduces nutrient recovery efficiency and the environmental performance of organic waste composting. Citric acid and pyruvic acid were evaluated separately and in combination ...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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